/* Target-dependent code for GDB, the GNU debugger.
- Copyright 2001 Free Software Foundation, Inc.
+
+ Copyright 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+
Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
for IBM Deutschland Entwicklung GmbH, IBM Corporation.
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
-#define S390_TDEP /* for special macros in tm-s390.h */
-#include <defs.h>
+#include "defs.h"
#include "arch-utils.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "gdbcmd.h"
-#include "symfile.h"
#include "objfiles.h"
#include "tm.h"
#include "../bfd/bfd.h"
#include "floatformat.h"
#include "regcache.h"
+#include "reggroups.h"
+#include "regset.h"
#include "value.h"
#include "gdb_assert.h"
+#include "dis-asm.h"
+#include "s390-tdep.h"
+/* The tdep structure. */
-/* Number of bytes of storage in the actual machine representation
- for register N. */
-int
-s390_register_raw_size (int reg_nr)
+struct gdbarch_tdep
{
- if (S390_FP0_REGNUM <= reg_nr
- && reg_nr < S390_FP0_REGNUM + S390_NUM_FPRS)
- return S390_FPR_SIZE;
- else
- return 4;
+ /* ABI version. */
+ enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;
+
+ /* Core file register sets. */
+ const struct regset *gregset;
+ int sizeof_gregset;
+
+ const struct regset *fpregset;
+ int sizeof_fpregset;
+};
+
+
+/* Register information. */
+
+struct s390_register_info
+{
+ char *name;
+ struct type **type;
+};
+
+static struct s390_register_info s390_register_info[S390_NUM_TOTAL_REGS] =
+{
+ /* Program Status Word. */
+ { "pswm", &builtin_type_long },
+ { "pswa", &builtin_type_long },
+
+ /* General Purpose Registers. */
+ { "r0", &builtin_type_long },
+ { "r1", &builtin_type_long },
+ { "r2", &builtin_type_long },
+ { "r3", &builtin_type_long },
+ { "r4", &builtin_type_long },
+ { "r5", &builtin_type_long },
+ { "r6", &builtin_type_long },
+ { "r7", &builtin_type_long },
+ { "r8", &builtin_type_long },
+ { "r9", &builtin_type_long },
+ { "r10", &builtin_type_long },
+ { "r11", &builtin_type_long },
+ { "r12", &builtin_type_long },
+ { "r13", &builtin_type_long },
+ { "r14", &builtin_type_long },
+ { "r15", &builtin_type_long },
+
+ /* Access Registers. */
+ { "acr0", &builtin_type_int },
+ { "acr1", &builtin_type_int },
+ { "acr2", &builtin_type_int },
+ { "acr3", &builtin_type_int },
+ { "acr4", &builtin_type_int },
+ { "acr5", &builtin_type_int },
+ { "acr6", &builtin_type_int },
+ { "acr7", &builtin_type_int },
+ { "acr8", &builtin_type_int },
+ { "acr9", &builtin_type_int },
+ { "acr10", &builtin_type_int },
+ { "acr11", &builtin_type_int },
+ { "acr12", &builtin_type_int },
+ { "acr13", &builtin_type_int },
+ { "acr14", &builtin_type_int },
+ { "acr15", &builtin_type_int },
+
+ /* Floating Point Control Word. */
+ { "fpc", &builtin_type_int },
+
+ /* Floating Point Registers. */
+ { "f0", &builtin_type_double },
+ { "f1", &builtin_type_double },
+ { "f2", &builtin_type_double },
+ { "f3", &builtin_type_double },
+ { "f4", &builtin_type_double },
+ { "f5", &builtin_type_double },
+ { "f6", &builtin_type_double },
+ { "f7", &builtin_type_double },
+ { "f8", &builtin_type_double },
+ { "f9", &builtin_type_double },
+ { "f10", &builtin_type_double },
+ { "f11", &builtin_type_double },
+ { "f12", &builtin_type_double },
+ { "f13", &builtin_type_double },
+ { "f14", &builtin_type_double },
+ { "f15", &builtin_type_double },
+
+ /* Pseudo registers. */
+ { "pc", &builtin_type_void_func_ptr },
+ { "cc", &builtin_type_int },
+};
+
+/* Return the name of register REGNUM. */
+static const char *
+s390_register_name (int regnum)
+{
+ gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+ return s390_register_info[regnum].name;
}
-int
-s390x_register_raw_size (int reg_nr)
+/* Return the GDB type object for the "standard" data type of data in
+ register REGNUM. */
+static struct type *
+s390_register_type (struct gdbarch *gdbarch, int regnum)
{
- return (reg_nr == S390_FPC_REGNUM)
- || (reg_nr >= S390_FIRST_ACR && reg_nr <= S390_LAST_ACR) ? 4 : 8;
+ gdb_assert (regnum >= 0 && regnum < S390_NUM_TOTAL_REGS);
+ return *s390_register_info[regnum].type;
}
-int
-s390_cannot_fetch_register (int regno)
+/* DWARF Register Mapping. */
+
+static int s390_dwarf_regmap[] =
+{
+ /* General Purpose Registers. */
+ S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
+ S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
+ S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
+ S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
+
+ /* Floating Point Registers. */
+ S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
+ S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
+ S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
+ S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
+
+ /* Control Registers (not mapped). */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+
+ /* Access Registers. */
+ S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
+ S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
+ S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
+ S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
+
+ /* Program Status Word. */
+ S390_PSWM_REGNUM,
+ S390_PSWA_REGNUM
+};
+
+/* Convert DWARF register number REG to the appropriate register
+ number used by GDB. */
+static int
+s390_dwarf_reg_to_regnum (int reg)
{
- return (regno >= S390_FIRST_CR && regno < (S390_FIRST_CR + 9)) ||
- (regno >= (S390_FIRST_CR + 12) && regno <= S390_LAST_CR);
+ int regnum = -1;
+
+ if (reg >= 0 || reg < ARRAY_SIZE (s390_dwarf_regmap))
+ regnum = s390_dwarf_regmap[reg];
+
+ if (regnum == -1)
+ warning ("Unmapped DWARF Register #%d encountered\n", reg);
+
+ return regnum;
}
-int
-s390_register_byte (int reg_nr)
+/* Pseudo registers - PC and condition code. */
+
+static void
+s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, void *buf)
{
- if (reg_nr <= S390_GP_LAST_REGNUM)
- return reg_nr * S390_GPR_SIZE;
- if (reg_nr <= S390_LAST_ACR)
- return S390_ACR0_OFFSET + (((reg_nr) - S390_FIRST_ACR) * S390_ACR_SIZE);
- if (reg_nr <= S390_LAST_CR)
- return S390_CR0_OFFSET + (((reg_nr) - S390_FIRST_CR) * S390_CR_SIZE);
- if (reg_nr == S390_FPC_REGNUM)
- return S390_FPC_OFFSET;
- else
- return S390_FP0_OFFSET + (((reg_nr) - S390_FP0_REGNUM) * S390_FPR_SIZE);
+ ULONGEST val;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
+ store_unsigned_integer (buf, 4, val & 0x7fffffff);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 12) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "invalid regnum");
+ }
+}
+
+static void
+s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const void *buf)
+{
+ ULONGEST val, psw;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
+ psw = (psw & 0x80000000) | (val & 0x7fffffff);
+ regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, psw);
+ break;
+
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "invalid regnum");
+ }
+}
+
+static void
+s390x_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, void *buf)
+{
+ ULONGEST val;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_read (regcache, S390_PSWA_REGNUM, buf);
+ break;
+
+ case S390_CC_REGNUM:
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
+ store_unsigned_integer (buf, 4, (val >> 44) & 3);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "invalid regnum");
+ }
+}
+
+static void
+s390x_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
+ int regnum, const void *buf)
+{
+ ULONGEST val, psw;
+
+ switch (regnum)
+ {
+ case S390_PC_REGNUM:
+ regcache_raw_write (regcache, S390_PSWA_REGNUM, buf);
+ break;
+
+ case S390_CC_REGNUM:
+ val = extract_unsigned_integer (buf, 4);
+ regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
+ psw = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
+ regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, psw);
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__, "invalid regnum");
+ }
+}
+
+/* 'float' values are stored in the upper half of floating-point
+ registers, even though we are otherwise a big-endian platform. */
+
+static int
+s390_convert_register_p (int regno, struct type *type)
+{
+ return (regno >= S390_F0_REGNUM && regno <= S390_F15_REGNUM)
+ && TYPE_LENGTH (type) < 8;
+}
+
+static void
+s390_register_to_value (struct frame_info *frame, int regnum,
+ struct type *valtype, void *out)
+{
+ char in[8];
+ int len = TYPE_LENGTH (valtype);
+ gdb_assert (len < 8);
+
+ get_frame_register (frame, regnum, in);
+ memcpy (out, in, len);
+}
+
+static void
+s390_value_to_register (struct frame_info *frame, int regnum,
+ struct type *valtype, const void *in)
+{
+ char out[8];
+ int len = TYPE_LENGTH (valtype);
+ gdb_assert (len < 8);
+
+ memset (out, 0, 8);
+ memcpy (out, in, len);
+ put_frame_register (frame, regnum, out);
+}
+
+/* Register groups. */
+
+static int
+s390_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Registers displayed via 'info regs'. */
+ if (group == general_reggroup)
+ return (regnum >= S390_R0_REGNUM && regnum <= S390_R15_REGNUM)
+ || regnum == S390_PC_REGNUM
+ || regnum == S390_CC_REGNUM;
+
+ /* Registers displayed via 'info float'. */
+ if (group == float_reggroup)
+ return (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM)
+ || regnum == S390_FPC_REGNUM;
+
+ /* Registers that need to be saved/restored in order to
+ push or pop frames. */
+ if (group == save_reggroup || group == restore_reggroup)
+ return regnum != S390_PSWM_REGNUM && regnum != S390_PSWA_REGNUM;
+
+ return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
+
+/* Core file register sets. */
+
+int s390_regmap_gregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ 0x00, 0x04,
+ /* General Purpose Registers. */
+ 0x08, 0x0c, 0x10, 0x14,
+ 0x18, 0x1c, 0x20, 0x24,
+ 0x28, 0x2c, 0x30, 0x34,
+ 0x38, 0x3c, 0x40, 0x44,
+ /* Access Registers. */
+ 0x48, 0x4c, 0x50, 0x54,
+ 0x58, 0x5c, 0x60, 0x64,
+ 0x68, 0x6c, 0x70, 0x74,
+ 0x78, 0x7c, 0x80, 0x84,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390x_regmap_gregset[S390_NUM_REGS] =
+{
+ 0x00, 0x08,
+ /* General Purpose Registers. */
+ 0x10, 0x18, 0x20, 0x28,
+ 0x30, 0x38, 0x40, 0x48,
+ 0x50, 0x58, 0x60, 0x68,
+ 0x70, 0x78, 0x80, 0x88,
+ /* Access Registers. */
+ 0x90, 0x94, 0x98, 0x9c,
+ 0xa0, 0xa4, 0xa8, 0xac,
+ 0xb0, 0xb4, 0xb8, 0xbc,
+ 0xc0, 0xc4, 0xc8, 0xcc,
+ /* Floating Point Control Word. */
+ -1,
+ /* Floating Point Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+};
+
+int s390_regmap_fpregset[S390_NUM_REGS] =
+{
+ /* Program Status Word. */
+ -1, -1,
+ /* General Purpose Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Access Registers. */
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ -1, -1, -1, -1, -1, -1, -1, -1,
+ /* Floating Point Control Word. */
+ 0x00,
+ /* Floating Point Registers. */
+ 0x08, 0x10, 0x18, 0x20,
+ 0x28, 0x30, 0x38, 0x40,
+ 0x48, 0x50, 0x58, 0x60,
+ 0x68, 0x70, 0x78, 0x80,
+};
+
+/* Supply register REGNUM from the register set REGSET to register cache
+ REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
+static void
+s390_supply_regset (const struct regset *regset, struct regcache *regcache,
+ int regnum, const void *regs, size_t len)
+{
+ const int *offset = regset->descr;
+ int i;
+
+ for (i = 0; i < S390_NUM_REGS; i++)
+ {
+ if ((regnum == i || regnum == -1) && offset[i] != -1)
+ regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);
+ }
}
-#ifndef GDBSERVER
+static const struct regset s390_gregset = {
+ s390_regmap_gregset,
+ s390_supply_regset
+};
+
+static const struct regset s390x_gregset = {
+ s390x_regmap_gregset,
+ s390_supply_regset
+};
+
+static const struct regset s390_fpregset = {
+ s390_regmap_fpregset,
+ s390_supply_regset
+};
+
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
+const struct regset *
+s390_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ if (strcmp (sect_name, ".reg") == 0 && sect_size == tdep->sizeof_gregset)
+ return tdep->gregset;
+
+ if (strcmp (sect_name, ".reg2") == 0 && sect_size == tdep->sizeof_fpregset)
+ return tdep->fpregset;
+
+ return NULL;
+}
+
+
+#define GDB_TARGET_IS_ESAME (TARGET_ARCHITECTURE->mach == bfd_mach_s390_64)
+#define S390_GPR_SIZE (GDB_TARGET_IS_ESAME ? 8 : 4)
+#define S390_FPR_SIZE (8)
#define S390_MAX_INSTR_SIZE (6)
#define S390_SYSCALL_OPCODE (0x0a)
#define S390_SYSCALL_SIZE (2)
#define S390X_SIGREGS_FP0_OFFSET (216)
#define S390_UC_MCONTEXT_OFFSET (256)
#define S390X_UC_MCONTEXT_OFFSET (344)
-#define S390_STACK_FRAME_OVERHEAD (GDB_TARGET_IS_ESAME ? 160:96)
#define S390_SIGNAL_FRAMESIZE (GDB_TARGET_IS_ESAME ? 160:96)
#define s390_NR_sigreturn 119
#define s390_NR_rt_sigreturn 173
CORE_ADDR sig_fixed_saved_pc_valid;
CORE_ADDR sig_fixed_saved_pc;
CORE_ADDR frame_pointer_saved_pc; /* frame pointer needed for alloca */
+ CORE_ADDR stack_bought_valid;
CORE_ADDR stack_bought; /* amount we decrement the stack pointer by */
CORE_ADDR sigcontext;
};
static CORE_ADDR s390_frame_saved_pc_nofix (struct frame_info *fi);
-int
-s390_readinstruction (bfd_byte instr[], CORE_ADDR at,
- struct disassemble_info *info)
+static int
+s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
{
int instrlen;
4,
6
};
- if ((*info->read_memory_func) (at, &instr[0], 2, info))
+ if (target_read_memory (at, &instr[0], 2))
return -1;
instrlen = s390_instrlen[instr[0] >> 6];
- if ((*info->read_memory_func) (at + 2, &instr[2], instrlen - 2, info))
- return -1;
+ if (instrlen > 2)
+ {
+ if (target_read_memory (at + 2, &instr[2], instrlen - 2))
+ return -1;
+ }
return instrlen;
}
}
+/* Prologue analysis. */
+
+/* When we analyze a prologue, we're really doing 'abstract
+ interpretation' or 'pseudo-evaluation': running the function's code
+ in simulation, but using conservative approximations of the values
+ it would have when it actually runs. For example, if our function
+ starts with the instruction:
+
+ ahi r1, 42 # add halfword immediate 42 to r1
+
+ we don't know exactly what value will be in r1 after executing this
+ instruction, but we do know it'll be 42 greater than its original
+ value.
+
+ If we then see an instruction like:
+
+ ahi r1, 22 # add halfword immediate 22 to r1
+
+ we still don't know what r1's value is, but again, we can say it is
+ now 64 greater than its original value.
+
+ If the next instruction were:
+
+ lr r2, r1 # set r2 to r1's value
+
+ then we can say that r2's value is now the original value of r1
+ plus 64. And so on.
+
+ Of course, this can only go so far before it gets unreasonable. If
+ we wanted to be able to say anything about the value of r1 after
+ the instruction:
+
+ xr r1, r3 # exclusive-or r1 and r3, place result in r1
+
+ then things would get pretty complex. But remember, we're just
+ doing a conservative approximation; if exclusive-or instructions
+ aren't relevant to prologues, we can just say r1's value is now
+ 'unknown'. We can ignore things that are too complex, if that loss
+ of information is acceptable for our application.
+
+ Once you've reached an instruction that you don't know how to
+ simulate, you stop. Now you examine the state of the registers and
+ stack slots you've kept track of. For example:
+
+ - To see how large your stack frame is, just check the value of sp;
+ if it's the original value of sp minus a constant, then that
+ constant is the stack frame's size. If the sp's value has been
+ marked as 'unknown', then that means the prologue has done
+ something too complex for us to track, and we don't know the
+ frame size.
+
+ - To see whether we've saved the SP in the current frame's back
+ chain slot, we just check whether the current value of the back
+ chain stack slot is the original value of the sp.
-char *
-s390_register_name (int reg_nr)
+ Sure, this takes some work. But prologue analyzers aren't
+ quick-and-simple pattern patching to recognize a few fixed prologue
+ forms any more; they're big, hairy functions. Along with inferior
+ function calls, prologue analysis accounts for a substantial
+ portion of the time needed to stabilize a GDB port. So I think
+ it's worthwhile to look for an approach that will be easier to
+ understand and maintain. In the approach used here:
+
+ - It's easier to see that the analyzer is correct: you just see
+ whether the analyzer properly (albiet conservatively) simulates
+ the effect of each instruction.
+
+ - It's easier to extend the analyzer: you can add support for new
+ instructions, and know that you haven't broken anything that
+ wasn't already broken before.
+
+ - It's orthogonal: to gather new information, you don't need to
+ complicate the code for each instruction. As long as your domain
+ of conservative values is already detailed enough to tell you
+ what you need, then all the existing instruction simulations are
+ already gathering the right data for you.
+
+ A 'struct prologue_value' is a conservative approximation of the
+ real value the register or stack slot will have. */
+
+struct prologue_value {
+
+ /* What sort of value is this? This determines the interpretation
+ of subsequent fields. */
+ enum {
+
+ /* We don't know anything about the value. This is also used for
+ values we could have kept track of, when doing so would have
+ been too complex and we don't want to bother. The bottom of
+ our lattice. */
+ pv_unknown,
+
+ /* A known constant. K is its value. */
+ pv_constant,
+
+ /* The value that register REG originally had *UPON ENTRY TO THE
+ FUNCTION*, plus K. If K is zero, this means, obviously, just
+ the value REG had upon entry to the function. REG is a GDB
+ register number. Before we start interpreting, we initialize
+ every register R to { pv_register, R, 0 }. */
+ pv_register,
+
+ } kind;
+
+ /* The meanings of the following fields depend on 'kind'; see the
+ comments for the specific 'kind' values. */
+ int reg;
+ CORE_ADDR k;
+};
+
+
+/* Set V to be unknown. */
+static void
+pv_set_to_unknown (struct prologue_value *v)
{
- static char *register_names[] = {
- "pswm", "pswa",
- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
- "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
- "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15",
- "cr0", "cr1", "cr2", "cr3", "cr4", "cr5", "cr6", "cr7",
- "cr8", "cr9", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15",
- "fpc",
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
- };
+ v->kind = pv_unknown;
+}
- if (reg_nr >= S390_LAST_REGNUM)
- return NULL;
- return register_names[reg_nr];
+
+/* Set V to the constant K. */
+static void
+pv_set_to_constant (struct prologue_value *v, CORE_ADDR k)
+{
+ v->kind = pv_constant;
+ v->k = k;
}
+/* Set V to the original value of register REG, plus K. */
+static void
+pv_set_to_register (struct prologue_value *v, int reg, CORE_ADDR k)
+{
+ v->kind = pv_register;
+ v->reg = reg;
+ v->k = k;
+}
-int
-s390_stab_reg_to_regnum (int regno)
+/* If one of *A and *B is a constant, and the other isn't, swap the
+ pointers as necessary to ensure that *B points to the constant.
+ This can reduce the number of cases we need to analyze in the
+ functions below. */
+static void
+pv_constant_last (struct prologue_value **a,
+ struct prologue_value **b)
{
- return regno >= 64 ? S390_PSWM_REGNUM - 64 :
- regno >= 48 ? S390_FIRST_ACR - 48 :
- regno >= 32 ? S390_FIRST_CR - 32 :
- regno <= 15 ? (regno + 2) :
- S390_FP0_REGNUM + ((regno - 16) & 8) + (((regno - 16) & 3) << 1) +
- (((regno - 16) & 4) >> 2);
+ if ((*a)->kind == pv_constant
+ && (*b)->kind != pv_constant)
+ {
+ struct prologue_value *temp = *a;
+ *a = *b;
+ *b = temp;
+ }
}
-/* Return true if REGIDX is the number of a register used to pass
- arguments, false otherwise. */
-static int
-is_arg_reg (int regidx)
+/* Set SUM to the sum of A and B. SUM, A, and B may point to the same
+ 'struct prologue_value' object. */
+static void
+pv_add (struct prologue_value *sum,
+ struct prologue_value *a,
+ struct prologue_value *b)
{
- return 2 <= regidx && regidx <= 6;
+ pv_constant_last (&a, &b);
+
+ /* We can handle adding constants to registers, and other constants. */
+ if (b->kind == pv_constant
+ && (a->kind == pv_register
+ || a->kind == pv_constant))
+ {
+ sum->kind = a->kind;
+ sum->reg = a->reg; /* not meaningful if a is pv_constant, but
+ harmless */
+ sum->k = a->k + b->k;
+ }
+
+ /* Anything else we don't know how to add. We don't have a
+ representation for, say, the sum of two registers, or a multiple
+ of a register's value (adding a register to itself). */
+ else
+ sum->kind = pv_unknown;
}
-/* s390_get_frame_info based on Hartmuts
- prologue definition in
- gcc-2.8.1/config/l390/linux.c
+/* Add the constant K to V. */
+static void
+pv_add_constant (struct prologue_value *v, CORE_ADDR k)
+{
+ struct prologue_value pv_k;
+
+ /* Rather than thinking of all the cases we can and can't handle,
+ we'll just let pv_add take care of that for us. */
+ pv_set_to_constant (&pv_k, k);
+ pv_add (v, v, &pv_k);
+}
+
- It reads one instruction at a time & based on whether
- it looks like prologue code or not it makes a decision on
- whether the prologue is over, there are various state machines
- in the code to determine if the prologue code is possilby valid.
-
- This is done to hopefully allow the code survive minor revs of
- calling conventions.
+/* Subtract B from A, and put the result in DIFF.
- */
+ This isn't quite the same as negating B and adding it to A, since
+ we don't have a representation for the negation of anything but a
+ constant. For example, we can't negate { pv_register, R1, 10 },
+ but we do know that { pv_register, R1, 10 } minus { pv_register,
+ R1, 5 } is { pv_constant, <ignored>, 5 }.
-int
-s390_get_frame_info (CORE_ADDR pc, struct frame_extra_info *fextra_info,
- struct frame_info *fi, int init_extra_info)
+ This means, for example, that we can subtract two stack addresses;
+ they're both relative to the original SP. Since the frame pointer
+ is set based on the SP, its value will be the original SP plus some
+ constant (probably zero), so we can use its value just fine. */
+static void
+pv_subtract (struct prologue_value *diff,
+ struct prologue_value *a,
+ struct prologue_value *b)
{
-#define CONST_POOL_REGIDX 13
-#define GOT_REGIDX 12
- bfd_byte instr[S390_MAX_INSTR_SIZE];
- CORE_ADDR test_pc = pc, test_pc2;
- CORE_ADDR orig_sp = 0, save_reg_addr = 0, *saved_regs = NULL;
- int valid_prologue, good_prologue = 0;
- int gprs_saved[S390_NUM_GPRS];
- int fprs_saved[S390_NUM_FPRS];
- int regidx, instrlen;
- int const_pool_state;
- int varargs_state;
- int loop_cnt, gdb_gpr_store, gdb_fpr_store;
- int offset, expected_offset;
- int err = 0;
- disassemble_info info;
-
- /* Have we seen an instruction initializing the frame pointer yet?
- If we've seen an `lr %r11, %r15', then frame_pointer_found is
- non-zero, and frame_pointer_regidx == 11. Otherwise,
- frame_pointer_found is zero and frame_pointer_regidx is 15,
- indicating that we're using the stack pointer as our frame
- pointer. */
- int frame_pointer_found = 0;
- int frame_pointer_regidx = 0xf;
-
- /* What we've seen so far regarding saving the back chain link:
- 0 -- nothing yet; sp still has the same value it had at the entry
- point. Since not all functions allocate frames, this is a
- valid state for the prologue to finish in.
- 1 -- We've saved the original sp in some register other than the
- frame pointer (hard-coded to be %r11, yuck).
- save_link_regidx is the register we saved it in.
- 2 -- We've seen the initial `bras' instruction of the sequence for
- reserving more than 32k of stack:
- bras %rX, .+8
- .long N
- s %r15, 0(%rX)
- where %rX is not the constant pool register.
- subtract_sp_regidx is %rX, and fextra_info->stack_bought is N.
- 3 -- We've reserved space for a new stack frame. This means we
- either saw a simple `ahi %r15,-N' in state 1, or the final
- `s %r15, ...' in state 2.
- 4 -- The frame and link are now fully initialized. We've
- reserved space for the new stack frame, and stored the old
- stack pointer captured in the back chain pointer field. */
- int save_link_state = 0;
- int save_link_regidx, subtract_sp_regidx;
-
- /* What we've seen so far regarding r12 --- the GOT (Global Offset
- Table) pointer. We expect to see `l %r12, N(%r13)', which loads
- r12 with the offset from the constant pool to the GOT, and then
- an `ar %r12, %r13', which adds the constant pool address,
- yielding the GOT's address. Here's what got_state means:
- 0 -- seen nothing
- 1 -- seen `l %r12, N(%r13)', but no `ar'
- 2 -- seen load and add, so GOT pointer is totally initialized
- When got_state is 1, then got_load_addr is the address of the
- load instruction, and got_load_len is the length of that
- instruction. */
- int got_state= 0;
- CORE_ADDR got_load_addr = 0, got_load_len = 0;
-
- const_pool_state = varargs_state = 0;
-
- memset (gprs_saved, 0, sizeof (gprs_saved));
- memset (fprs_saved, 0, sizeof (fprs_saved));
- info.read_memory_func = dis_asm_read_memory;
-
- save_link_regidx = subtract_sp_regidx = 0;
- if (fextra_info)
+ pv_constant_last (&a, &b);
+
+ /* We can subtract a constant from another constant, or from a
+ register. */
+ if (b->kind == pv_constant
+ && (a->kind == pv_register
+ || a->kind == pv_constant))
{
- if (fi && fi->frame)
- {
- if (! init_extra_info && fextra_info->initialised)
- orig_sp = fi->frame + fextra_info->stack_bought;
- saved_regs = fi->saved_regs;
- }
- if (init_extra_info || !fextra_info->initialised)
- {
- s390_memset_extra_info (fextra_info);
- fextra_info->function_start = pc;
- fextra_info->initialised = 1;
- }
+ diff->kind = a->kind;
+ diff->reg = a->reg; /* not always meaningful, but harmless */
+ diff->k = a->k - b->k;
}
- instrlen = 0;
- do
+
+ /* We can subtract a register from itself, yielding a constant. */
+ else if (a->kind == pv_register
+ && b->kind == pv_register
+ && a->reg == b->reg)
{
- valid_prologue = 0;
- test_pc += instrlen;
- /* add the previous instruction len */
- instrlen = s390_readinstruction (instr, test_pc, &info);
- if (instrlen < 0)
- {
- good_prologue = 0;
- err = -1;
- break;
- }
- /* We probably are in a glibc syscall */
- if (instr[0] == S390_SYSCALL_OPCODE && test_pc == pc)
- {
- good_prologue = 1;
- if (saved_regs && fextra_info && fi->next && fi->next->extra_info
- && fi->next->extra_info->sigcontext)
- {
- /* We are backtracing from a signal handler */
- save_reg_addr = fi->next->extra_info->sigcontext +
- REGISTER_BYTE (S390_GP0_REGNUM);
- for (regidx = 0; regidx < S390_NUM_GPRS; regidx++)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- save_reg_addr = fi->next->extra_info->sigcontext +
- (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
- S390_SIGREGS_FP0_OFFSET);
- for (regidx = 0; regidx < S390_NUM_FPRS; regidx++)
- {
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_FPR_SIZE;
- }
- }
- break;
- }
- if (save_link_state == 0)
- {
- /* check for a stack relative STMG or STM */
- if (((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xeb) && (instr[5] == 0x24))) ||
- (instr[0] == 0x90)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = (instr[1] >> 4);
- if (regidx < 6)
- varargs_state = 1;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (saved_regs)
- save_reg_addr = orig_sp + offset;
- for (; regidx <= (instr[1] & 0xf); regidx++)
- {
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- save_reg_addr += S390_GPR_SIZE;
- }
- }
- valid_prologue = 1;
- continue;
- }
- }
- /* check for a stack relative STG or ST */
- if ((save_link_state == 0 || save_link_state == 3) &&
- ((GDB_TARGET_IS_ESAME &&
- ((instr[0] == 0xe3) && (instr[5] == 0x24))) ||
- (instr[0] == 0x50)) && ((instr[2] >> 4) == 0xf))
- {
- regidx = instr[1] >> 4;
- offset = ((instr[2] & 0xf) << 8) + instr[3];
- if (offset == 0)
- {
- if (save_link_state == 3 && regidx == save_link_regidx)
- {
- save_link_state = 4;
- valid_prologue = 1;
- continue;
- }
- else
- break;
- }
- if (regidx < 6)
- varargs_state = 1;
- expected_offset =
- S390_GPR6_STACK_OFFSET + (S390_GPR_SIZE * (regidx - 6));
- if (offset != expected_offset)
- {
- good_prologue = 0;
- break;
- }
- if (gprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- good_prologue = 1;
- gprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + offset;
- saved_regs[S390_GP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+ diff->kind = pv_constant;
+ diff->k = a->k - b->k;
+ }
- /* Check for an fp-relative STG, ST, or STM. This is probably
- spilling an argument from a register out into a stack slot.
- This could be a user instruction, but if we haven't included
- any other suspicious instructions in the prologue, this
- could only be an initializing store, which isn't too bad to
- skip. The consequences of not including arg-to-stack spills
- are more serious, though --- you don't see the proper values
- of the arguments. */
- if ((save_link_state == 3 || save_link_state == 4)
- && ((instr[0] == 0x50 /* st %rA, D(%rX,%rB) */
- && (instr[1] & 0xf) == 0 /* %rX is zero, no index reg */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)
- || (instr[0] == 0x90 /* stm %rA, %rB, D(%rC) */
- && is_arg_reg ((instr[1] >> 4) & 0xf)
- && is_arg_reg (instr[1] & 0xf)
- && ((instr[2] >> 4) & 0xf) == frame_pointer_regidx)))
- {
- valid_prologue = 1;
- continue;
- }
+ /* We don't know how to subtract anything else. */
+ else
+ diff->kind = pv_unknown;
+}
- /* check for STD */
- if (instr[0] == 0x60 && (instr[2] >> 4) == 0xf)
- {
- regidx = instr[1] >> 4;
- if (regidx == 0 || regidx == 2)
- varargs_state = 1;
- if (fprs_saved[regidx])
- {
- good_prologue = 0;
- break;
- }
- fprs_saved[regidx] = 1;
- if (saved_regs)
- {
- save_reg_addr = orig_sp + (((instr[2] & 0xf) << 8) + instr[3]);
- saved_regs[S390_FP0_REGNUM + regidx] = save_reg_addr;
- }
- valid_prologue = 1;
- continue;
- }
+/* Set AND to the logical and of A and B. */
+static void
+pv_logical_and (struct prologue_value *and,
+ struct prologue_value *a,
+ struct prologue_value *b)
+{
+ pv_constant_last (&a, &b);
- if (const_pool_state == 0)
- {
+ /* We can 'and' two constants. */
+ if (a->kind == pv_constant
+ && b->kind == pv_constant)
+ {
+ and->kind = pv_constant;
+ and->k = a->k & b->k;
+ }
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl CONST_POOL_REGIDX,offset on ESAME */
- if ((instr[0] == 0xc0)
- && (instr[1] == (CONST_POOL_REGIDX << 4)))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- else
- {
- /* Check for BASR gpr13,gpr0 used to load constant pool pointer to r13 in old compiler */
- if (instr[0] == 0xd && (instr[1] & 0xf) == 0
- && ((instr[1] >> 4) == CONST_POOL_REGIDX))
- {
- const_pool_state = 1;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for new fangled bras %r13,newpc to load new constant pool */
- /* embedded in code, older pre abi compilers also emitted this stuff. */
- if ((instr[0] == 0xa7) && ((instr[1] & 0xf) == 0x5) &&
- ((instr[1] >> 4) == CONST_POOL_REGIDX)
- && ((instr[2] & 0x80) == 0))
- {
- const_pool_state = 2;
- test_pc +=
- (((((instr[2] & 0xf) << 8) + instr[3]) << 1) - instrlen);
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AGHI or AHI CONST_POOL_REGIDX,val */
- if (const_pool_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME &&
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xb))) ||
- (instr[1] == ((CONST_POOL_REGIDX << 4) | 0xa))))
- {
- const_pool_state = 2;
- valid_prologue = 1;
- continue;
- }
- /* Check for LGR or LR gprx,15 */
- if ((GDB_TARGET_IS_ESAME &&
- instr[0] == 0xb9 && instr[1] == 0x04 && (instr[3] & 0xf) == 0xf) ||
- (instr[0] == 0x18 && (instr[1] & 0xf) == 0xf))
- {
- if (GDB_TARGET_IS_ESAME)
- regidx = instr[3] >> 4;
- else
- regidx = instr[1] >> 4;
- if (save_link_state == 0 && regidx != 0xb)
- {
- /* Almost defintely code for
- decrementing the stack pointer
- ( i.e. a non leaf function
- or else leaf with locals ) */
- save_link_regidx = regidx;
- save_link_state = 1;
- valid_prologue = 1;
- continue;
- }
- /* We use this frame pointer for alloca
- unfortunately we need to assume its gpr11
- otherwise we would need a smarter prologue
- walker. */
- if (!frame_pointer_found && regidx == 0xb)
- {
- frame_pointer_regidx = 0xb;
- frame_pointer_found = 1;
- if (fextra_info)
- fextra_info->frame_pointer_saved_pc = test_pc;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for AHI or AGHI gpr15,val */
- if (save_link_state == 1 && (instr[0] == 0xa7) &&
- ((GDB_TARGET_IS_ESAME && (instr[1] == 0xfb)) || (instr[1] == 0xfa)))
- {
- if (fextra_info)
- fextra_info->stack_bought =
- -extract_signed_integer (&instr[2], 2);
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* Alternatively check for the complex construction for
- buying more than 32k of stack
- BRAS gprx,.+8
- long val
- s %r15,0(%gprx) gprx currently r1 */
- if ((save_link_state == 1) && (instr[0] == 0xa7)
- && ((instr[1] & 0xf) == 0x5) && (instr[2] == 0)
- && (instr[3] == 0x4) && ((instr[1] >> 4) != CONST_POOL_REGIDX))
- {
- subtract_sp_regidx = instr[1] >> 4;
- save_link_state = 2;
- if (fextra_info)
- target_read_memory (test_pc + instrlen,
- (char *) &fextra_info->stack_bought,
- sizeof (fextra_info->stack_bought));
- test_pc += 4;
- valid_prologue = 1;
- continue;
- }
- if (save_link_state == 2 && instr[0] == 0x5b
- && instr[1] == 0xf0 &&
- instr[2] == (subtract_sp_regidx << 4) && instr[3] == 0)
- {
- save_link_state = 3;
- valid_prologue = 1;
- continue;
- }
- /* check for LA gprx,offset(15) used for varargs */
- if ((instr[0] == 0x41) && ((instr[2] >> 4) == 0xf) &&
- ((instr[1] & 0xf) == 0))
- {
- /* some code uses gpr7 to point to outgoing args */
- if (((instr[1] >> 4) == 7) && (save_link_state == 0) &&
- ((instr[2] & 0xf) == 0)
- && (instr[3] == S390_STACK_FRAME_OVERHEAD))
- {
- valid_prologue = 1;
- continue;
- }
- if (varargs_state == 1)
- {
- varargs_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
- /* Check for a GOT load */
+ /* We can 'and' anything with the constant zero. */
+ else if (b->kind == pv_constant
+ && b->k == 0)
+ {
+ and->kind = pv_constant;
+ and->k = 0;
+ }
+
+ /* We can 'and' anything with ~0. */
+ else if (b->kind == pv_constant
+ && b->k == ~ (CORE_ADDR) 0)
+ *and = *a;
+
+ /* We can 'and' a register with itself. */
+ else if (a->kind == pv_register
+ && b->kind == pv_register
+ && a->reg == b->reg
+ && a->k == b->k)
+ *and = *a;
+
+ /* Otherwise, we don't know. */
+ else
+ pv_set_to_unknown (and);
+}
- if (GDB_TARGET_IS_ESAME)
- {
- /* Check for larl GOT_REGIDX, on ESAME */
- if ((got_state == 0) && (instr[0] == 0xc0)
- && (instr[1] == (GOT_REGIDX << 4)))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
+
+/* Return non-zero iff A and B are identical expressions.
+
+ This is not the same as asking if the two values are equal; the
+ result of such a comparison would have to be a pv_boolean, and
+ asking whether two 'unknown' values were equal would give you
+ pv_maybe. Same for comparing, say, { pv_register, R1, 0 } and {
+ pv_register, R2, 0}. Instead, this is asking whether the two
+ representations are the same. */
+static int
+pv_is_identical (struct prologue_value *a,
+ struct prologue_value *b)
+{
+ if (a->kind != b->kind)
+ return 0;
+
+ switch (a->kind)
+ {
+ case pv_unknown:
+ return 1;
+ case pv_constant:
+ return (a->k == b->k);
+ case pv_register:
+ return (a->reg == b->reg && a->k == b->k);
+ default:
+ gdb_assert (0);
+ }
+}
+
+
+/* Return non-zero if A is the original value of register number R
+ plus K, zero otherwise. */
+static int
+pv_is_register (struct prologue_value *a, int r, CORE_ADDR k)
+{
+ return (a->kind == pv_register
+ && a->reg == r
+ && a->k == k);
+}
+
+
+/* A prologue-value-esque boolean type, including "maybe", when we
+ can't figure out whether something is true or not. */
+enum pv_boolean {
+ pv_maybe,
+ pv_definite_yes,
+ pv_definite_no,
+};
+
+
+/* Decide whether a reference to SIZE bytes at ADDR refers exactly to
+ an element of an array. The array starts at ARRAY_ADDR, and has
+ ARRAY_LEN values of ELT_SIZE bytes each. If ADDR definitely does
+ refer to an array element, set *I to the index of the referenced
+ element in the array, and return pv_definite_yes. If it definitely
+ doesn't, return pv_definite_no. If we can't tell, return pv_maybe.
+
+ If the reference does touch the array, but doesn't fall exactly on
+ an element boundary, or doesn't refer to the whole element, return
+ pv_maybe. */
+static enum pv_boolean
+pv_is_array_ref (struct prologue_value *addr,
+ CORE_ADDR size,
+ struct prologue_value *array_addr,
+ CORE_ADDR array_len,
+ CORE_ADDR elt_size,
+ int *i)
+{
+ struct prologue_value offset;
+
+ /* Note that, since ->k is a CORE_ADDR, and CORE_ADDR is unsigned,
+ if addr is *before* the start of the array, then this isn't going
+ to be negative... */
+ pv_subtract (&offset, addr, array_addr);
+
+ if (offset.kind == pv_constant)
+ {
+ /* This is a rather odd test. We want to know if the SIZE bytes
+ at ADDR don't overlap the array at all, so you'd expect it to
+ be an || expression: "if we're completely before || we're
+ completely after". But with unsigned arithmetic, things are
+ different: since it's a number circle, not a number line, the
+ right values for offset.k are actually one contiguous range. */
+ if (offset.k <= -size
+ && offset.k >= array_len * elt_size)
+ return pv_definite_no;
+ else if (offset.k % elt_size != 0
+ || size != elt_size)
+ return pv_maybe;
else
- {
- /* check for l GOT_REGIDX,x(CONST_POOL_REGIDX) */
- if (got_state == 0 && const_pool_state == 2 && instr[0] == 0x58
- && (instr[2] == (CONST_POOL_REGIDX << 4))
- && ((instr[1] >> 4) == GOT_REGIDX))
- {
- got_state = 1;
- got_load_addr = test_pc;
- got_load_len = instrlen;
- valid_prologue = 1;
- continue;
- }
- /* Check for subsequent ar got_regidx,basr_regidx */
- if (got_state == 1 && instr[0] == 0x1a &&
- instr[1] == ((GOT_REGIDX << 4) | CONST_POOL_REGIDX))
- {
- got_state = 2;
- valid_prologue = 1;
- continue;
- }
- }
+ {
+ *i = offset.k / elt_size;
+ return pv_definite_yes;
+ }
+ }
+ else
+ return pv_maybe;
+}
+
+
+
+/* Decoding S/390 instructions. */
+
+/* Named opcode values for the S/390 instructions we recognize. Some
+ instructions have their opcode split across two fields; those are the
+ op1_* and op2_* enums. */
+enum
+ {
+ op1_aghi = 0xa7, op2_aghi = 0xb,
+ op1_ahi = 0xa7, op2_ahi = 0xa,
+ op_ar = 0x1a,
+ op_basr = 0x0d,
+ op1_bras = 0xa7, op2_bras = 0x5,
+ op_l = 0x58,
+ op_la = 0x41,
+ op1_larl = 0xc0, op2_larl = 0x0,
+ op_lgr = 0xb904,
+ op1_lghi = 0xa7, op2_lghi = 0x9,
+ op1_lhi = 0xa7, op2_lhi = 0x8,
+ op_lr = 0x18,
+ op_nr = 0x14,
+ op_ngr = 0xb980,
+ op_s = 0x5b,
+ op_st = 0x50,
+ op_std = 0x60,
+ op1_stg = 0xe3, op2_stg = 0x24,
+ op_stm = 0x90,
+ op1_stmg = 0xeb, op2_stmg = 0x24,
+ op_lm = 0x98,
+ op1_lmg = 0xeb, op2_lmg = 0x04,
+ op_svc = 0x0a,
+ };
+
+
+/* The functions below are for recognizing and decoding S/390
+ instructions of various formats. Each of them checks whether INSN
+ is an instruction of the given format, with the specified opcodes.
+ If it is, it sets the remaining arguments to the values of the
+ instruction's fields, and returns a non-zero value; otherwise, it
+ returns zero.
+
+ These functions' arguments appear in the order they appear in the
+ instruction, not in the machine-language form. So, opcodes always
+ come first, even though they're sometimes scattered around the
+ instructions. And displacements appear before base and extension
+ registers, as they do in the assembly syntax, not at the end, as
+ they do in the machine language. */
+static int
+is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
+{
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a 16-bit signed quantity. */
+ *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_ril (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, int *i2)
+{
+ if (insn[0] == op1 && (insn[1] & 0xf) == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ /* i2 is a signed quantity. If the host 'int' is 32 bits long,
+ no sign extension is necessary, but we don't want to assume
+ that. */
+ *i2 = (((insn[2] << 24)
+ | (insn[3] << 16)
+ | (insn[4] << 8)
+ | (insn[5])) ^ 0x80000000) - 0x80000000;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (insn[0] == op)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r2 = insn[1] & 0xf;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
+{
+ if (((insn[0] << 8) | insn[1]) == op)
+ {
+ /* Yes, insn[3]. insn[2] is unused in RRE format. */
+ *r1 = (insn[3] >> 4) & 0xf;
+ *r2 = insn[3] & 0xf;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rs (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rse (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ /* Yes, insn[5]. insn[4] is unused. */
+ && insn[5] == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *r3 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rx (bfd_byte *insn, int op,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+static int
+is_rxe (bfd_byte *insn, int op1, int op2,
+ unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)
+{
+ if (insn[0] == op1
+ /* Yes, insn[5]. insn[4] is unused. */
+ && insn[5] == op2)
+ {
+ *r1 = (insn[1] >> 4) & 0xf;
+ *x2 = insn[1] & 0xf;
+ *b2 = (insn[2] >> 4) & 0xf;
+ *d2 = ((insn[2] & 0xf) << 8) | insn[3];
+ return 1;
+ }
+ else
+ return 0;
+}
+
+
+/* Set ADDR to the effective address for an X-style instruction, like:
+
+ L R1, D2(X2, B2)
+
+ Here, X2 and B2 are registers, and D2 is an unsigned 12-bit
+ constant; the effective address is the sum of all three. If either
+ X2 or B2 are zero, then it doesn't contribute to the sum --- this
+ means that r0 can't be used as either X2 or B2.
+
+ GPR is an array of general register values, indexed by GPR number,
+ not GDB register number. */
+static void
+compute_x_addr (struct prologue_value *addr,
+ struct prologue_value *gpr,
+ unsigned int d2, unsigned int x2, unsigned int b2)
+{
+ /* We can't just add stuff directly in addr; it might alias some of
+ the registers we need to read. */
+ struct prologue_value result;
+
+ pv_set_to_constant (&result, d2);
+ if (x2)
+ pv_add (&result, &result, &gpr[x2]);
+ if (b2)
+ pv_add (&result, &result, &gpr[b2]);
+
+ *addr = result;
+}
+
+
+/* The number of GPR and FPR spill slots in an S/390 stack frame. We
+ track general-purpose registers r2 -- r15, and floating-point
+ registers f0, f2, f4, and f6. */
+#define S390_NUM_SPILL_SLOTS (14 + 4)
+#define S390_NUM_GPRS 16
+#define S390_NUM_FPRS 16
+
+
+/* If the SIZE bytes at ADDR are a stack slot we're actually tracking,
+ return pv_definite_yes and set *STACK to point to the slot. If
+ we're sure that they are not any of our stack slots, then return
+ pv_definite_no. Otherwise, return pv_maybe.
+ - GPR is an array indexed by GPR number giving the current values
+ of the general-purpose registers.
+ - SPILL is an array tracking the spill area of the caller's frame;
+ SPILL[i] is the i'th spill slot. The spill slots are designated
+ for r2 -- r15, and then f0, f2, f4, and f6.
+ - BACK_CHAIN is the value of the back chain slot; it's only valid
+ when the current frame actually has some space for a back chain
+ slot --- that is, when the current value of the stack pointer
+ (according to GPR) is at least S390_STACK_FRAME_OVERHEAD bytes
+ less than its original value. */
+static enum pv_boolean
+s390_on_stack (struct prologue_value *addr,
+ CORE_ADDR size,
+ struct prologue_value *gpr,
+ struct prologue_value *spill,
+ struct prologue_value *back_chain,
+ struct prologue_value **stack)
+{
+ struct prologue_value gpr_spill_addr;
+ struct prologue_value fpr_spill_addr;
+ struct prologue_value back_chain_addr;
+ int i;
+ enum pv_boolean b;
+
+ /* Construct the addresses of the spill arrays and the back chain. */
+ pv_set_to_register (&gpr_spill_addr, S390_SP_REGNUM, 2 * S390_GPR_SIZE);
+ pv_set_to_register (&fpr_spill_addr, S390_SP_REGNUM, 16 * S390_GPR_SIZE);
+ back_chain_addr = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+ /* We have to check for GPR and FPR references using two separate
+ calls to pv_is_array_ref, since the GPR and FPR spill slots are
+ different sizes. (SPILL is an array, but the thing it tracks
+ isn't really an array.) */
+
+ /* Was it a reference to the GPR spill array? */
+ b = pv_is_array_ref (addr, size, &gpr_spill_addr, 14, S390_GPR_SIZE, &i);
+ if (b == pv_definite_yes)
+ {
+ *stack = &spill[i];
+ return pv_definite_yes;
+ }
+ if (b == pv_maybe)
+ return pv_maybe;
+
+ /* Was it a reference to the FPR spill array? */
+ b = pv_is_array_ref (addr, size, &fpr_spill_addr, 4, S390_FPR_SIZE, &i);
+ if (b == pv_definite_yes)
+ {
+ *stack = &spill[14 + i];
+ return pv_definite_yes;
+ }
+ if (b == pv_maybe)
+ return pv_maybe;
+
+ /* Was it a reference to the back chain?
+ This isn't quite right. We ought to check whether we have
+ actually allocated any new frame at all. */
+ b = pv_is_array_ref (addr, size, &back_chain_addr, 1, S390_GPR_SIZE, &i);
+ if (b == pv_definite_yes)
+ {
+ *stack = back_chain;
+ return pv_definite_yes;
+ }
+ if (b == pv_maybe)
+ return pv_maybe;
+
+ /* All the above queries returned definite 'no's. */
+ return pv_definite_no;
+}
+
+
+/* Do a SIZE-byte store of VALUE to ADDR. GPR, SPILL, and BACK_CHAIN,
+ and the return value are as described for s390_on_stack, above.
+ Note that, when this returns pv_maybe, we have to assume that all
+ of our memory now contains unknown values. */
+static enum pv_boolean
+s390_store (struct prologue_value *addr,
+ CORE_ADDR size,
+ struct prologue_value *value,
+ struct prologue_value *gpr,
+ struct prologue_value *spill,
+ struct prologue_value *back_chain)
+{
+ struct prologue_value *stack;
+ enum pv_boolean on_stack
+ = s390_on_stack (addr, size, gpr, spill, back_chain, &stack);
+
+ if (on_stack == pv_definite_yes)
+ *stack = *value;
+
+ return on_stack;
+}
+
+
+/* The current frame looks like a signal delivery frame: the first
+ instruction is an 'svc' opcode. If the next frame is a signal
+ handler's frame, set FI's saved register map to point into the
+ signal context structure. */
+static void
+s390_get_signal_frame_info (struct frame_info *fi)
+{
+ struct frame_info *next_frame = get_next_frame (fi);
+
+ if (next_frame
+ && get_frame_extra_info (next_frame)
+ && get_frame_extra_info (next_frame)->sigcontext)
+ {
+ /* We're definitely backtracing from a signal handler. */
+ CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi);
+ CORE_ADDR save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext
+ + DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM));
+ int reg;
+
+ for (reg = 0; reg < S390_NUM_GPRS; reg++)
+ {
+ saved_regs[S390_R0_REGNUM + reg] = save_reg_addr;
+ save_reg_addr += S390_GPR_SIZE;
+ }
+
+ save_reg_addr = (get_frame_extra_info (next_frame)->sigcontext
+ + (GDB_TARGET_IS_ESAME ? S390X_SIGREGS_FP0_OFFSET :
+ S390_SIGREGS_FP0_OFFSET));
+ for (reg = 0; reg < S390_NUM_FPRS; reg++)
+ {
+ saved_regs[S390_F0_REGNUM + reg] = save_reg_addr;
+ save_reg_addr += S390_FPR_SIZE;
+ }
}
- while (valid_prologue && good_prologue);
- if (good_prologue)
+}
+
+
+static int
+s390_get_frame_info (CORE_ADDR start_pc,
+ struct frame_extra_info *fextra_info,
+ struct frame_info *fi,
+ int init_extra_info)
+{
+ /* Our return value:
+ zero if we were able to read all the instructions we wanted, or
+ -1 if we got an error trying to read memory. */
+ int result = 0;
+
+ /* The current PC for our abstract interpretation. */
+ CORE_ADDR pc;
+
+ /* The address of the next instruction after that. */
+ CORE_ADDR next_pc;
+
+ /* The general-purpose registers. */
+ struct prologue_value gpr[S390_NUM_GPRS];
+
+ /* The floating-point registers. */
+ struct prologue_value fpr[S390_NUM_FPRS];
+
+ /* The register spill stack slots in the caller's frame ---
+ general-purpose registers r2 through r15, and floating-point
+ registers. spill[i] is where gpr i+2 gets spilled;
+ spill[(14, 15, 16, 17)] is where (f0, f2, f4, f6) get spilled. */
+ struct prologue_value spill[S390_NUM_SPILL_SLOTS];
+
+ /* The value of the back chain slot. This is only valid if the stack
+ pointer is known to be less than its original value --- that is,
+ if we have indeed allocated space on the stack. */
+ struct prologue_value back_chain;
+
+ /* The address of the instruction after the last one that changed
+ the SP, FP, or back chain. */
+ CORE_ADDR after_last_frame_setup_insn = start_pc;
+
+ /* Set up everything's initial value. */
+ {
+ int i;
+
+ for (i = 0; i < S390_NUM_GPRS; i++)
+ pv_set_to_register (&gpr[i], S390_R0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_FPRS; i++)
+ pv_set_to_register (&fpr[i], S390_F0_REGNUM + i, 0);
+
+ for (i = 0; i < S390_NUM_SPILL_SLOTS; i++)
+ pv_set_to_unknown (&spill[i]);
+
+ pv_set_to_unknown (&back_chain);
+ }
+
+ /* Start interpreting instructions, until we hit something we don't
+ know how to interpret. (Ideally, we should stop at the frame's
+ real current PC, but at the moment, our callers don't give us
+ that info.) */
+ for (pc = start_pc; ; pc = next_pc)
{
- /* If this function doesn't reference the global offset table,
- then the compiler may use r12 for other things. If the last
- instruction we saw was a load of r12 from the constant pool,
- with no subsequent add to make the address PC-relative, then
- the load was probably a genuine body instruction; don't treat
- it as part of the prologue. */
- if (got_state == 1
- && got_load_addr + got_load_len == test_pc)
+ bfd_byte insn[S390_MAX_INSTR_SIZE];
+ int insn_len = s390_readinstruction (insn, pc);
+
+ /* Fields for various kinds of instructions. */
+ unsigned int b2, r1, r2, d2, x2, r3;
+ int i2;
+
+ /* The values of SP, FP, and back chain before this instruction,
+ for detecting instructions that change them. */
+ struct prologue_value pre_insn_sp, pre_insn_fp, pre_insn_back_chain;
+
+ /* If we got an error trying to read the instruction, report it. */
+ if (insn_len < 0)
+ {
+ result = -1;
+ break;
+ }
+
+ next_pc = pc + insn_len;
+
+ pre_insn_sp = gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ pre_insn_fp = gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+ pre_insn_back_chain = back_chain;
+
+ /* A special case, first --- only recognized as the very first
+ instruction of the function, for signal delivery frames:
+ SVC i --- system call */
+ if (pc == start_pc
+ && is_rr (insn, op_svc, &r1, &r2))
+ {
+ if (fi)
+ s390_get_signal_frame_info (fi);
+ break;
+ }
+
+ /* AHI r1, i2 --- add halfword immediate */
+ else if (is_ri (insn, op1_ahi, op2_ahi, &r1, &i2))
+ pv_add_constant (&gpr[r1], i2);
+
+
+ /* AGHI r1, i2 --- add halfword immediate (64-bit version) */
+ else if (GDB_TARGET_IS_ESAME
+ && is_ri (insn, op1_aghi, op2_aghi, &r1, &i2))
+ pv_add_constant (&gpr[r1], i2);
+
+ /* AR r1, r2 -- add register */
+ else if (is_rr (insn, op_ar, &r1, &r2))
+ pv_add (&gpr[r1], &gpr[r1], &gpr[r2]);
+
+ /* BASR r1, 0 --- branch and save
+ Since r2 is zero, this saves the PC in r1, but doesn't branch. */
+ else if (is_rr (insn, op_basr, &r1, &r2)
+ && r2 == 0)
+ pv_set_to_constant (&gpr[r1], next_pc);
+
+ /* BRAS r1, i2 --- branch relative and save */
+ else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
+ {
+ pv_set_to_constant (&gpr[r1], next_pc);
+ next_pc = pc + i2 * 2;
+
+ /* We'd better not interpret any backward branches. We'll
+ never terminate. */
+ if (next_pc <= pc)
+ break;
+ }
+
+ /* L r1, d2(x2, b2) --- load */
+ else if (is_rx (insn, op_l, &r1, &d2, &x2, &b2))
+ {
+ struct prologue_value addr;
+ struct prologue_value *stack;
+
+ compute_x_addr (&addr, gpr, d2, x2, b2);
+
+ /* If it's a load from an in-line constant pool, then we can
+ simulate that, under the assumption that the code isn't
+ going to change between the time the processor actually
+ executed it creating the current frame, and the time when
+ we're analyzing the code to unwind past that frame. */
+ if (addr.kind == pv_constant
+ && start_pc <= addr.k
+ && addr.k < next_pc)
+ pv_set_to_constant (&gpr[r1],
+ read_memory_integer (addr.k, 4));
+
+ /* If it's definitely a reference to something on the stack,
+ we can do that. */
+ else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack)
+ == pv_definite_yes)
+ gpr[r1] = *stack;
+
+ /* Otherwise, we don't know the value. */
+ else
+ pv_set_to_unknown (&gpr[r1]);
+ }
+
+ /* LA r1, d2(x2, b2) --- load address */
+ else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2))
+ compute_x_addr (&gpr[r1], gpr, d2, x2, b2);
+
+ /* LARL r1, i2 --- load address relative long */
+ else if (GDB_TARGET_IS_ESAME
+ && is_ril (insn, op1_larl, op2_larl, &r1, &i2))
+ pv_set_to_constant (&gpr[r1], pc + i2 * 2);
+
+ /* LGR r1, r2 --- load from register */
+ else if (GDB_TARGET_IS_ESAME
+ && is_rre (insn, op_lgr, &r1, &r2))
+ gpr[r1] = gpr[r2];
+
+ /* LHI r1, i2 --- load halfword immediate */
+ else if (is_ri (insn, op1_lhi, op2_lhi, &r1, &i2))
+ pv_set_to_constant (&gpr[r1], i2);
+
+ /* LGHI r1, i2 --- load halfword immediate --- 64-bit version */
+ else if (is_ri (insn, op1_lghi, op2_lghi, &r1, &i2))
+ pv_set_to_constant (&gpr[r1], i2);
+
+ /* LR r1, r2 --- load from register */
+ else if (is_rr (insn, op_lr, &r1, &r2))
+ gpr[r1] = gpr[r2];
+
+ /* NGR r1, r2 --- logical and --- 64-bit version */
+ else if (GDB_TARGET_IS_ESAME
+ && is_rre (insn, op_ngr, &r1, &r2))
+ pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
+
+ /* NR r1, r2 --- logical and */
+ else if (is_rr (insn, op_nr, &r1, &r2))
+ pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
+
+ /* NGR r1, r2 --- logical and --- 64-bit version */
+ else if (GDB_TARGET_IS_ESAME
+ && is_rre (insn, op_ngr, &r1, &r2))
+ pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
+
+ /* NR r1, r2 --- logical and */
+ else if (is_rr (insn, op_nr, &r1, &r2))
+ pv_logical_and (&gpr[r1], &gpr[r1], &gpr[r2]);
+
+ /* S r1, d2(x2, b2) --- subtract from memory */
+ else if (is_rx (insn, op_s, &r1, &d2, &x2, &b2))
+ {
+ struct prologue_value addr;
+ struct prologue_value value;
+ struct prologue_value *stack;
+
+ compute_x_addr (&addr, gpr, d2, x2, b2);
+
+ /* If it's a load from an in-line constant pool, then we can
+ simulate that, under the assumption that the code isn't
+ going to change between the time the processor actually
+ executed it and the time when we're analyzing it. */
+ if (addr.kind == pv_constant
+ && start_pc <= addr.k
+ && addr.k < pc)
+ pv_set_to_constant (&value, read_memory_integer (addr.k, 4));
+
+ /* If it's definitely a reference to something on the stack,
+ we could do that. */
+ else if (s390_on_stack (&addr, 4, gpr, spill, &back_chain, &stack)
+ == pv_definite_yes)
+ value = *stack;
+
+ /* Otherwise, we don't know the value. */
+ else
+ pv_set_to_unknown (&value);
+
+ pv_subtract (&gpr[r1], &gpr[r1], &value);
+ }
+
+ /* ST r1, d2(x2, b2) --- store */
+ else if (is_rx (insn, op_st, &r1, &d2, &x2, &b2))
+ {
+ struct prologue_value addr;
+
+ compute_x_addr (&addr, gpr, d2, x2, b2);
+
+ /* The below really should be '4', not 'S390_GPR_SIZE'; this
+ instruction always stores 32 bits, regardless of the full
+ size of the GPR. */
+ if (s390_store (&addr, 4, &gpr[r1], gpr, spill, &back_chain)
+ == pv_maybe)
+ /* If we can't be sure that it's *not* a store to
+ something we're tracing, then we would have to mark all
+ our memory as unknown --- after all, it *could* be a
+ store to any of them --- so we might as well just stop
+ interpreting. */
+ break;
+ }
+
+ /* STD r1, d2(x2,b2) --- store floating-point register */
+ else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
+ {
+ struct prologue_value addr;
+
+ compute_x_addr (&addr, gpr, d2, x2, b2);
+
+ if (s390_store (&addr, 8, &fpr[r1], gpr, spill, &back_chain)
+ == pv_maybe)
+ /* If we can't be sure that it's *not* a store to
+ something we're tracing, then we would have to mark all
+ our memory as unknown --- after all, it *could* be a
+ store to any of them --- so we might as well just stop
+ interpreting. */
+ break;
+ }
+
+ /* STG r1, d2(x2, b2) --- 64-bit store */
+ else if (GDB_TARGET_IS_ESAME
+ && is_rxe (insn, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
+ {
+ struct prologue_value addr;
+
+ compute_x_addr (&addr, gpr, d2, x2, b2);
+
+ /* The below really should be '8', not 'S390_GPR_SIZE'; this
+ instruction always stores 64 bits, regardless of the full
+ size of the GPR. */
+ if (s390_store (&addr, 8, &gpr[r1], gpr, spill, &back_chain)
+ == pv_maybe)
+ /* If we can't be sure that it's *not* a store to
+ something we're tracing, then we would have to mark all
+ our memory as unknown --- after all, it *could* be a
+ store to any of them --- so we might as well just stop
+ interpreting. */
+ break;
+ }
+
+ /* STM r1, r3, d2(b2) --- store multiple */
+ else if (is_rs (insn, op_stm, &r1, &r3, &d2, &b2))
{
- test_pc = got_load_addr;
- instrlen = got_load_len;
+ int regnum;
+ int offset;
+ struct prologue_value addr;
+
+ for (regnum = r1, offset = 0;
+ regnum <= r3;
+ regnum++, offset += 4)
+ {
+ compute_x_addr (&addr, gpr, d2 + offset, 0, b2);
+
+ if (s390_store (&addr, 4, &gpr[regnum], gpr, spill, &back_chain)
+ == pv_maybe)
+ /* If we can't be sure that it's *not* a store to
+ something we're tracing, then we would have to mark all
+ our memory as unknown --- after all, it *could* be a
+ store to any of them --- so we might as well just stop
+ interpreting. */
+ break;
+ }
+
+ /* If we left the loop early, we should stop interpreting
+ altogether. */
+ if (regnum <= r3)
+ break;
}
+
+ /* STMG r1, r3, d2(b2) --- store multiple, 64-bit */
+ else if (GDB_TARGET_IS_ESAME
+ && is_rse (insn, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
+ {
+ int regnum;
+ int offset;
+ struct prologue_value addr;
+
+ for (regnum = r1, offset = 0;
+ regnum <= r3;
+ regnum++, offset += 8)
+ {
+ compute_x_addr (&addr, gpr, d2 + offset, 0, b2);
+
+ if (s390_store (&addr, 8, &gpr[regnum], gpr, spill, &back_chain)
+ == pv_maybe)
+ /* If we can't be sure that it's *not* a store to
+ something we're tracing, then we would have to mark all
+ our memory as unknown --- after all, it *could* be a
+ store to any of them --- so we might as well just stop
+ interpreting. */
+ break;
+ }
+
+ /* If we left the loop early, we should stop interpreting
+ altogether. */
+ if (regnum <= r3)
+ break;
+ }
+
+ else
+ /* An instruction we don't know how to simulate. The only
+ safe thing to do would be to set every value we're tracking
+ to 'unknown'. Instead, we'll be optimistic: we just stop
+ interpreting, and assume that the machine state we've got
+ now is good enough for unwinding the stack. */
+ break;
+
+ /* Record the address after the last instruction that changed
+ the FP, SP, or backlink. Ignore instructions that changed
+ them back to their original values --- those are probably
+ restore instructions. (The back chain is never restored,
+ just popped.) */
+ {
+ struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+ struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
- good_prologue = (((const_pool_state == 0) || (const_pool_state == 2)) &&
- ((save_link_state == 0) || (save_link_state == 4)) &&
- ((varargs_state == 0) || (varargs_state == 2)));
+ if ((! pv_is_identical (&pre_insn_sp, sp)
+ && ! pv_is_register (sp, S390_SP_REGNUM, 0))
+ || (! pv_is_identical (&pre_insn_fp, fp)
+ && ! pv_is_register (fp, S390_FRAME_REGNUM, 0))
+ || ! pv_is_identical (&pre_insn_back_chain, &back_chain))
+ after_last_frame_setup_insn = next_pc;
+ }
}
- if (fextra_info)
+
+ /* Okay, now gpr[], fpr[], spill[], and back_chain reflect the state
+ of the machine as of the first instruction we couldn't interpret
+ (hopefully the first non-prologue instruction). */
+ {
+ /* The size of the frame, or (CORE_ADDR) -1 if we couldn't figure
+ that out. */
+ CORE_ADDR frame_size = -1;
+
+ /* The value the SP had upon entry to the function, or
+ (CORE_ADDR) -1 if we can't figure that out. */
+ CORE_ADDR original_sp = -1;
+
+ /* Are we using S390_FRAME_REGNUM as a frame pointer register? */
+ int using_frame_pointer = 0;
+
+ /* If S390_FRAME_REGNUM is some constant offset from the SP, then
+ that strongly suggests that we're going to use that as our
+ frame pointer register, not the SP. */
{
- fextra_info->good_prologue = good_prologue;
- fextra_info->skip_prologue_function_start =
- (good_prologue ? test_pc : pc);
+ struct prologue_value *fp = &gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
+
+ if (fp->kind == pv_register
+ && fp->reg == S390_SP_REGNUM)
+ using_frame_pointer = 1;
}
- if (saved_regs)
- /* The SP's element of the saved_regs array holds the old SP,
- not the address at which it is saved. */
- saved_regs[S390_SP_REGNUM] = orig_sp;
- return err;
+
+ /* If we were given a frame_info structure, we may be able to use
+ the frame's base address to figure out the actual value of the
+ original SP. */
+ if (fi && get_frame_base (fi))
+ {
+ int frame_base_regno;
+ struct prologue_value *frame_base;
+
+ /* The meaning of the frame base depends on whether the
+ function uses a frame pointer register other than the SP or
+ not (see s390_read_fp):
+ - If the function does use a frame pointer register other
+ than the SP, then the frame base is that register's
+ value.
+ - If the function doesn't use a frame pointer, then the
+ frame base is the SP itself.
+ We're duplicating some of the logic of s390_fp_regnum here,
+ but we don't want to call that, because it would just do
+ exactly the same analysis we've already done above. */
+ if (using_frame_pointer)
+ frame_base_regno = S390_FRAME_REGNUM;
+ else
+ frame_base_regno = S390_SP_REGNUM;
+
+ frame_base = &gpr[frame_base_regno - S390_R0_REGNUM];
+
+ /* We know the frame base address; if the value of whatever
+ register it came from is a constant offset from the
+ original SP, then we can reconstruct the original SP just
+ by subtracting off that constant. */
+ if (frame_base->kind == pv_register
+ && frame_base->reg == S390_SP_REGNUM)
+ original_sp = get_frame_base (fi) - frame_base->k;
+ }
+
+ /* If the analysis said that the current SP value is the original
+ value less some constant, then that constant is the frame size. */
+ {
+ struct prologue_value *sp = &gpr[S390_SP_REGNUM - S390_R0_REGNUM];
+
+ if (sp->kind == pv_register
+ && sp->reg == S390_SP_REGNUM)
+ frame_size = -sp->k;
+ }
+
+ /* If we knew other registers' current values, we could check if
+ the analysis said any of those were related to the original SP
+ value, too. But for now, we'll just punt. */
+
+ /* If the caller passed in an 'extra info' structure, fill in the
+ parts we can. */
+ if (fextra_info)
+ {
+ if (init_extra_info || ! fextra_info->initialised)
+ {
+ s390_memset_extra_info (fextra_info);
+ fextra_info->function_start = start_pc;
+ fextra_info->initialised = 1;
+ }
+
+ if (frame_size != -1)
+ {
+ fextra_info->stack_bought_valid = 1;
+ fextra_info->stack_bought = frame_size;
+ }
+
+ /* Assume everything was okay, and indicate otherwise when we
+ find something amiss. */
+ fextra_info->good_prologue = 1;
+
+ if (using_frame_pointer)
+ /* Actually, nobody cares about the exact PC, so any
+ non-zero value will do here. */
+ fextra_info->frame_pointer_saved_pc = 1;
+
+ /* If we weren't able to find the size of the frame, or find
+ the original sp based on actual current register values,
+ then we're not going to be able to unwind this frame.
+
+ (If we're just doing prologue analysis to set a breakpoint,
+ then frame_size might be known, but original_sp unknown; if
+ we're analyzing a real frame which uses alloca, then
+ original_sp might be known (from the frame pointer
+ register), but the frame size might be unknown.) */
+ if (original_sp == -1 && frame_size == -1)
+ fextra_info->good_prologue = 0;
+
+ if (fextra_info->good_prologue)
+ fextra_info->skip_prologue_function_start
+ = after_last_frame_setup_insn;
+ else
+ /* If the prologue was too complex for us to make sense of,
+ then perhaps it's better to just not skip anything at
+ all. */
+ fextra_info->skip_prologue_function_start = start_pc;
+ }
+
+ /* Indicate where registers were saved on the stack, if:
+ - the caller seems to want to know,
+ - the caller provided an actual SP, and
+ - the analysis gave us enough information to actually figure it
+ out. */
+ if (fi
+ && deprecated_get_frame_saved_regs (fi)
+ && original_sp != -1)
+ {
+ int slot_num;
+ CORE_ADDR slot_addr;
+ CORE_ADDR *saved_regs = deprecated_get_frame_saved_regs (fi);
+
+ /* Scan the spill array; if a spill slot says it holds the
+ original value of some register, then record that slot's
+ address as the place that register was saved.
+
+ Just for kicks, note that, even if registers aren't saved
+ in their officially-sanctioned slots, this will still work
+ --- we know what really got put where. */
+
+ /* First, the slots for r2 -- r15. */
+ for (slot_num = 0, slot_addr = original_sp + 2 * S390_GPR_SIZE;
+ slot_num < 14;
+ slot_num++, slot_addr += S390_GPR_SIZE)
+ {
+ struct prologue_value *slot = &spill[slot_num];
+
+ if (slot->kind == pv_register
+ && slot->k == 0)
+ saved_regs[slot->reg] = slot_addr;
+ }
+
+ /* Then, the slots for f0, f2, f4, and f6. They're a
+ different size. */
+ for (slot_num = 14, slot_addr = original_sp + 16 * S390_GPR_SIZE;
+ slot_num < S390_NUM_SPILL_SLOTS;
+ slot_num++, slot_addr += S390_FPR_SIZE)
+ {
+ struct prologue_value *slot = &spill[slot_num];
+
+ if (slot->kind == pv_register
+ && slot->k == 0)
+ saved_regs[slot->reg] = slot_addr;
+ }
+
+ /* The stack pointer's element of saved_regs[] is special. */
+ saved_regs[S390_SP_REGNUM] = original_sp;
+ }
+ }
+
+ return result;
}
+/* Return true if we are in the functin's epilogue, i.e. after the
+ instruction that destroyed the function's stack frame. */
+static int
+s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+
+ /* In frameless functions, there's not frame to destroy and thus
+ we don't care about the epilogue.
+
+ In functions with frame, the epilogue sequence is a pair of
+ a LM-type instruction that restores (amongst others) the
+ return register %r14 and the stack pointer %r15, followed
+ by a branch 'br %r14' --or equivalent-- that effects the
+ actual return.
-int
+ In that situation, this function needs to return 'true' in
+ exactly one case: when pc points to that branch instruction.
+
+ Thus we try to disassemble the one instructions immediately
+ preceeding pc and check whether it is an LM-type instruction
+ modifying the stack pointer.
+
+ Note that disassembling backwards is not reliable, so there
+ is a slight chance of false positives here ... */
+
+ bfd_byte insn[6];
+ unsigned int r1, r3, b2;
+ int d2;
+
+ if (word_size == 4
+ && !read_memory_nobpt (pc - 4, insn, 4)
+ && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ if (word_size == 8
+ && !read_memory_nobpt (pc - 6, insn, 6)
+ && is_rse (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
+ && r3 == S390_SP_REGNUM - S390_R0_REGNUM)
+ return 1;
+
+ return 0;
+}
+
+static int
s390_check_function_end (CORE_ADDR pc)
{
bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
int regidx, instrlen;
- info.read_memory_func = dis_asm_read_memory;
- instrlen = s390_readinstruction (instr, pc, &info);
+ instrlen = s390_readinstruction (instr, pc);
if (instrlen < 0)
return -1;
/* check for BR */
regidx = instr[1] & 0xf;
/* Check for LMG or LG */
instrlen =
- s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4), &info);
+ s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 6 : 4));
if (instrlen < 0)
return -1;
if (GDB_TARGET_IS_ESAME)
return 0;
if (regidx == 14)
return 1;
- instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8),
- &info);
+ instrlen = s390_readinstruction (instr, pc - (GDB_TARGET_IS_ESAME ? 12 : 8));
if (instrlen < 0)
return -1;
if (GDB_TARGET_IS_ESAME)
}
-
-CORE_ADDR
-s390_function_start (struct frame_info *fi)
-{
- CORE_ADDR function_start = 0;
-
- if (fi->extra_info && fi->extra_info->initialised)
- function_start = fi->extra_info->function_start;
- else if (fi->pc)
- function_start = get_pc_function_start (fi->pc);
- return function_start;
-}
-
-
-
-
-int
+static int
s390_frameless_function_invocation (struct frame_info *fi)
{
struct frame_extra_info fextra_info, *fextra_info_ptr;
int frameless = 0;
- if (fi->next == NULL) /* no may be frameless */
+ if (get_next_frame (fi) == NULL) /* no may be frameless */
{
- if (fi->extra_info)
- fextra_info_ptr = fi->extra_info;
+ if (get_frame_extra_info (fi))
+ fextra_info_ptr = get_frame_extra_info (fi);
else
{
fextra_info_ptr = &fextra_info;
- s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi),
+ s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
fextra_info_ptr, fi, 1);
}
- frameless = ((fextra_info_ptr->stack_bought == 0));
+ frameless = (fextra_info_ptr->stack_bought_valid
+ && fextra_info_ptr->stack_bought == 0);
}
return frameless;
CORE_ADDR *sregs, CORE_ADDR *sigcaller_pc)
{
bfd_byte instr[S390_MAX_INSTR_SIZE];
- disassemble_info info;
int instrlen;
CORE_ADDR scontext;
int retval = 0;
scontext = temp_sregs = 0;
- info.read_memory_func = dis_asm_read_memory;
- instrlen = s390_readinstruction (instr, pc, &info);
+ instrlen = s390_readinstruction (instr, pc);
if (sigcaller_pc)
*sigcaller_pc = 0;
if (((instrlen == S390_SYSCALL_SIZE) &&
if (sighandler_fi)
{
if (s390_frameless_function_invocation (sighandler_fi))
- orig_sp = sighandler_fi->frame;
+ orig_sp = get_frame_base (sighandler_fi);
else
orig_sp = ADDR_BITS_REMOVE ((CORE_ADDR)
- read_memory_integer (sighandler_fi->
- frame,
+ read_memory_integer (get_frame_base (sighandler_fi),
S390_GPR_SIZE));
if (orig_sp && sigcaller_pc)
{
*sigcaller_pc =
ADDR_BITS_REMOVE ((CORE_ADDR)
read_memory_integer (temp_sregs +
- REGISTER_BYTE
- (S390_PC_REGNUM),
- S390_PSW_ADDR_SIZE));
+ DEPRECATED_REGISTER_BYTE (S390_PSWA_REGNUM),
+ S390_GPR_SIZE));
}
}
retval = 1;
for the moment.
For some reason the blockframe.c calls us with fi->next->fromleaf
so this seems of little use to us. */
-void
+static CORE_ADDR
s390_init_frame_pc_first (int next_fromleaf, struct frame_info *fi)
{
CORE_ADDR sigcaller_pc;
-
- fi->pc = 0;
+ CORE_ADDR pc = 0;
if (next_fromleaf)
{
- fi->pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
+ pc = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
/* fix signal handlers */
}
- else if (fi->next && fi->next->pc)
- fi->pc = s390_frame_saved_pc_nofix (fi->next);
- if (fi->pc && fi->next && fi->next->frame &&
- s390_is_sigreturn (fi->pc, fi->next, NULL, &sigcaller_pc))
+ else if (get_next_frame (fi) && get_frame_pc (get_next_frame (fi)))
+ pc = s390_frame_saved_pc_nofix (get_next_frame (fi));
+ if (pc && get_next_frame (fi) && get_frame_base (get_next_frame (fi))
+ && s390_is_sigreturn (pc, get_next_frame (fi), NULL, &sigcaller_pc))
{
- fi->pc = sigcaller_pc;
+ pc = sigcaller_pc;
}
-
+ return pc;
}
-void
+static void
s390_init_extra_frame_info (int fromleaf, struct frame_info *fi)
{
- fi->extra_info = frame_obstack_alloc (sizeof (struct frame_extra_info));
- if (fi->pc)
- s390_get_frame_info (s390_sniff_pc_function_start (fi->pc, fi),
- fi->extra_info, fi, 1);
+ frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
+ if (get_frame_pc (fi))
+ s390_get_frame_info (s390_sniff_pc_function_start (get_frame_pc (fi), fi),
+ get_frame_extra_info (fi), fi, 1);
else
- s390_memset_extra_info (fi->extra_info);
+ s390_memset_extra_info (get_frame_extra_info (fi));
}
/* If saved registers of frame FI are not known yet, read and cache them.
&FEXTRA_INFOP contains struct frame_extra_info; TDATAP can be NULL,
in which case the framedata are read. */
-void
+static void
s390_frame_init_saved_regs (struct frame_info *fi)
{
int quick;
- if (fi->saved_regs == NULL)
+ if (deprecated_get_frame_saved_regs (fi) == NULL)
{
/* zalloc memsets the saved regs */
frame_saved_regs_zalloc (fi);
- if (fi->pc)
+ if (get_frame_pc (fi))
{
- quick = (fi->extra_info && fi->extra_info->initialised
- && fi->extra_info->good_prologue);
- s390_get_frame_info (quick ? fi->extra_info->function_start :
- s390_sniff_pc_function_start (fi->pc, fi),
- fi->extra_info, fi, !quick);
+ quick = (get_frame_extra_info (fi)
+ && get_frame_extra_info (fi)->initialised
+ && get_frame_extra_info (fi)->good_prologue);
+ s390_get_frame_info (quick
+ ? get_frame_extra_info (fi)->function_start
+ : s390_sniff_pc_function_start (get_frame_pc (fi), fi),
+ get_frame_extra_info (fi), fi, !quick);
}
}
}
-CORE_ADDR
-s390_frame_args_address (struct frame_info *fi)
-{
-
- /* Apparently gdb already knows gdb_args_offset itself */
- return fi->frame;
-}
-
-
static CORE_ADDR
s390_frame_saved_pc_nofix (struct frame_info *fi)
{
- if (fi->extra_info && fi->extra_info->saved_pc_valid)
- return fi->extra_info->saved_pc;
+ if (get_frame_extra_info (fi) && get_frame_extra_info (fi)->saved_pc_valid)
+ return get_frame_extra_info (fi)->saved_pc;
- if (generic_find_dummy_frame (fi->pc, fi->frame))
- return generic_read_register_dummy (fi->pc, fi->frame, S390_PC_REGNUM);
+ if (deprecated_generic_find_dummy_frame (get_frame_pc (fi),
+ get_frame_base (fi)))
+ return deprecated_read_register_dummy (get_frame_pc (fi),
+ get_frame_base (fi), S390_PC_REGNUM);
s390_frame_init_saved_regs (fi);
- if (fi->extra_info)
+ if (get_frame_extra_info (fi))
{
- fi->extra_info->saved_pc_valid = 1;
- if (fi->extra_info->good_prologue)
- {
- if (fi->saved_regs[S390_RETADDR_REGNUM])
- {
- return (fi->extra_info->saved_pc =
- ADDR_BITS_REMOVE (read_memory_integer
- (fi->saved_regs[S390_RETADDR_REGNUM],
- S390_GPR_SIZE)));
- }
- else
- return read_register (S390_RETADDR_REGNUM);
- }
+ get_frame_extra_info (fi)->saved_pc_valid = 1;
+ if (get_frame_extra_info (fi)->good_prologue
+ && deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM])
+ get_frame_extra_info (fi)->saved_pc
+ = ADDR_BITS_REMOVE (read_memory_integer
+ (deprecated_get_frame_saved_regs (fi)[S390_RETADDR_REGNUM],
+ S390_GPR_SIZE));
+ else
+ get_frame_extra_info (fi)->saved_pc
+ = ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
+ return get_frame_extra_info (fi)->saved_pc;
}
return 0;
}
-CORE_ADDR
+static CORE_ADDR
s390_frame_saved_pc (struct frame_info *fi)
{
CORE_ADDR saved_pc = 0, sig_pc;
- if (fi->extra_info && fi->extra_info->sig_fixed_saved_pc_valid)
- return fi->extra_info->sig_fixed_saved_pc;
+ if (get_frame_extra_info (fi)
+ && get_frame_extra_info (fi)->sig_fixed_saved_pc_valid)
+ return get_frame_extra_info (fi)->sig_fixed_saved_pc;
saved_pc = s390_frame_saved_pc_nofix (fi);
- if (fi->extra_info)
+ if (get_frame_extra_info (fi))
{
- fi->extra_info->sig_fixed_saved_pc_valid = 1;
+ get_frame_extra_info (fi)->sig_fixed_saved_pc_valid = 1;
if (saved_pc)
{
if (s390_is_sigreturn (saved_pc, fi, NULL, &sig_pc))
saved_pc = sig_pc;
}
- fi->extra_info->sig_fixed_saved_pc = saved_pc;
+ get_frame_extra_info (fi)->sig_fixed_saved_pc = saved_pc;
}
return saved_pc;
}
-/* We want backtraces out of signal handlers so we don't
- set thisframe->signal_handler_caller to 1 */
+/* We want backtraces out of signal handlers so we don't set
+ (get_frame_type (thisframe) == SIGTRAMP_FRAME) to 1 */
-CORE_ADDR
+static CORE_ADDR
s390_frame_chain (struct frame_info *thisframe)
{
CORE_ADDR prev_fp = 0;
- if (thisframe->prev && thisframe->prev->frame)
- prev_fp = thisframe->prev->frame;
- else if (generic_find_dummy_frame (thisframe->pc, thisframe->frame))
- return generic_read_register_dummy (thisframe->pc, thisframe->frame,
- S390_SP_REGNUM);
+ if (deprecated_generic_find_dummy_frame (get_frame_pc (thisframe),
+ get_frame_base (thisframe)))
+ return deprecated_read_register_dummy (get_frame_pc (thisframe),
+ get_frame_base (thisframe),
+ S390_SP_REGNUM);
else
{
int sigreturn = 0;
struct frame_extra_info prev_fextra_info;
memset (&prev_fextra_info, 0, sizeof (prev_fextra_info));
- if (thisframe->pc)
+ if (get_frame_pc (thisframe))
{
CORE_ADDR saved_pc, sig_pc;
{
/* read sigregs,regs.gprs[11 or 15] */
prev_fp = read_memory_integer (sregs +
- REGISTER_BYTE (S390_GP0_REGNUM +
+ DEPRECATED_REGISTER_BYTE (S390_R0_REGNUM +
(prev_fextra_info.
frame_pointer_saved_pc
? 11 : 15)),
S390_GPR_SIZE);
- thisframe->extra_info->sigcontext = sregs;
+ get_frame_extra_info (thisframe)->sigcontext = sregs;
}
else
{
- if (thisframe->saved_regs)
+ if (deprecated_get_frame_saved_regs (thisframe))
{
int regno;
if (prev_fextra_info.frame_pointer_saved_pc
- && thisframe->saved_regs[S390_FRAME_REGNUM])
+ && deprecated_get_frame_saved_regs (thisframe)[S390_FRAME_REGNUM])
regno = S390_FRAME_REGNUM;
else
regno = S390_SP_REGNUM;
- if (thisframe->saved_regs[regno])
+ if (deprecated_get_frame_saved_regs (thisframe)[regno])
{
/* The SP's entry of `saved_regs' is special. */
if (regno == S390_SP_REGNUM)
- prev_fp = thisframe->saved_regs[regno];
+ prev_fp = deprecated_get_frame_saved_regs (thisframe)[regno];
else
prev_fp =
- read_memory_integer (thisframe->saved_regs[regno],
+ read_memory_integer (deprecated_get_frame_saved_regs (thisframe)[regno],
S390_GPR_SIZE);
}
}
out as our frames are similar to rs6000 there is a possibility
i386 dosen't need it. */
-
-
-/* a given return value in `regbuf' with a type `valtype', extract and copy its
- value into `valbuf' */
-void
-s390_extract_return_value (struct type *valtype, char *regbuf, char *valbuf)
-{
- /* floats and doubles are returned in fpr0. fpr's have a size of 8 bytes.
- We need to truncate the return value into float size (4 byte) if
- necessary. */
- int len = TYPE_LENGTH (valtype);
-
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- memcpy (valbuf, ®buf[REGISTER_BYTE (S390_FP0_REGNUM)], len);
- else
- {
- int offset = 0;
- /* return value is copied starting from r2. */
- if (TYPE_LENGTH (valtype) < S390_GPR_SIZE)
- offset = S390_GPR_SIZE - TYPE_LENGTH (valtype);
- memcpy (valbuf,
- regbuf + REGISTER_BYTE (S390_GP0_REGNUM + 2) + offset,
- TYPE_LENGTH (valtype));
- }
-}
-
-
-static char *
-s390_promote_integer_argument (struct type *valtype, char *valbuf,
- char *reg_buff, int *arglen)
-{
- char *value = valbuf;
- int len = TYPE_LENGTH (valtype);
-
- if (len < S390_GPR_SIZE)
- {
- /* We need to upgrade this value to a register to pass it correctly */
- int idx, diff = S390_GPR_SIZE - len, negative =
- (!TYPE_UNSIGNED (valtype) && value[0] & 0x80);
- for (idx = 0; idx < S390_GPR_SIZE; idx++)
- {
- reg_buff[idx] = (idx < diff ? (negative ? 0xff : 0x0) :
- value[idx - diff]);
- }
- value = reg_buff;
- *arglen = S390_GPR_SIZE;
- }
- else
- {
- if (len & (S390_GPR_SIZE - 1))
- {
- fprintf_unfiltered (gdb_stderr,
- "s390_promote_integer_argument detected an argument not "
- "a multiple of S390_GPR_SIZE & greater than S390_GPR_SIZE "
- "we might not deal with this correctly.\n");
- }
- *arglen = len;
- }
-
- return (value);
-}
-
-void
-s390_store_return_value (struct type *valtype, char *valbuf)
-{
- int arglen;
- char *reg_buff = alloca (max (S390_FPR_SIZE, REGISTER_SIZE)), *value;
-
- if (TYPE_CODE (valtype) == TYPE_CODE_FLT)
- {
- if (TYPE_LENGTH (valtype) == 4
- || TYPE_LENGTH (valtype) == 8)
- write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM), valbuf,
- TYPE_LENGTH (valtype));
- else
- error ("GDB is unable to return `long double' values "
- "on this architecture.");
- }
- else
- {
- value =
- s390_promote_integer_argument (valtype, valbuf, reg_buff, &arglen);
- /* Everything else is returned in GPR2 and up. */
- write_register_bytes (REGISTER_BYTE (S390_GP0_REGNUM + 2), value,
- arglen);
- }
-}
-static int
-gdb_print_insn_s390 (bfd_vma memaddr, disassemble_info * info)
-{
- bfd_byte instrbuff[S390_MAX_INSTR_SIZE];
- int instrlen, cnt;
-
- instrlen = s390_readinstruction (instrbuff, (CORE_ADDR) memaddr, info);
- if (instrlen < 0)
- {
- (*info->memory_error_func) (instrlen, memaddr, info);
- return -1;
- }
- for (cnt = 0; cnt < instrlen; cnt++)
- info->fprintf_func (info->stream, "%02X ", instrbuff[cnt]);
- for (cnt = instrlen; cnt < S390_MAX_INSTR_SIZE; cnt++)
- info->fprintf_func (info->stream, " ");
- instrlen = print_insn_s390 (memaddr, info);
- return instrlen;
-}
-
-
-
/* Not the most efficent code in the world */
-int
-s390_fp_regnum ()
+static int
+s390_fp_regnum (void)
{
int regno = S390_SP_REGNUM;
struct frame_extra_info fextra_info;
return regno;
}
-CORE_ADDR
-s390_read_fp ()
+static CORE_ADDR
+s390_read_fp (void)
{
return read_register (s390_fp_regnum ());
}
-void
-s390_write_fp (CORE_ADDR val)
-{
- write_register (s390_fp_regnum (), val);
-}
-
-
static void
s390_pop_frame_regular (struct frame_info *frame)
{
int regnum;
- write_register (S390_PC_REGNUM, FRAME_SAVED_PC (frame));
+ write_register (S390_PC_REGNUM, DEPRECATED_FRAME_SAVED_PC (frame));
/* Restore any saved registers. */
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- if (frame->saved_regs[regnum] != 0)
- {
- ULONGEST value;
-
- value = read_memory_unsigned_integer (frame->saved_regs[regnum],
- REGISTER_RAW_SIZE (regnum));
- write_register (regnum, value);
- }
+ if (deprecated_get_frame_saved_regs (frame))
+ {
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ if (deprecated_get_frame_saved_regs (frame)[regnum] != 0)
+ {
+ ULONGEST value;
+
+ value = read_memory_unsigned_integer (deprecated_get_frame_saved_regs (frame)[regnum],
+ DEPRECATED_REGISTER_RAW_SIZE (regnum));
+ write_register (regnum, value);
+ }
- /* Actually cut back the stack. Remember that the SP's element of
- saved_regs is the old SP itself, not the address at which it is
- saved. */
- write_register (S390_SP_REGNUM, frame->saved_regs[S390_SP_REGNUM]);
+ /* Actually cut back the stack. Remember that the SP's element of
+ saved_regs is the old SP itself, not the address at which it is
+ saved. */
+ write_register (S390_SP_REGNUM, deprecated_get_frame_saved_regs (frame)[S390_SP_REGNUM]);
+ }
/* Throw away any cached frame information. */
flush_cached_frames ();
machine state that was in effect before the frame was created.
Used in the contexts of the "return" command, and of
target function calls from the debugger. */
-void
-s390_pop_frame ()
+static void
+s390_pop_frame (void)
{
/* This function checks for and handles generic dummy frames, and
calls back to our function for ordinary frames. */
}
+/* Dummy function calls. */
+
/* Return non-zero if TYPE is an integer-like type, zero otherwise.
"Integer-like" types are those that should be passed the way
integers are: integers, enums, ranges, characters, and booleans. */
|| code == TYPE_CODE_BOOL);
}
-
/* Return non-zero if TYPE is a pointer-like type, zero otherwise.
"Pointer-like" types are those that should be passed the way
pointers are: pointers and references. */
... and so on.
- WHY THE HECK DO WE CARE ABOUT THIS??? Well, it turns out that GCC
- passes all float singletons and double singletons as if they were
- simply floats or doubles. This is *not* what the ABI says it
- should do. */
+ All such structures are passed as if they were floats or doubles,
+ as the (revised) ABI says. */
static int
is_float_singleton (struct type *type)
{
- return (TYPE_CODE (type) == TYPE_CODE_STRUCT
- && TYPE_NFIELDS (type) == 1
- && (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) == TYPE_CODE_FLT
- || is_float_singleton (TYPE_FIELD_TYPE (type, 0))));
+ if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)
+ {
+ struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);
+ CHECK_TYPEDEF (singleton_type);
+
+ return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT
+ || is_float_singleton (singleton_type));
+ }
+
+ return 0;
}
You'd think this would just be floats, doubles, long doubles, etc.
But as an odd quirk, not mentioned in the ABI, GCC passes float and
double singletons as if they were a plain float, double, etc. (The
- corresponding union types are handled normally.) So we exclude
+ corresponding union types are handled normally.) So we include
those types here. *shrug* */
static int
is_float_like (struct type *type)
}
-/* Return non-zero if TYPE is considered a `DOUBLE_OR_FLOAT', as
- defined by the parameter passing conventions described in the
- "Linux for S/390 ELF Application Binary Interface Supplement".
- Otherwise, return zero. */
static int
-is_double_or_float (struct type *type)
+is_power_of_two (unsigned int n)
{
- return (is_float_like (type)
- && (TYPE_LENGTH (type) == 4
- || TYPE_LENGTH (type) == 8));
+ return ((n & (n - 1)) == 0);
}
-
-/* Return non-zero if TYPE is considered a `SIMPLE_ARG', as defined by
- the parameter passing conventions described in the "Linux for S/390
- ELF Application Binary Interface Supplement". Return zero otherwise. */
+/* Return non-zero if TYPE should be passed as a pointer to a copy,
+ zero otherwise. */
static int
-is_simple_arg (struct type *type)
+s390_function_arg_pass_by_reference (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 1;
- /* This is almost a direct translation of the ABI's language, except
- that we have to exclude 8-byte structs; those are DOUBLE_ARGs. */
- return ((is_integer_like (type) && length <= 4)
- || is_pointer_like (type)
- || (is_struct_like (type) && length != 8)
- || (is_float_like (type) && length == 16));
+ /* FIXME: All complex and vector types are also returned by reference. */
+ return is_struct_like (type) && !is_power_of_two (length);
}
-
-/* Return non-zero if TYPE should be passed as a pointer to a copy,
- zero otherwise. TYPE must be a SIMPLE_ARG, as recognized by
- `is_simple_arg'. */
+/* Return non-zero if TYPE should be passed in a float register
+ if possible. */
static int
-pass_by_copy_ref (struct type *type)
+s390_function_arg_float (struct type *type)
{
unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
- return ((is_struct_like (type) && length != 1 && length != 2 && length != 4)
- || (is_float_like (type) && length == 16));
+ return is_float_like (type);
}
+/* Return non-zero if TYPE should be passed in an integer register
+ (or a pair of integer registers) if possible. */
+static int
+s390_function_arg_integer (struct type *type)
+{
+ unsigned length = TYPE_LENGTH (type);
+ if (length > 8)
+ return 0;
+
+ return is_integer_like (type)
+ || is_pointer_like (type)
+ || (is_struct_like (type) && is_power_of_two (length));
+}
/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full
word as required for the ABI. */
}
-/* Return non-zero if TYPE is a `DOUBLE_ARG', as defined by the
- parameter passing conventions described in the "Linux for S/390 ELF
- Application Binary Interface Supplement". Return zero otherwise. */
-static int
-is_double_arg (struct type *type)
-{
- unsigned length = TYPE_LENGTH (type);
-
- return ((is_integer_like (type)
- || is_struct_like (type))
- && length == 8);
-}
-
-
-/* Round ADDR up to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_up (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return ((addr + n - 1) & -n);
-}
-
-
-/* Round ADDR down to the next N-byte boundary. N must be a power of
- two. */
-static CORE_ADDR
-round_down (CORE_ADDR addr, int n)
-{
- /* Check that N is really a power of two. */
- gdb_assert (n && (n & (n-1)) == 0);
- return (addr & -n);
-}
-
-
/* Return the alignment required by TYPE. */
static int
alignment_of (struct type *type)
/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
- place to be passed to a function, as specified by the "Linux for
- S/390 ELF Application Binary Interface Supplement".
+ place to be passed to a function, as specified by the "GNU/Linux
+ for S/390 ELF Application Binary Interface Supplement".
SP is the current stack pointer. We must put arguments, links,
padding, etc. whereever they belong, and return the new stack
Our caller has taken care of any type promotions needed to satisfy
prototypes or the old K&R argument-passing rules. */
-CORE_ADDR
-s390_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
+static CORE_ADDR
+s390_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
+ struct regcache *regcache, CORE_ADDR bp_addr,
+ int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ ULONGEST orig_sp;
int i;
- int pointer_size = (TARGET_PTR_BIT / TARGET_CHAR_BIT);
-
- /* The number of arguments passed by reference-to-copy. */
- int num_copies;
/* If the i'th argument is passed as a reference to a copy, then
copy_addr[i] is the address of the copy we made. */
CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));
/* Build the reference-to-copy area. */
- num_copies = 0;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = VALUE_TYPE (arg);
unsigned length = TYPE_LENGTH (type);
- if (is_simple_arg (type)
- && pass_by_copy_ref (type))
+ if (s390_function_arg_pass_by_reference (type))
{
sp -= length;
- sp = round_down (sp, alignment_of (type));
+ sp = align_down (sp, alignment_of (type));
write_memory (sp, VALUE_CONTENTS (arg), length);
copy_addr[i] = sp;
- num_copies++;
}
}
/* Reserve space for the parameter area. As a conservative
simplification, we assume that everything will be passed on the
- stack. */
- {
- int i;
-
- for (i = 0; i < nargs; i++)
- {
- struct value *arg = args[i];
- struct type *type = VALUE_TYPE (arg);
- int length = TYPE_LENGTH (type);
-
- sp = round_down (sp, alignment_of (type));
-
- /* SIMPLE_ARG values get extended to 32 bits. Assume every
- argument is. */
- if (length < 4) length = 4;
- sp -= length;
- }
- }
+ stack. Since every argument larger than 8 bytes will be
+ passed by reference, we use this simple upper bound. */
+ sp -= nargs * 8;
- /* Include space for any reference-to-copy pointers. */
- sp = round_down (sp, pointer_size);
- sp -= num_copies * pointer_size;
-
/* After all that, make sure it's still aligned on an eight-byte
boundary. */
- sp = round_down (sp, 8);
+ sp = align_down (sp, 8);
/* Finally, place the actual parameters, working from SP towards
higher addresses. The code above is supposed to reserve enough
int gr = 2;
CORE_ADDR starg = sp;
+ /* A struct is returned using general register 2. */
+ if (struct_return)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ struct_addr);
+ gr++;
+ }
+
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = VALUE_TYPE (arg);
-
- if (is_double_or_float (type)
- && fr <= 2)
- {
- /* When we store a single-precision value in an FP register,
- it occupies the leftmost bits. */
- write_register_bytes (REGISTER_BYTE (S390_FP0_REGNUM + fr),
- VALUE_CONTENTS (arg),
- TYPE_LENGTH (type));
- fr += 2;
- }
- else if (is_simple_arg (type)
- && gr <= 6)
- {
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_register (S390_GP0_REGNUM + gr, copy_addr[i]);
- else
- write_register (S390_GP0_REGNUM + gr, extend_simple_arg (arg));
-
- gr++;
- }
- else if (is_double_arg (type)
- && gr <= 5)
- {
- write_register_gen (S390_GP0_REGNUM + gr,
- VALUE_CONTENTS (arg));
- write_register_gen (S390_GP0_REGNUM + gr + 1,
- VALUE_CONTENTS (arg) + 4);
- gr += 2;
- }
- else
- {
- /* The `OTHER' case. */
- enum type_code code = TYPE_CODE (type);
- unsigned length = TYPE_LENGTH (type);
-
- /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
- in it, then don't go back and use it again later. */
- if (is_double_arg (type) && gr == 6)
- gr = 7;
-
- if (is_simple_arg (type))
- {
- /* Simple args are always either extended to 32 bits,
- or pointers. */
- starg = round_up (starg, 4);
-
- /* Do we need to pass a pointer to our copy of this
- argument? */
- if (pass_by_copy_ref (type))
- write_memory_signed_integer (starg, pointer_size,
- copy_addr[i]);
- else
- /* Simple args are always extended to 32 bits. */
- write_memory_signed_integer (starg, 4,
- extend_simple_arg (arg));
- starg += 4;
- }
- else
- {
- /* You'd think we should say:
- starg = round_up (starg, alignment_of (type));
- Unfortunately, GCC seems to simply align the stack on
- a four-byte boundary, even when passing doubles. */
- starg = round_up (starg, 4);
- write_memory (starg, VALUE_CONTENTS (arg), length);
- starg += length;
- }
- }
+ unsigned length = TYPE_LENGTH (type);
+
+ if (s390_function_arg_pass_by_reference (type))
+ {
+ if (gr <= 6)
+ {
+ regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,
+ copy_addr[i]);
+ gr++;
+ }
+ else
+ {
+ write_memory_unsigned_integer (starg, word_size, copy_addr[i]);
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_float (type))
+ {
+ /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,
+ the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */
+ if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,
+ 0, length, VALUE_CONTENTS (arg));
+ fr += 2;
+ }
+ else
+ {
+ /* When we store a single-precision value in a stack slot,
+ it occupies the rightmost bits. */
+ starg = align_up (starg + length, word_size);
+ write_memory (starg - length, VALUE_CONTENTS (arg), length);
+ }
+ }
+ else if (s390_function_arg_integer (type) && length <= word_size)
+ {
+ if (gr <= 6)
+ {
+ /* Integer arguments are always extended to word size. */
+ regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,
+ extend_simple_arg (arg));
+ gr++;
+ }
+ else
+ {
+ /* Integer arguments are always extended to word size. */
+ write_memory_signed_integer (starg, word_size,
+ extend_simple_arg (arg));
+ starg += word_size;
+ }
+ }
+ else if (s390_function_arg_integer (type) && length == 2*word_size)
+ {
+ if (gr <= 5)
+ {
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr,
+ VALUE_CONTENTS (arg));
+ regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,
+ VALUE_CONTENTS (arg) + word_size);
+ gr += 2;
+ }
+ else
+ {
+ /* If we skipped r6 because we couldn't fit a DOUBLE_ARG
+ in it, then don't go back and use it again later. */
+ gr = 7;
+
+ write_memory (starg, VALUE_CONTENTS (arg), length);
+ starg += length;
+ }
+ }
+ else
+ internal_error (__FILE__, __LINE__, "unknown argument type");
}
}
/* Allocate the standard frame areas: the register save area, the
word reserved for the compiler (which seems kind of meaningless),
and the back chain pointer. */
- sp -= 96;
+ sp -= 16*word_size + 32;
/* Write the back chain pointer into the first word of the stack
- frame. This will help us get backtraces from within functions
- called from GDB. */
- write_memory_unsigned_integer (sp, (TARGET_PTR_BIT / TARGET_CHAR_BIT),
- read_fp ());
+ frame. This is needed to unwind across a dummy frame. */
+ regcache_cooked_read_unsigned (regcache, S390_SP_REGNUM, &orig_sp);
+ write_memory_unsigned_integer (sp, word_size, orig_sp);
+ /* Store return address. */
+ regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
+
+ /* Store updated stack pointer. */
+ regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);
+
+ /* Return stack pointer. */
return sp;
}
-
-static int
-s390_use_struct_convention (int gcc_p, struct type *value_type)
+/* Assuming NEXT_FRAME->prev is a dummy, return the frame ID of that
+ dummy frame. The frame ID's base needs to match the TOS value
+ returned by push_dummy_call, and the PC match the dummy frame's
+ breakpoint. */
+static struct frame_id
+s390_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame)
{
- enum type_code code = TYPE_CODE (value_type);
-
- return (code == TYPE_CODE_STRUCT
- || code == TYPE_CODE_UNION);
+ ULONGEST sp;
+ frame_unwind_unsigned_register (next_frame, S390_SP_REGNUM, &sp);
+ return frame_id_build (sp, frame_pc_unwind (next_frame));
}
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-struct type *
-s390_register_virtual_type (int regno)
+static CORE_ADDR
+s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
{
- return ((unsigned) regno - S390_FPC_REGNUM) <
- S390_NUM_FPRS ? builtin_type_double : builtin_type_int;
+ /* Both the 32- and 64-bit ABI's say that the stack pointer should
+ always be aligned on an eight-byte boundary. */
+ return (addr & -8);
}
-struct type *
-s390x_register_virtual_type (int regno)
+/* Function return value access. */
+
+static enum return_value_convention
+s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)
{
- return (regno == S390_FPC_REGNUM) ||
- (regno >= S390_FIRST_ACR && regno <= S390_LAST_ACR) ? builtin_type_int :
- (regno >= S390_FP0_REGNUM) ? builtin_type_double : builtin_type_long;
-}
+ int length = TYPE_LENGTH (type);
+ if (length > 8)
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ case TYPE_CODE_ARRAY:
+ return RETURN_VALUE_STRUCT_CONVENTION;
+ default:
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+}
-void
-s390_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+static enum return_value_convention
+s390_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *out, const void *in)
{
- write_register (S390_GP0_REGNUM + 2, addr);
-}
+ int word_size = gdbarch_ptr_bit (gdbarch) / 8;
+ int length = TYPE_LENGTH (type);
+ enum return_value_convention rvc =
+ s390_return_value_convention (gdbarch, type);
+ if (in)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_write_part (regcache, S390_F0_REGNUM,
+ 0, length, in);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments are always extended to word size. */
+ if (TYPE_UNSIGNED (type))
+ regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,
+ extract_unsigned_integer (in, length));
+ else
+ regcache_cooked_write_signed (regcache, S390_R2_REGNUM,
+ extract_signed_integer (in, length));
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_write (regcache, S390_R2_REGNUM, in);
+ regcache_cooked_write (regcache, S390_R3_REGNUM,
+ (const char *)in + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, "invalid return type");
+ break;
+
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error ("Cannot set function return value.");
+ break;
+ }
+ }
+ else if (out)
+ {
+ switch (rvc)
+ {
+ case RETURN_VALUE_REGISTER_CONVENTION:
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ /* When we store a single-precision value in an FP register,
+ it occupies the leftmost bits. */
+ regcache_cooked_read_part (regcache, S390_F0_REGNUM,
+ 0, length, out);
+ }
+ else if (length <= word_size)
+ {
+ /* Integer arguments occupy the rightmost bits. */
+ regcache_cooked_read_part (regcache, S390_R2_REGNUM,
+ word_size - length, length, out);
+ }
+ else if (length == 2*word_size)
+ {
+ regcache_cooked_read (regcache, S390_R2_REGNUM, out);
+ regcache_cooked_read (regcache, S390_R3_REGNUM,
+ (char *)out + word_size);
+ }
+ else
+ internal_error (__FILE__, __LINE__, "invalid return type");
+ break;
+
+ case RETURN_VALUE_STRUCT_CONVENTION:
+ error ("Function return value unknown.");
+ break;
+ }
+ }
+ return rvc;
+}
-static unsigned char *
+static const unsigned char *
s390_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
{
static unsigned char breakpoint[] = { 0x0, 0x1 };
/* Advance PC across any function entry prologue instructions to reach some
"real" code. */
-CORE_ADDR
+static CORE_ADDR
s390_skip_prologue (CORE_ADDR pc)
{
struct frame_extra_info fextra_info;
Can't go through the frames for this because on some machines
the new frame is not set up until the new function executes
some instructions. */
-CORE_ADDR
+static CORE_ADDR
s390_saved_pc_after_call (struct frame_info *frame)
{
return ADDR_BITS_REMOVE (read_register (S390_RETADDR_REGNUM));
return (addr) & 0x7fffffff;
}
+static int
+s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
+{
+ if (byte_size == 4)
+ return TYPE_FLAG_ADDRESS_CLASS_1;
+ else
+ return 0;
+}
-static CORE_ADDR
-s390_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+static const char *
+s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
{
- write_register (S390_RETADDR_REGNUM, CALL_DUMMY_ADDRESS ());
- return sp;
+ if (type_flags & TYPE_FLAG_ADDRESS_CLASS_1)
+ return "mode32";
+ else
+ return NULL;
+}
+
+static int
+s390_address_class_name_to_type_flags (struct gdbarch *gdbarch, const char *name,
+ int *type_flags_ptr)
+{
+ if (strcmp (name, "mode32") == 0)
+ {
+ *type_flags_ptr = TYPE_FLAG_ADDRESS_CLASS_1;
+ return 1;
+ }
+ else
+ return 0;
}
-struct gdbarch *
+static struct gdbarch *
s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
{
- static LONGEST s390_call_dummy_words[] = { 0 };
struct gdbarch *gdbarch;
struct gdbarch_tdep *tdep;
- int elf_flags;
/* First see if there is already a gdbarch that can satisfy the request. */
arches = gdbarch_list_lookup_by_info (arches, &info);
return NULL; /* No; then it's not for us. */
/* Yes: create a new gdbarch for the specified machine type. */
- gdbarch = gdbarch_alloc (&info, NULL);
+ tdep = XCALLOC (1, struct gdbarch_tdep);
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
+ ready to unwind the PC first (see frame.c:get_prev_frame()). */
+ set_gdbarch_deprecated_init_frame_pc (gdbarch, deprecated_init_frame_pc_default);
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
+ set_gdbarch_char_signed (gdbarch, 0);
- set_gdbarch_frame_args_skip (gdbarch, 0);
- set_gdbarch_frame_args_address (gdbarch, s390_frame_args_address);
- set_gdbarch_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
- set_gdbarch_frame_locals_address (gdbarch, s390_frame_args_address);
- /* We can't do this */
- set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
- set_gdbarch_store_struct_return (gdbarch, s390_store_struct_return);
- set_gdbarch_extract_return_value (gdbarch, s390_extract_return_value);
- set_gdbarch_store_return_value (gdbarch, s390_store_return_value);
- /* Amount PC must be decremented by after a breakpoint.
- This is often the number of bytes in BREAKPOINT
- but not always. */
+ set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
+ set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, s390_frame_init_saved_regs);
+ /* Amount PC must be decremented by after a breakpoint. This is
+ often the number of bytes returned by BREAKPOINT_FROM_PC but not
+ always. */
set_gdbarch_decr_pc_after_break (gdbarch, 2);
- set_gdbarch_pop_frame (gdbarch, s390_pop_frame);
- set_gdbarch_ieee_float (gdbarch, 1);
+ set_gdbarch_deprecated_pop_frame (gdbarch, s390_pop_frame);
/* Stack grows downward. */
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
- /* Offset from address of function to start of its code.
- Zero on most machines. */
- set_gdbarch_function_start_offset (gdbarch, 0);
- set_gdbarch_max_register_raw_size (gdbarch, 8);
- set_gdbarch_max_register_virtual_size (gdbarch, 8);
set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
- set_gdbarch_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
- set_gdbarch_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
- set_gdbarch_read_fp (gdbarch, s390_read_fp);
- set_gdbarch_write_fp (gdbarch, s390_write_fp);
+ set_gdbarch_deprecated_init_extra_frame_info (gdbarch, s390_init_extra_frame_info);
+ set_gdbarch_deprecated_init_frame_pc_first (gdbarch, s390_init_frame_pc_first);
+ set_gdbarch_deprecated_target_read_fp (gdbarch, s390_read_fp);
+ set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);
/* This function that tells us whether the function invocation represented
by FI does not have a frame on the stack associated with it. If it
does not, FRAMELESS is set to 1, else 0. */
- set_gdbarch_frameless_function_invocation (gdbarch,
- s390_frameless_function_invocation);
+ set_gdbarch_deprecated_frameless_function_invocation (gdbarch, s390_frameless_function_invocation);
/* Return saved PC from a frame */
- set_gdbarch_frame_saved_pc (gdbarch, s390_frame_saved_pc);
- /* FRAME_CHAIN takes a frame's nominal address
- and produces the frame's chain-pointer. */
- set_gdbarch_frame_chain (gdbarch, s390_frame_chain);
- set_gdbarch_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
- set_gdbarch_register_byte (gdbarch, s390_register_byte);
+ set_gdbarch_deprecated_frame_saved_pc (gdbarch, s390_frame_saved_pc);
+ /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and
+ produces the frame's chain-pointer. */
+ set_gdbarch_deprecated_frame_chain (gdbarch, s390_frame_chain);
+ set_gdbarch_deprecated_saved_pc_after_call (gdbarch, s390_saved_pc_after_call);
set_gdbarch_pc_regnum (gdbarch, S390_PC_REGNUM);
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
- set_gdbarch_fp_regnum (gdbarch, S390_FP_REGNUM);
- set_gdbarch_fp0_regnum (gdbarch, S390_FP0_REGNUM);
+ set_gdbarch_deprecated_fp_regnum (gdbarch, S390_SP_REGNUM);
+ set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
- set_gdbarch_cannot_fetch_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_cannot_store_register (gdbarch, s390_cannot_fetch_register);
- set_gdbarch_get_saved_register (gdbarch, generic_get_saved_register);
- set_gdbarch_use_struct_convention (gdbarch, s390_use_struct_convention);
- set_gdbarch_frame_chain_valid (gdbarch, func_frame_chain_valid);
+ set_gdbarch_num_pseudo_regs (gdbarch, S390_NUM_PSEUDO_REGS);
set_gdbarch_register_name (gdbarch, s390_register_name);
- set_gdbarch_stab_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_stab_reg_to_regnum);
- set_gdbarch_extract_struct_value_address
- (gdbarch, generic_cannot_extract_struct_value_address);
-
- /* Parameters for inferior function calls. */
- set_gdbarch_call_dummy_p (gdbarch, 1);
- set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
- set_gdbarch_call_dummy_length (gdbarch, 0);
- set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
- set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
- set_gdbarch_call_dummy_start_offset (gdbarch, 0);
- set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_at_entry_point);
- set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
- set_gdbarch_push_arguments (gdbarch, s390_push_arguments);
- set_gdbarch_save_dummy_frame_tos (gdbarch, generic_save_dummy_frame_tos);
- set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
- set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
- set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
- set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
- set_gdbarch_push_return_address (gdbarch, s390_push_return_address);
- set_gdbarch_sizeof_call_dummy_words (gdbarch,
- sizeof (s390_call_dummy_words));
- set_gdbarch_call_dummy_words (gdbarch, s390_call_dummy_words);
- set_gdbarch_coerce_float_to_double (gdbarch,
- standard_coerce_float_to_double);
+ set_gdbarch_register_type (gdbarch, s390_register_type);
+ set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
+ set_gdbarch_convert_register_p (gdbarch, s390_convert_register_p);
+ set_gdbarch_register_to_value (gdbarch, s390_register_to_value);
+ set_gdbarch_value_to_register (gdbarch, s390_value_to_register);
+ set_gdbarch_register_reggroup_p (gdbarch, s390_register_reggroup_p);
+ set_gdbarch_regset_from_core_section (gdbarch,
+ s390_regset_from_core_section);
+
+ /* Inferior function calls. */
+ set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
+ set_gdbarch_unwind_dummy_id (gdbarch, s390_unwind_dummy_id);
+ set_gdbarch_frame_align (gdbarch, s390_frame_align);
+ set_gdbarch_return_value (gdbarch, s390_return_value);
switch (info.bfd_arch_info->mach)
{
- case bfd_mach_s390_esa:
- set_gdbarch_register_size (gdbarch, 4);
- set_gdbarch_register_raw_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch, s390_register_virtual_type);
+ case bfd_mach_s390_31:
+ tdep->abi = ABI_LINUX_S390;
+
+ tdep->gregset = &s390_gregset;
+ tdep->sizeof_gregset = s390_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
- set_gdbarch_register_bytes (gdbarch, S390_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
break;
- case bfd_mach_s390_esame:
- set_gdbarch_register_size (gdbarch, 8);
- set_gdbarch_register_raw_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_size (gdbarch, s390x_register_raw_size);
- set_gdbarch_register_virtual_type (gdbarch,
- s390x_register_virtual_type);
+ case bfd_mach_s390_64:
+ tdep->abi = ABI_LINUX_ZSERIES;
+
+ tdep->gregset = &s390x_gregset;
+ tdep->sizeof_gregset = s390x_sizeof_gregset;
+ tdep->fpregset = &s390_fpregset;
+ tdep->sizeof_fpregset = s390_sizeof_fpregset;
set_gdbarch_long_bit (gdbarch, 64);
set_gdbarch_long_long_bit (gdbarch, 64);
set_gdbarch_ptr_bit (gdbarch, 64);
- set_gdbarch_register_bytes (gdbarch, S390X_REGISTER_BYTES);
+ set_gdbarch_pseudo_register_read (gdbarch, s390x_pseudo_register_read);
+ set_gdbarch_pseudo_register_write (gdbarch, s390x_pseudo_register_write);
+ set_gdbarch_address_class_type_flags (gdbarch,
+ s390_address_class_type_flags);
+ set_gdbarch_address_class_type_flags_to_name (gdbarch,
+ s390_address_class_type_flags_to_name);
+ set_gdbarch_address_class_name_to_type_flags (gdbarch,
+ s390_address_class_name_to_type_flags);
break;
}
+ set_gdbarch_print_insn (gdbarch, print_insn_s390);
+
return gdbarch;
}
+extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
+
void
-_initialize_s390_tdep ()
+_initialize_s390_tdep (void)
{
/* Hook us into the gdbarch mechanism. */
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
- if (!tm_print_insn) /* Someone may have already set it */
- tm_print_insn = gdb_print_insn_s390;
}
-
-#endif /* GDBSERVER */