-/* Target-dependent code for the Acorn Risc Machine, for GDB, the GNU Debugger.
- Copyright (C) 1988, 1989, 1991, 1992, 1993, 1995, 1996
- Free Software Foundation, Inc.
+/* Common target dependent code for GDB on ARM systems.
+ Copyright 1988, 1989, 1991, 1992, 1993, 1995, 1996, 1998, 1999, 2000,
+ 2001, 2002 Free Software Foundation, Inc.
-This file is part of GDB.
+ This file is part of GDB.
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <ctype.h> /* XXX for isupper () */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcmd.h"
-
-/* Set to true if the 32-bit mode is in use. */
-
-int arm_apcs_32 = 1;
-
-CORE_ADDR
-arm_addr_bits_remove (val)
-CORE_ADDR val;
+#include "gdbcore.h"
+#include "symfile.h"
+#include "gdb_string.h"
+#include "dis-asm.h" /* For register flavors. */
+#include "regcache.h"
+#include "doublest.h"
+#include "value.h"
+#include "arch-utils.h"
+#include "solib-svr4.h"
+
+#include "arm-tdep.h"
+#include "gdb/sim-arm.h"
+
+#include "elf-bfd.h"
+#include "coff/internal.h"
+#include "elf/arm.h"
+
+#include "gdb_assert.h"
+
+static int arm_debug;
+
+/* Each OS has a different mechanism for accessing the various
+ registers stored in the sigcontext structure.
+
+ SIGCONTEXT_REGISTER_ADDRESS should be defined to the name (or
+ function pointer) which may be used to determine the addresses
+ of the various saved registers in the sigcontext structure.
+
+ For the ARM target, there are three parameters to this function.
+ The first is the pc value of the frame under consideration, the
+ second the stack pointer of this frame, and the last is the
+ register number to fetch.
+
+ If the tm.h file does not define this macro, then it's assumed that
+ no mechanism is needed and we define SIGCONTEXT_REGISTER_ADDRESS to
+ be 0.
+
+ When it comes time to multi-arching this code, see the identically
+ named machinery in ia64-tdep.c for an example of how it could be
+ done. It should not be necessary to modify the code below where
+ this macro is used. */
+
+#ifdef SIGCONTEXT_REGISTER_ADDRESS
+#ifndef SIGCONTEXT_REGISTER_ADDRESS_P
+#define SIGCONTEXT_REGISTER_ADDRESS_P() 1
+#endif
+#else
+#define SIGCONTEXT_REGISTER_ADDRESS(SP,PC,REG) 0
+#define SIGCONTEXT_REGISTER_ADDRESS_P() 0
+#endif
+
+/* Macros for setting and testing a bit in a minimal symbol that marks
+ it as Thumb function. The MSB of the minimal symbol's "info" field
+ is used for this purpose. This field is already being used to store
+ the symbol size, so the assumption is that the symbol size cannot
+ exceed 2^31.
+
+ MSYMBOL_SET_SPECIAL Actually sets the "special" bit.
+ MSYMBOL_IS_SPECIAL Tests the "special" bit in a minimal symbol.
+ MSYMBOL_SIZE Returns the size of the minimal symbol,
+ i.e. the "info" field with the "special" bit
+ masked out. */
+
+#define MSYMBOL_SET_SPECIAL(msym) \
+ MSYMBOL_INFO (msym) = (char *) (((long) MSYMBOL_INFO (msym)) \
+ | 0x80000000)
+
+#define MSYMBOL_IS_SPECIAL(msym) \
+ (((long) MSYMBOL_INFO (msym) & 0x80000000) != 0)
+
+#define MSYMBOL_SIZE(msym) \
+ ((long) MSYMBOL_INFO (msym) & 0x7fffffff)
+
+/* Number of different reg name sets (options). */
+static int num_flavor_options;
+
+/* We have more registers than the disassembler as gdb can print the value
+ of special registers as well.
+ The general register names are overwritten by whatever is being used by
+ the disassembler at the moment. We also adjust the case of cpsr and fps. */
+
+/* Initial value: Register names used in ARM's ISA documentation. */
+static char * arm_register_name_strings[] =
+{"r0", "r1", "r2", "r3", /* 0 1 2 3 */
+ "r4", "r5", "r6", "r7", /* 4 5 6 7 */
+ "r8", "r9", "r10", "r11", /* 8 9 10 11 */
+ "r12", "sp", "lr", "pc", /* 12 13 14 15 */
+ "f0", "f1", "f2", "f3", /* 16 17 18 19 */
+ "f4", "f5", "f6", "f7", /* 20 21 22 23 */
+ "fps", "cpsr" }; /* 24 25 */
+static char **arm_register_names = arm_register_name_strings;
+
+/* Valid register name flavors. */
+static const char **valid_flavors;
+
+/* Disassembly flavor to use. Default to "std" register names. */
+static const char *disassembly_flavor;
+/* Index to that option in the opcodes table. */
+static int current_option;
+
+/* This is used to keep the bfd arch_info in sync with the disassembly
+ flavor. */
+static void set_disassembly_flavor_sfunc(char *, int,
+ struct cmd_list_element *);
+static void set_disassembly_flavor (void);
+
+static void convert_from_extended (void *ptr, void *dbl);
+
+/* Define other aspects of the stack frame. We keep the offsets of
+ all saved registers, 'cause we need 'em a lot! We also keep the
+ current size of the stack frame, and the offset of the frame
+ pointer from the stack pointer (for frameless functions, and when
+ we're still in the prologue of a function with a frame). */
+
+struct frame_extra_info
{
- return (val & (arm_apcs_32 ? 0xfffffffc : 0x03fffffc));
-}
-
-CORE_ADDR
-arm_saved_pc_after_call (frame)
- struct frame_info *frame;
+ int framesize;
+ int frameoffset;
+ int framereg;
+};
+
+/* Addresses for calling Thumb functions have the bit 0 set.
+ Here are some macros to test, set, or clear bit 0 of addresses. */
+#define IS_THUMB_ADDR(addr) ((addr) & 1)
+#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
+#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
+
+static int
+arm_frame_chain_valid (CORE_ADDR chain, struct frame_info *thisframe)
{
- return ADDR_BITS_REMOVE (read_register (LR_REGNUM));
+ return (chain != 0 && (FRAME_SAVED_PC (thisframe) >= LOWEST_PC));
}
-/* APCS (ARM procedure call standard) defines the following prologue:
+/* Set to true if the 32-bit mode is in use. */
- mov ip, sp
- [stmfd sp!, {a1,a2,a3,a4}]
- stmfd sp!, {...,fp,ip,lr,pc}
- [stfe f7, [sp, #-12]!]
- [stfe f6, [sp, #-12]!]
- [stfe f5, [sp, #-12]!]
- [stfe f4, [sp, #-12]!]
- sub fp, ip, #nn // nn == 20 or 4 depending on second ins
-*/
+int arm_apcs_32 = 1;
-CORE_ADDR
-arm_skip_prologue (pc)
-CORE_ADDR pc;
-{
- unsigned long inst;
- CORE_ADDR skip_pc = pc;
+/* Flag set by arm_fix_call_dummy that tells whether the target
+ function is a Thumb function. This flag is checked by
+ arm_push_arguments. FIXME: Change the PUSH_ARGUMENTS macro (and
+ its use in valops.c) to pass the function address as an additional
+ parameter. */
- inst = read_memory_integer (skip_pc, 4);
- if (inst != 0xe1a0c00d) /* mov ip, sp */
- return pc;
+static int target_is_thumb;
- skip_pc += 4;
- inst = read_memory_integer (skip_pc, 4);
- if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */
- {
- skip_pc += 4;
- inst = read_memory_integer (skip_pc, 4);
- }
+/* Flag set by arm_fix_call_dummy that tells whether the calling
+ function is a Thumb function. This flag is checked by
+ arm_pc_is_thumb and arm_call_dummy_breakpoint_offset. */
- if ((inst & 0xfffff800) != 0xe92dd800) /* stmfd sp!,{...,fp,ip,lr,pc} */
- return pc;
+static int caller_is_thumb;
- skip_pc += 4;
- inst = read_memory_integer (skip_pc, 4);
+/* Determine if the program counter specified in MEMADDR is in a Thumb
+ function. */
+
+int
+arm_pc_is_thumb (CORE_ADDR memaddr)
+{
+ struct minimal_symbol *sym;
- /* Any insns after this point may float into the code, if it makes
- for better instruction scheduling, so we skip them only if
- we find them, but still consdier the function to be frame-ful */
+ /* If bit 0 of the address is set, assume this is a Thumb address. */
+ if (IS_THUMB_ADDR (memaddr))
+ return 1;
- /* We may have either one sfmfd instruction here, or several stfe insns,
- depending on the version of floating point code we support. */
- if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */
+ /* Thumb functions have a "special" bit set in minimal symbols. */
+ sym = lookup_minimal_symbol_by_pc (memaddr);
+ if (sym)
{
- skip_pc += 4;
- inst = read_memory_integer (skip_pc, 4);
+ return (MSYMBOL_IS_SPECIAL (sym));
}
else
{
- while ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */
- {
- skip_pc += 4;
- inst = read_memory_integer (skip_pc, 4);
- }
+ return 0;
}
+}
- if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */
- skip_pc += 4;
+/* Determine if the program counter specified in MEMADDR is in a call
+ dummy being called from a Thumb function. */
- return skip_pc;
+int
+arm_pc_is_thumb_dummy (CORE_ADDR memaddr)
+{
+ CORE_ADDR sp = read_sp ();
+
+ /* FIXME: Until we switch for the new call dummy macros, this heuristic
+ is the best we can do. We are trying to determine if the pc is on
+ the stack, which (hopefully) will only happen in a call dummy.
+ We hope the current stack pointer is not so far alway from the dummy
+ frame location (true if we have not pushed large data structures or
+ gone too many levels deep) and that our 1024 is not enough to consider
+ code regions as part of the stack (true for most practical purposes). */
+ if (PC_IN_CALL_DUMMY (memaddr, sp, sp + 1024))
+ return caller_is_thumb;
+ else
+ return 0;
}
-void
-arm_frame_find_saved_regs (frame_info, saved_regs_addr)
- struct frame_info *frame_info;
- struct frame_saved_regs *saved_regs_addr;
+/* Remove useless bits from addresses in a running program. */
+static CORE_ADDR
+arm_addr_bits_remove (CORE_ADDR val)
{
- register int regnum;
- register int frame;
- register int next_addr;
- register int return_data_save;
- register int saved_register_mask;
-
- memset (saved_regs_addr, '\0', sizeof (*saved_regs_addr));
- frame = frame_info->frame;
- return_data_save = read_memory_integer (frame, 4) & 0x03fffffc - 12;
- saved_register_mask = read_memory_integer (return_data_save, 4);
- next_addr = frame - 12;
- for (regnum = 4; regnum < 10; regnum++)
- if (saved_register_mask & (1 << regnum))
- {
- next_addr -= 4;
- saved_regs_addr->regs[regnum] = next_addr;
- }
- if (read_memory_integer (return_data_save + 4, 4) == 0xed6d7103)
- {
- next_addr -= 12;
- saved_regs_addr->regs[F0_REGNUM + 7] = next_addr;
- }
- if (read_memory_integer (return_data_save + 8, 4) == 0xed6d6103)
- {
- next_addr -= 12;
- saved_regs_addr->regs[F0_REGNUM + 6] = next_addr;
- }
- if (read_memory_integer (return_data_save + 12, 4) == 0xed6d5103)
- {
- next_addr -= 12;
- saved_regs_addr->regs[F0_REGNUM + 5] = next_addr;
- }
- if (read_memory_integer(return_data_save + 16, 4) == 0xed6d4103)
- {
- next_addr -= 12;
- saved_regs_addr->regs[F0_REGNUM + 4] = next_addr;
- }
- saved_regs_addr->regs[SP_REGNUM] = next_addr;
- saved_regs_addr->regs[PC_REGNUM] = frame - 4;
- saved_regs_addr->regs[PS_REGNUM] = frame - 4;
- saved_regs_addr->regs[FP_REGNUM] = frame - 12;
+ if (arm_apcs_32)
+ return (val & (arm_pc_is_thumb (val) ? 0xfffffffe : 0xfffffffc));
+ else
+ return (val & 0x03fffffc);
}
-void
-arm_push_dummy_frame ()
-{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int regnum;
-
- /* opcode for ldmdb fp,{v1-v6,fp,ip,lr,pc}^ */
- sp = push_word (sp, 0xe92dbf0); /* dummy return_data_save ins */
- /* push a pointer to the dummy instruction minus 12 */
- sp = push_word (sp, read_register (SP_REGNUM) - 16);
- sp = push_word (sp, read_register (PS_REGNUM));
- sp = push_word (sp, read_register (SP_REGNUM));
- sp = push_word (sp, read_register (FP_REGNUM));
- for (regnum = 9; regnum >= 4; regnum --)
- sp = push_word (sp, read_register (regnum));
- write_register (FP_REGNUM, read_register (SP_REGNUM) - 8);
- write_register (SP_REGNUM, sp);
+/* When reading symbols, we need to zap the low bit of the address,
+ which may be set to 1 for Thumb functions. */
+static CORE_ADDR
+arm_smash_text_address (CORE_ADDR val)
+{
+ return val & ~1;
}
-void
-arm_pop_frame ()
-{
- register CORE_ADDR fp = read_register (FP_REGNUM);
- register unsigned long return_data_save =
- read_memory_integer (ADDR_BITS_REMOVE (read_memory_integer (fp, 4)) - 12,
- 4);
- register int regnum;
+/* Immediately after a function call, return the saved pc. Can't
+ always go through the frames for this because on some machines the
+ new frame is not set up until the new function executes some
+ instructions. */
- write_register (PS_REGNUM, read_memory_integer (fp - 4, 4));
- write_register (PC_REGNUM, ADDR_BITS_REMOVE (read_register (PS_REGNUM)));
- write_register (SP_REGNUM, read_memory_integer (fp - 8, 4));
- write_register (FP_REGNUM, read_memory_integer (fp - 12, 4));
- fp -= 12;
- for (regnum = 9; regnum >= 4; regnum--)
- {
- if (return_data_save & (1 << regnum))
- {
- fp -= 4;
- write_register (regnum, read_memory_integer (fp, 4));
- }
- }
- flush_cached_frames ();
+static CORE_ADDR
+arm_saved_pc_after_call (struct frame_info *frame)
+{
+ return ADDR_BITS_REMOVE (read_register (ARM_LR_REGNUM));
}
-static void
-print_fpu_flags (flags)
-int flags;
+/* Determine whether the function invocation represented by FI has a
+ frame on the stack associated with it. If it does return zero,
+ otherwise return 1. */
+
+static int
+arm_frameless_function_invocation (struct frame_info *fi)
{
- if (flags & (1 << 0)) fputs ("IVO ", stdout);
- if (flags & (1 << 1)) fputs ("DVZ ", stdout);
- if (flags & (1 << 2)) fputs ("OFL ", stdout);
- if (flags & (1 << 3)) fputs ("UFL ", stdout);
- if (flags & (1 << 4)) fputs ("INX ", stdout);
- putchar ('\n');
+ CORE_ADDR func_start, after_prologue;
+ int frameless;
+
+ /* Sometimes we have functions that do a little setup (like saving the
+ vN registers with the stmdb instruction, but DO NOT set up a frame.
+ The symbol table will report this as a prologue. However, it is
+ important not to try to parse these partial frames as frames, or we
+ will get really confused.
+
+ So I will demand 3 instructions between the start & end of the
+ prologue before I call it a real prologue, i.e. at least
+ mov ip, sp,
+ stmdb sp!, {}
+ sub sp, ip, #4. */
+
+ func_start = (get_pc_function_start ((fi)->pc) + FUNCTION_START_OFFSET);
+ after_prologue = SKIP_PROLOGUE (func_start);
+
+ /* There are some frameless functions whose first two instructions
+ follow the standard APCS form, in which case after_prologue will
+ be func_start + 8. */
+
+ frameless = (after_prologue < func_start + 12);
+ return frameless;
}
-void
-arm_float_info ()
+/* The address of the arguments in the frame. */
+static CORE_ADDR
+arm_frame_args_address (struct frame_info *fi)
{
- register unsigned long status = read_register (FPS_REGNUM);
- int type;
-
- type = (status >> 24) & 127;
- printf ("%s FPU type %d\n",
- (status & (1<<31)) ? "Hardware" : "Software",
- type);
- fputs ("mask: ", stdout);
- print_fpu_flags (status >> 16);
- fputs ("flags: ", stdout);
- print_fpu_flags (status);
+ return fi->frame;
}
-static void
-arm_othernames ()
+/* The address of the local variables in the frame. */
+static CORE_ADDR
+arm_frame_locals_address (struct frame_info *fi)
{
- static int toggle;
- static char *original[] = ORIGINAL_REGISTER_NAMES;
- static char *extra_crispy[] = ADDITIONAL_REGISTER_NAMES;
-
- memcpy (reg_names, toggle ? extra_crispy : original, sizeof(original));
- toggle = !toggle;
+ return fi->frame;
}
-/* FIXME: Fill in with the 'right thing', see asm
- template in arm-convert.s */
-
-void
-convert_from_extended (ptr, dbl)
-void *ptr;
-double *dbl;
+/* The number of arguments being passed in the frame. */
+static int
+arm_frame_num_args (struct frame_info *fi)
{
- *dbl = *(double*)ptr;
+ /* We have no way of knowing. */
+ return -1;
}
-void
-convert_to_extended (dbl, ptr)
-void *ptr;
-double *dbl;
+/* A typical Thumb prologue looks like this:
+ push {r7, lr}
+ add sp, sp, #-28
+ add r7, sp, #12
+ Sometimes the latter instruction may be replaced by:
+ mov r7, sp
+
+ or like this:
+ push {r7, lr}
+ mov r7, sp
+ sub sp, #12
+
+ or, on tpcs, like this:
+ sub sp,#16
+ push {r7, lr}
+ (many instructions)
+ mov r7, sp
+ sub sp, #12
+
+ There is always one instruction of three classes:
+ 1 - push
+ 2 - setting of r7
+ 3 - adjusting of sp
+
+ When we have found at least one of each class we are done with the prolog.
+ Note that the "sub sp, #NN" before the push does not count.
+ */
+
+static CORE_ADDR
+thumb_skip_prologue (CORE_ADDR pc, CORE_ADDR func_end)
{
- *(double*)ptr = *dbl;
+ CORE_ADDR current_pc;
+ /* findmask:
+ bit 0 - push { rlist }
+ bit 1 - mov r7, sp OR add r7, sp, #imm (setting of r7)
+ bit 2 - sub sp, #simm OR add sp, #simm (adjusting of sp)
+ */
+ int findmask = 0;
+
+ for (current_pc = pc;
+ current_pc + 2 < func_end && current_pc < pc + 40;
+ current_pc += 2)
+ {
+ unsigned short insn = read_memory_unsigned_integer (current_pc, 2);
+
+ if ((insn & 0xfe00) == 0xb400) /* push { rlist } */
+ {
+ findmask |= 1; /* push found */
+ }
+ else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR
+ sub sp, #simm */
+ {
+ if ((findmask & 1) == 0) /* before push ? */
+ continue;
+ else
+ findmask |= 4; /* add/sub sp found */
+ }
+ else if ((insn & 0xff00) == 0xaf00) /* add r7, sp, #imm */
+ {
+ findmask |= 2; /* setting of r7 found */
+ }
+ else if (insn == 0x466f) /* mov r7, sp */
+ {
+ findmask |= 2; /* setting of r7 found */
+ }
+ else if (findmask == (4+2+1))
+ {
+ /* We have found one of each type of prologue instruction */
+ break;
+ }
+ else
+ /* Something in the prolog that we don't care about or some
+ instruction from outside the prolog scheduled here for
+ optimization. */
+ continue;
+ }
+
+ return current_pc;
}
-int
-arm_nullified_insn (inst)
- unsigned long inst;
+/* Advance the PC across any function entry prologue instructions to
+ reach some "real" code.
+
+ The APCS (ARM Procedure Call Standard) defines the following
+ prologue:
+
+ mov ip, sp
+ [stmfd sp!, {a1,a2,a3,a4}]
+ stmfd sp!, {...,fp,ip,lr,pc}
+ [stfe f7, [sp, #-12]!]
+ [stfe f6, [sp, #-12]!]
+ [stfe f5, [sp, #-12]!]
+ [stfe f4, [sp, #-12]!]
+ sub fp, ip, #nn @@ nn == 20 or 4 depending on second insn */
+
+static CORE_ADDR
+arm_skip_prologue (CORE_ADDR pc)
{
- unsigned long cond = inst & 0xf0000000;
- unsigned long status_reg;
+ unsigned long inst;
+ CORE_ADDR skip_pc;
+ CORE_ADDR func_addr, func_end = 0;
+ char *func_name;
+ struct symtab_and_line sal;
+
+ /* If we're in a dummy frame, don't even try to skip the prologue. */
+ if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (pc, 0, 0))
+ return pc;
- if (cond == INST_AL || cond == INST_NV)
- return 0;
+ /* See what the symbol table says. */
- status_reg = read_register (PS_REGNUM);
+ if (find_pc_partial_function (pc, &func_name, &func_addr, &func_end))
+ {
+ struct symbol *sym;
- switch (cond)
+ /* Found a function. */
+ sym = lookup_symbol (func_name, NULL, VAR_NAMESPACE, NULL, NULL);
+ if (sym && SYMBOL_LANGUAGE (sym) != language_asm)
+ {
+ /* Don't use this trick for assembly source files. */
+ sal = find_pc_line (func_addr, 0);
+ if ((sal.line != 0) && (sal.end < func_end))
+ return sal.end;
+ }
+ }
+
+ /* Check if this is Thumb code. */
+ if (arm_pc_is_thumb (pc))
+ return thumb_skip_prologue (pc, func_end);
+
+ /* Can't find the prologue end in the symbol table, try it the hard way
+ by disassembling the instructions. */
+
+ /* Like arm_scan_prologue, stop no later than pc + 64. */
+ if (func_end == 0 || func_end > pc + 64)
+ func_end = pc + 64;
+
+ for (skip_pc = pc; skip_pc < func_end; skip_pc += 4)
{
- case INST_EQ:
- return ((status_reg & FLAG_Z) == 0);
- case INST_NE:
- return ((status_reg & FLAG_Z) != 0);
- case INST_CS:
- return ((status_reg & FLAG_C) == 0);
- case INST_CC:
- return ((status_reg & FLAG_C) != 0);
- case INST_MI:
- return ((status_reg & FLAG_N) == 0);
- case INST_PL:
- return ((status_reg & FLAG_N) != 0);
- case INST_VS:
- return ((status_reg & FLAG_V) == 0);
- case INST_VC:
- return ((status_reg & FLAG_V) != 0);
- case INST_HI:
- return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
- case INST_LS:
- return (((status_reg & (FLAG_C | FLAG_Z)) ^ FLAG_C) == 0);
- case INST_GE:
- return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
- case INST_LT:
- return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
- case INST_GT:
- return (((status_reg & FLAG_Z) != 0) ||
- (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)));
- case INST_LE:
- return (((status_reg & FLAG_Z) == 0) &&
- (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)));
+ inst = read_memory_integer (skip_pc, 4);
+
+ /* "mov ip, sp" is no longer a required part of the prologue. */
+ if (inst == 0xe1a0c00d) /* mov ip, sp */
+ continue;
+
+ /* Some prologues begin with "str lr, [sp, #-4]!". */
+ if (inst == 0xe52de004) /* str lr, [sp, #-4]! */
+ continue;
+
+ if ((inst & 0xfffffff0) == 0xe92d0000) /* stmfd sp!,{a1,a2,a3,a4} */
+ continue;
+
+ if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */
+ continue;
+
+ /* Any insns after this point may float into the code, if it makes
+ for better instruction scheduling, so we skip them only if we
+ find them, but still consider the function to be frame-ful. */
+
+ /* We may have either one sfmfd instruction here, or several stfe
+ insns, depending on the version of floating point code we
+ support. */
+ if ((inst & 0xffbf0fff) == 0xec2d0200) /* sfmfd fn, <cnt>, [sp]! */
+ continue;
+
+ if ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */
+ continue;
+
+ if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */
+ continue;
+
+ if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */
+ continue;
+
+ if ((inst & 0xffffc000) == 0xe54b0000 || /* strb r(0123),[r11,#-nn] */
+ (inst & 0xffffc0f0) == 0xe14b00b0 || /* strh r(0123),[r11,#-nn] */
+ (inst & 0xffffc000) == 0xe50b0000) /* str r(0123),[r11,#-nn] */
+ continue;
+
+ if ((inst & 0xffffc000) == 0xe5cd0000 || /* strb r(0123),[sp,#nn] */
+ (inst & 0xffffc0f0) == 0xe1cd00b0 || /* strh r(0123),[sp,#nn] */
+ (inst & 0xffffc000) == 0xe58d0000) /* str r(0123),[sp,#nn] */
+ continue;
+
+ /* Un-recognized instruction; stop scanning. */
+ break;
}
- return 0;
+
+ return skip_pc; /* End of prologue */
}
-#define submask(x) ((1L << ((x) + 1)) - 1)
-#define bit(obj,st) (((obj) & (1L << (st))) >> st)
-#define bits(obj,st,fn) \
- (((obj) & submask (fn) & ~ submask ((st) - 1)) >> (st))
-#define sbits(obj,st,fn) \
- ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
-#define BranchDest(addr,instr) \
- ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
-#define ARM_PC_32 1
+/* *INDENT-OFF* */
+/* Function: thumb_scan_prologue (helper function for arm_scan_prologue)
+ This function decodes a Thumb function prologue to determine:
+ 1) the size of the stack frame
+ 2) which registers are saved on it
+ 3) the offsets of saved regs
+ 4) the offset from the stack pointer to the frame pointer
+ This information is stored in the "extra" fields of the frame_info.
+
+ A typical Thumb function prologue would create this stack frame
+ (offsets relative to FP)
+ old SP -> 24 stack parameters
+ 20 LR
+ 16 R7
+ R7 -> 0 local variables (16 bytes)
+ SP -> -12 additional stack space (12 bytes)
+ The frame size would thus be 36 bytes, and the frame offset would be
+ 12 bytes. The frame register is R7.
+
+ The comments for thumb_skip_prolog() describe the algorithm we use
+ to detect the end of the prolog. */
+/* *INDENT-ON* */
-static unsigned long
-shifted_reg_val (inst, carry, pc_val)
- unsigned long inst;
- int carry;
- unsigned long pc_val;
+static void
+thumb_scan_prologue (struct frame_info *fi)
{
- unsigned long res, shift;
- int rm = bits (inst, 0, 3);
- unsigned long shifttype = bits (inst, 5, 6);
-
- if (bit(inst, 4))
+ CORE_ADDR prologue_start;
+ CORE_ADDR prologue_end;
+ CORE_ADDR current_pc;
+ /* Which register has been copied to register n? */
+ int saved_reg[16];
+ /* findmask:
+ bit 0 - push { rlist }
+ bit 1 - mov r7, sp OR add r7, sp, #imm (setting of r7)
+ bit 2 - sub sp, #simm OR add sp, #simm (adjusting of sp)
+ */
+ int findmask = 0;
+ int i;
+
+ /* Don't try to scan dummy frames. */
+ if (USE_GENERIC_DUMMY_FRAMES
+ && fi != NULL
+ && PC_IN_CALL_DUMMY (fi->pc, 0, 0))
+ return;
+
+ if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
{
- int rs = bits (inst, 8, 11);
- shift = (rs == 15 ? pc_val + 8 : read_register (rs)) & 0xFF;
+ struct symtab_and_line sal = find_pc_line (prologue_start, 0);
+
+ if (sal.line == 0) /* no line info, use current PC */
+ prologue_end = fi->pc;
+ else if (sal.end < prologue_end) /* next line begins after fn end */
+ prologue_end = sal.end; /* (probably means no prologue) */
}
else
- shift = bits (inst, 7, 11);
-
- res = (rm == 15
- ? ((pc_val | (ARM_PC_32 ? 0 : read_register (PS_REGNUM)))
- + (bit (inst, 4) ? 12 : 8))
- : read_register (rm));
+ /* We're in the boondocks: allow for
+ 16 pushes, an add, and "mv fp,sp". */
+ prologue_end = prologue_start + 40;
- switch (shifttype)
+ prologue_end = min (prologue_end, fi->pc);
+
+ /* Initialize the saved register map. When register H is copied to
+ register L, we will put H in saved_reg[L]. */
+ for (i = 0; i < 16; i++)
+ saved_reg[i] = i;
+
+ /* Search the prologue looking for instructions that set up the
+ frame pointer, adjust the stack pointer, and save registers.
+ Do this until all basic prolog instructions are found. */
+
+ fi->extra_info->framesize = 0;
+ for (current_pc = prologue_start;
+ (current_pc < prologue_end) && ((findmask & 7) != 7);
+ current_pc += 2)
{
- case 0: /* LSL */
- res = shift >= 32 ? 0 : res << shift;
- break;
-
- case 1: /* LSR */
- res = shift >= 32 ? 0 : res >> shift;
- break;
+ unsigned short insn;
+ int regno;
+ int offset;
- case 2: /* ASR */
- if (shift >= 32) shift = 31;
- res = ((res & 0x80000000L)
- ? ~((~res) >> shift) : res >> shift);
- break;
+ insn = read_memory_unsigned_integer (current_pc, 2);
- case 3: /* ROR/RRX */
- shift &= 31;
- if (shift == 0)
- res = (res >> 1) | (carry ? 0x80000000L : 0);
+ if ((insn & 0xfe00) == 0xb400) /* push { rlist } */
+ {
+ int mask;
+ findmask |= 1; /* push found */
+ /* Bits 0-7 contain a mask for registers R0-R7. Bit 8 says
+ whether to save LR (R14). */
+ mask = (insn & 0xff) | ((insn & 0x100) << 6);
+
+ /* Calculate offsets of saved R0-R7 and LR. */
+ for (regno = ARM_LR_REGNUM; regno >= 0; regno--)
+ if (mask & (1 << regno))
+ {
+ fi->extra_info->framesize += 4;
+ fi->saved_regs[saved_reg[regno]] =
+ -(fi->extra_info->framesize);
+ /* Reset saved register map. */
+ saved_reg[regno] = regno;
+ }
+ }
+ else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR
+ sub sp, #simm */
+ {
+ if ((findmask & 1) == 0) /* before push? */
+ continue;
+ else
+ findmask |= 4; /* add/sub sp found */
+
+ offset = (insn & 0x7f) << 2; /* get scaled offset */
+ if (insn & 0x80) /* is it signed? (==subtracting) */
+ {
+ fi->extra_info->frameoffset += offset;
+ offset = -offset;
+ }
+ fi->extra_info->framesize -= offset;
+ }
+ else if ((insn & 0xff00) == 0xaf00) /* add r7, sp, #imm */
+ {
+ findmask |= 2; /* setting of r7 found */
+ fi->extra_info->framereg = THUMB_FP_REGNUM;
+ /* get scaled offset */
+ fi->extra_info->frameoffset = (insn & 0xff) << 2;
+ }
+ else if (insn == 0x466f) /* mov r7, sp */
+ {
+ findmask |= 2; /* setting of r7 found */
+ fi->extra_info->framereg = THUMB_FP_REGNUM;
+ fi->extra_info->frameoffset = 0;
+ saved_reg[THUMB_FP_REGNUM] = ARM_SP_REGNUM;
+ }
+ else if ((insn & 0xffc0) == 0x4640) /* mov r0-r7, r8-r15 */
+ {
+ int lo_reg = insn & 7; /* dest. register (r0-r7) */
+ int hi_reg = ((insn >> 3) & 7) + 8; /* source register (r8-15) */
+ saved_reg[lo_reg] = hi_reg; /* remember hi reg was saved */
+ }
else
- res = (res >> shift) | (res << (32-shift));
- break;
+ /* Something in the prolog that we don't care about or some
+ instruction from outside the prolog scheduled here for
+ optimization. */
+ continue;
}
-
- return res & 0xffffffff;
}
+/* Check if prologue for this frame's PC has already been scanned. If
+ it has, copy the relevant information about that prologue and
+ return non-zero. Otherwise do not copy anything and return zero.
-CORE_ADDR
-arm_get_next_pc (pc)
- CORE_ADDR pc;
+ The information saved in the cache includes:
+ * the frame register number;
+ * the size of the stack frame;
+ * the offsets of saved regs (relative to the old SP); and
+ * the offset from the stack pointer to the frame pointer
+
+ The cache contains only one entry, since this is adequate for the
+ typical sequence of prologue scan requests we get. When performing
+ a backtrace, GDB will usually ask to scan the same function twice
+ in a row (once to get the frame chain, and once to fill in the
+ extra frame information). */
+
+static struct frame_info prologue_cache;
+
+static int
+check_prologue_cache (struct frame_info *fi)
{
- unsigned long pc_val = (unsigned long) pc;
- unsigned long this_instr = read_memory_integer (pc, 4);
- unsigned long status = read_register (PS_REGNUM);
- CORE_ADDR nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */
+ int i;
- if (! arm_nullified_insn (this_instr))
+ if (fi->pc == prologue_cache.pc)
{
- switch (bits(this_instr, 24, 27))
- {
- case 0x0: case 0x1: /* data processing */
- case 0x2: case 0x3:
- {
- unsigned long operand1, operand2, result = 0;
- unsigned long rn;
- int c;
-
- if (bits(this_instr, 12, 15) != 15)
- break;
+ fi->extra_info->framereg = prologue_cache.extra_info->framereg;
+ fi->extra_info->framesize = prologue_cache.extra_info->framesize;
+ fi->extra_info->frameoffset = prologue_cache.extra_info->frameoffset;
+ for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
+ fi->saved_regs[i] = prologue_cache.saved_regs[i];
+ return 1;
+ }
+ else
+ return 0;
+}
- if (bits (this_instr, 22, 25) == 0
- && bits (this_instr, 4, 7) == 9) /* multiply */
- error ("Illegal update to pc in instruction");
- /* Multiply into PC */
- c = (status & FLAG_C) ? 1 : 0;
- rn = bits (this_instr, 16, 19);
- operand1 = (rn == 15) ? pc_val + 8 : read_register (rn);
-
- if (bit (this_instr, 25))
- {
- unsigned long immval = bits (this_instr, 0, 7);
- unsigned long rotate = 2 * bits (this_instr, 8, 11);
- operand2 = ((immval >> rotate) | (immval << (32-rotate))
- & 0xffffffff);
- }
- else /* operand 2 is a shifted register */
- operand2 = shifted_reg_val (this_instr, c, pc_val);
-
- switch (bits (this_instr, 21, 24))
- {
- case 0x0: /*and*/
- result = operand1 & operand2;
- break;
+/* Copy the prologue information from fi to the prologue cache. */
- case 0x1: /*eor*/
- result = operand1 ^ operand2;
- break;
+static void
+save_prologue_cache (struct frame_info *fi)
+{
+ int i;
- case 0x2: /*sub*/
- result = operand1 - operand2;
- break;
+ prologue_cache.pc = fi->pc;
+ prologue_cache.extra_info->framereg = fi->extra_info->framereg;
+ prologue_cache.extra_info->framesize = fi->extra_info->framesize;
+ prologue_cache.extra_info->frameoffset = fi->extra_info->frameoffset;
- case 0x3: /*rsb*/
- result = operand2 - operand1;
- break;
+ for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
+ prologue_cache.saved_regs[i] = fi->saved_regs[i];
+}
- case 0x4: /*add*/
- result = operand1 + operand2;
- break;
- case 0x5: /*adc*/
- result = operand1 + operand2 + c;
- break;
+/* This function decodes an ARM function prologue to determine:
+ 1) the size of the stack frame
+ 2) which registers are saved on it
+ 3) the offsets of saved regs
+ 4) the offset from the stack pointer to the frame pointer
+ This information is stored in the "extra" fields of the frame_info.
+
+ There are two basic forms for the ARM prologue. The fixed argument
+ function call will look like:
+
+ mov ip, sp
+ stmfd sp!, {fp, ip, lr, pc}
+ sub fp, ip, #4
+ [sub sp, sp, #4]
+
+ Which would create this stack frame (offsets relative to FP):
+ IP -> 4 (caller's stack)
+ FP -> 0 PC (points to address of stmfd instruction + 8 in callee)
+ -4 LR (return address in caller)
+ -8 IP (copy of caller's SP)
+ -12 FP (caller's FP)
+ SP -> -28 Local variables
+
+ The frame size would thus be 32 bytes, and the frame offset would be
+ 28 bytes. The stmfd call can also save any of the vN registers it
+ plans to use, which increases the frame size accordingly.
+
+ Note: The stored PC is 8 off of the STMFD instruction that stored it
+ because the ARM Store instructions always store PC + 8 when you read
+ the PC register.
+
+ A variable argument function call will look like:
+
+ mov ip, sp
+ stmfd sp!, {a1, a2, a3, a4}
+ stmfd sp!, {fp, ip, lr, pc}
+ sub fp, ip, #20
+
+ Which would create this stack frame (offsets relative to FP):
+ IP -> 20 (caller's stack)
+ 16 A4
+ 12 A3
+ 8 A2
+ 4 A1
+ FP -> 0 PC (points to address of stmfd instruction + 8 in callee)
+ -4 LR (return address in caller)
+ -8 IP (copy of caller's SP)
+ -12 FP (caller's FP)
+ SP -> -28 Local variables
+
+ The frame size would thus be 48 bytes, and the frame offset would be
+ 28 bytes.
+
+ There is another potential complication, which is that the optimizer
+ will try to separate the store of fp in the "stmfd" instruction from
+ the "sub fp, ip, #NN" instruction. Almost anything can be there, so
+ we just key on the stmfd, and then scan for the "sub fp, ip, #NN"...
+
+ Also, note, the original version of the ARM toolchain claimed that there
+ should be an
+
+ instruction at the end of the prologue. I have never seen GCC produce
+ this, and the ARM docs don't mention it. We still test for it below in
+ case it happens...
+
+ */
- case 0x6: /*sbc*/
- result = operand1 - operand2 + c;
- break;
+static void
+arm_scan_prologue (struct frame_info *fi)
+{
+ int regno, sp_offset, fp_offset;
+ LONGEST return_value;
+ CORE_ADDR prologue_start, prologue_end, current_pc;
- case 0x7: /*rsc*/
- result = operand2 - operand1 + c;
- break;
+ /* Check if this function is already in the cache of frame information. */
+ if (check_prologue_cache (fi))
+ return;
- case 0x8: case 0x9: case 0xa: case 0xb: /* tst, teq, cmp, cmn */
- result = (unsigned long) nextpc;
- break;
+ /* Assume there is no frame until proven otherwise. */
+ fi->extra_info->framereg = ARM_SP_REGNUM;
+ fi->extra_info->framesize = 0;
+ fi->extra_info->frameoffset = 0;
- case 0xc: /*orr*/
- result = operand1 | operand2;
- break;
+ /* Check for Thumb prologue. */
+ if (arm_pc_is_thumb (fi->pc))
+ {
+ thumb_scan_prologue (fi);
+ save_prologue_cache (fi);
+ return;
+ }
- case 0xd: /*mov*/
- /* Always step into a function. */
- result = operand2;
- break;
+ /* Find the function prologue. If we can't find the function in
+ the symbol table, peek in the stack frame to find the PC. */
+ if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
+ {
+ /* One way to find the end of the prologue (which works well
+ for unoptimized code) is to do the following:
+
+ struct symtab_and_line sal = find_pc_line (prologue_start, 0);
+
+ if (sal.line == 0)
+ prologue_end = fi->pc;
+ else if (sal.end < prologue_end)
+ prologue_end = sal.end;
+
+ This mechanism is very accurate so long as the optimizer
+ doesn't move any instructions from the function body into the
+ prologue. If this happens, sal.end will be the last
+ instruction in the first hunk of prologue code just before
+ the first instruction that the scheduler has moved from
+ the body to the prologue.
+
+ In order to make sure that we scan all of the prologue
+ instructions, we use a slightly less accurate mechanism which
+ may scan more than necessary. To help compensate for this
+ lack of accuracy, the prologue scanning loop below contains
+ several clauses which'll cause the loop to terminate early if
+ an implausible prologue instruction is encountered.
+
+ The expression
+
+ prologue_start + 64
+
+ is a suitable endpoint since it accounts for the largest
+ possible prologue plus up to five instructions inserted by
+ the scheduler. */
+
+ if (prologue_end > prologue_start + 64)
+ {
+ prologue_end = prologue_start + 64; /* See above. */
+ }
+ }
+ else
+ {
+ /* Get address of the stmfd in the prologue of the callee;
+ the saved PC is the address of the stmfd + 8. */
+ if (!safe_read_memory_integer (fi->frame, 4, &return_value))
+ return;
+ else
+ {
+ prologue_start = ADDR_BITS_REMOVE (return_value) - 8;
+ prologue_end = prologue_start + 64; /* See above. */
+ }
+ }
- case 0xe: /*bic*/
- result = operand1 & ~operand2;
- break;
+ /* Now search the prologue looking for instructions that set up the
+ frame pointer, adjust the stack pointer, and save registers.
- case 0xf: /*mvn*/
- result = ~operand2;
- break;
- }
- nextpc = (CORE_ADDR) ADDR_BITS_REMOVE (result);
+ Be careful, however, and if it doesn't look like a prologue,
+ don't try to scan it. If, for instance, a frameless function
+ begins with stmfd sp!, then we will tell ourselves there is
+ a frame, which will confuse stack traceback, as well as "finish"
+ and other operations that rely on a knowledge of the stack
+ traceback.
- if (nextpc == pc)
+ In the APCS, the prologue should start with "mov ip, sp" so
+ if we don't see this as the first insn, we will stop.
+
+ [Note: This doesn't seem to be true any longer, so it's now an
+ optional part of the prologue. - Kevin Buettner, 2001-11-20]
+
+ [Note further: The "mov ip,sp" only seems to be missing in
+ frameless functions at optimization level "-O2" or above,
+ in which case it is often (but not always) replaced by
+ "str lr, [sp, #-4]!". - Michael Snyder, 2002-04-23] */
+
+ sp_offset = fp_offset = 0;
+
+ for (current_pc = prologue_start;
+ current_pc < prologue_end;
+ current_pc += 4)
+ {
+ unsigned int insn = read_memory_unsigned_integer (current_pc, 4);
+
+ if (insn == 0xe1a0c00d) /* mov ip, sp */
+ {
+ continue;
+ }
+ else if (insn == 0xe52de004) /* str lr, [sp, #-4]! */
+ {
+ /* Function is frameless: extra_info defaults OK? */
+ continue;
+ }
+ else if ((insn & 0xffff0000) == 0xe92d0000)
+ /* stmfd sp!, {..., fp, ip, lr, pc}
+ or
+ stmfd sp!, {a1, a2, a3, a4} */
+ {
+ int mask = insn & 0xffff;
+
+ /* Calculate offsets of saved registers. */
+ for (regno = ARM_PC_REGNUM; regno >= 0; regno--)
+ if (mask & (1 << regno))
+ {
+ sp_offset -= 4;
+ fi->saved_regs[regno] = sp_offset;
+ }
+ }
+ else if ((insn & 0xffffc000) == 0xe54b0000 || /* strb rx,[r11,#-n] */
+ (insn & 0xffffc0f0) == 0xe14b00b0 || /* strh rx,[r11,#-n] */
+ (insn & 0xffffc000) == 0xe50b0000) /* str rx,[r11,#-n] */
+ {
+ /* No need to add this to saved_regs -- it's just an arg reg. */
+ continue;
+ }
+ else if ((insn & 0xffffc000) == 0xe5cd0000 || /* strb rx,[sp,#n] */
+ (insn & 0xffffc0f0) == 0xe1cd00b0 || /* strh rx,[sp,#n] */
+ (insn & 0xffffc000) == 0xe58d0000) /* str rx,[sp,#n] */
+ {
+ /* No need to add this to saved_regs -- it's just an arg reg. */
+ continue;
+ }
+ else if ((insn & 0xfffff000) == 0xe24cb000) /* sub fp, ip #n */
+ {
+ unsigned imm = insn & 0xff; /* immediate value */
+ unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
+ imm = (imm >> rot) | (imm << (32 - rot));
+ fp_offset = -imm;
+ fi->extra_info->framereg = ARM_FP_REGNUM;
+ }
+ else if ((insn & 0xfffff000) == 0xe24dd000) /* sub sp, sp #n */
+ {
+ unsigned imm = insn & 0xff; /* immediate value */
+ unsigned rot = (insn & 0xf00) >> 7; /* rotate amount */
+ imm = (imm >> rot) | (imm << (32 - rot));
+ sp_offset -= imm;
+ }
+ else if ((insn & 0xffff7fff) == 0xed6d0103) /* stfe f?, [sp, -#c]! */
+ {
+ sp_offset -= 12;
+ regno = ARM_F0_REGNUM + ((insn >> 12) & 0x07);
+ fi->saved_regs[regno] = sp_offset;
+ }
+ else if ((insn & 0xffbf0fff) == 0xec2d0200) /* sfmfd f0, 4, [sp!] */
+ {
+ int n_saved_fp_regs;
+ unsigned int fp_start_reg, fp_bound_reg;
+
+ if ((insn & 0x800) == 0x800) /* N0 is set */
+ {
+ if ((insn & 0x40000) == 0x40000) /* N1 is set */
+ n_saved_fp_regs = 3;
+ else
+ n_saved_fp_regs = 1;
+ }
+ else
+ {
+ if ((insn & 0x40000) == 0x40000) /* N1 is set */
+ n_saved_fp_regs = 2;
+ else
+ n_saved_fp_regs = 4;
+ }
+
+ fp_start_reg = ARM_F0_REGNUM + ((insn >> 12) & 0x7);
+ fp_bound_reg = fp_start_reg + n_saved_fp_regs;
+ for (; fp_start_reg < fp_bound_reg; fp_start_reg++)
+ {
+ sp_offset -= 12;
+ fi->saved_regs[fp_start_reg++] = sp_offset;
+ }
+ }
+ else if ((insn & 0xf0000000) != 0xe0000000)
+ break; /* Condition not true, exit early */
+ else if ((insn & 0xfe200000) == 0xe8200000) /* ldm? */
+ break; /* Don't scan past a block load */
+ else
+ /* The optimizer might shove anything into the prologue,
+ so we just skip what we don't recognize. */
+ continue;
+ }
+
+ /* The frame size is just the negative of the offset (from the
+ original SP) of the last thing thing we pushed on the stack.
+ The frame offset is [new FP] - [new SP]. */
+ fi->extra_info->framesize = -sp_offset;
+ if (fi->extra_info->framereg == ARM_FP_REGNUM)
+ fi->extra_info->frameoffset = fp_offset - sp_offset;
+ else
+ fi->extra_info->frameoffset = 0;
+
+ save_prologue_cache (fi);
+}
+
+/* Find REGNUM on the stack. Otherwise, it's in an active register.
+ One thing we might want to do here is to check REGNUM against the
+ clobber mask, and somehow flag it as invalid if it isn't saved on
+ the stack somewhere. This would provide a graceful failure mode
+ when trying to get the value of caller-saves registers for an inner
+ frame. */
+
+static CORE_ADDR
+arm_find_callers_reg (struct frame_info *fi, int regnum)
+{
+ /* NOTE: cagney/2002-05-03: This function really shouldn't be
+ needed. Instead the (still being written) register unwind
+ function could be called directly. */
+ for (; fi; fi = fi->next)
+ {
+ if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->pc, 0, 0))
+ {
+ return deprecated_read_register_dummy (fi->pc, fi->frame, regnum);
+ }
+ else if (fi->saved_regs[regnum] != 0)
+ {
+ /* NOTE: cagney/2002-05-03: This would normally need to
+ handle ARM_SP_REGNUM as a special case as, according to
+ the frame.h comments, saved_regs[SP_REGNUM] contains the
+ SP value not its address. It appears that the ARM isn't
+ doing this though. */
+ return read_memory_integer (fi->saved_regs[regnum],
+ REGISTER_RAW_SIZE (regnum));
+ }
+ }
+ return read_register (regnum);
+}
+/* Function: frame_chain Given a GDB frame, determine the address of
+ the calling function's frame. This will be used to create a new
+ GDB frame struct, and then INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC
+ will be called for the new frame. For ARM, we save the frame size
+ when we initialize the frame_info. */
+
+static CORE_ADDR
+arm_frame_chain (struct frame_info *fi)
+{
+ CORE_ADDR caller_pc;
+ int framereg = fi->extra_info->framereg;
+
+ if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->pc, 0, 0))
+ /* A generic call dummy's frame is the same as caller's. */
+ return fi->frame;
+
+ if (fi->pc < LOWEST_PC)
+ return 0;
+
+ /* If the caller is the startup code, we're at the end of the chain. */
+ caller_pc = FRAME_SAVED_PC (fi);
+
+ /* If the caller is Thumb and the caller is ARM, or vice versa,
+ the frame register of the caller is different from ours.
+ So we must scan the prologue of the caller to determine its
+ frame register number. */
+ /* XXX Fixme, we should try to do this without creating a temporary
+ caller_fi. */
+ if (arm_pc_is_thumb (caller_pc) != arm_pc_is_thumb (fi->pc))
+ {
+ struct frame_info caller_fi;
+ struct cleanup *old_chain;
+
+ /* Create a temporary frame suitable for scanning the caller's
+ prologue. (Ugh.) */
+ memset (&caller_fi, 0, sizeof (caller_fi));
+ caller_fi.extra_info = (struct frame_extra_info *)
+ xcalloc (1, sizeof (struct frame_extra_info));
+ old_chain = make_cleanup (xfree, caller_fi.extra_info);
+ caller_fi.saved_regs = (CORE_ADDR *)
+ xcalloc (1, SIZEOF_FRAME_SAVED_REGS);
+ make_cleanup (xfree, caller_fi.saved_regs);
+
+ /* Now, scan the prologue and obtain the frame register. */
+ caller_fi.pc = caller_pc;
+ arm_scan_prologue (&caller_fi);
+ framereg = caller_fi.extra_info->framereg;
+
+ /* Deallocate the storage associated with the temporary frame
+ created above. */
+ do_cleanups (old_chain);
+ }
+
+ /* If the caller used a frame register, return its value.
+ Otherwise, return the caller's stack pointer. */
+ if (framereg == ARM_FP_REGNUM || framereg == THUMB_FP_REGNUM)
+ return arm_find_callers_reg (fi, framereg);
+ else
+ return fi->frame + fi->extra_info->framesize;
+}
+
+/* This function actually figures out the frame address for a given pc
+ and sp. This is tricky because we sometimes don't use an explicit
+ frame pointer, and the previous stack pointer isn't necessarily
+ recorded on the stack. The only reliable way to get this info is
+ to examine the prologue. FROMLEAF is a little confusing, it means
+ this is the next frame up the chain AFTER a frameless function. If
+ this is true, then the frame value for this frame is still in the
+ fp register. */
+
+static void
+arm_init_extra_frame_info (int fromleaf, struct frame_info *fi)
+{
+ int reg;
+ CORE_ADDR sp;
+
+ if (fi->saved_regs == NULL)
+ frame_saved_regs_zalloc (fi);
+
+ fi->extra_info = (struct frame_extra_info *)
+ frame_obstack_alloc (sizeof (struct frame_extra_info));
+
+ fi->extra_info->framesize = 0;
+ fi->extra_info->frameoffset = 0;
+ fi->extra_info->framereg = 0;
+
+ if (fi->next)
+ fi->pc = FRAME_SAVED_PC (fi->next);
+
+ memset (fi->saved_regs, '\000', sizeof fi->saved_regs);
+
+ /* Compute stack pointer for this frame. We use this value for both
+ the sigtramp and call dummy cases. */
+ if (!fi->next)
+ sp = read_sp();
+ else if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->next->pc, 0, 0))
+ /* For generic dummy frames, pull the value direct from the frame.
+ Having an unwind function to do this would be nice. */
+ sp = deprecated_read_register_dummy (fi->next->pc, fi->next->frame,
+ ARM_SP_REGNUM);
+ else
+ sp = (fi->next->frame - fi->next->extra_info->frameoffset
+ + fi->next->extra_info->framesize);
+
+ /* Determine whether or not we're in a sigtramp frame.
+ Unfortunately, it isn't sufficient to test
+ fi->signal_handler_caller because this value is sometimes set
+ after invoking INIT_EXTRA_FRAME_INFO. So we test *both*
+ fi->signal_handler_caller and PC_IN_SIGTRAMP to determine if we
+ need to use the sigcontext addresses for the saved registers.
+
+ Note: If an ARM PC_IN_SIGTRAMP method ever needs to compare
+ against the name of the function, the code below will have to be
+ changed to first fetch the name of the function and then pass
+ this name to PC_IN_SIGTRAMP. */
+
+ if (SIGCONTEXT_REGISTER_ADDRESS_P ()
+ && (fi->signal_handler_caller || PC_IN_SIGTRAMP (fi->pc, (char *)0)))
+ {
+ for (reg = 0; reg < NUM_REGS; reg++)
+ fi->saved_regs[reg] = SIGCONTEXT_REGISTER_ADDRESS (sp, fi->pc, reg);
+
+ /* FIXME: What about thumb mode? */
+ fi->extra_info->framereg = ARM_SP_REGNUM;
+ fi->frame =
+ read_memory_integer (fi->saved_regs[fi->extra_info->framereg],
+ REGISTER_RAW_SIZE (fi->extra_info->framereg));
+ fi->extra_info->framesize = 0;
+ fi->extra_info->frameoffset = 0;
+
+ }
+ else if (!USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->pc, sp, fi->frame))
+ {
+ CORE_ADDR rp;
+ CORE_ADDR callers_sp;
+
+ /* Set rp point at the high end of the saved registers. */
+ rp = fi->frame - REGISTER_SIZE;
+
+ /* Fill in addresses of saved registers. */
+ fi->saved_regs[ARM_PS_REGNUM] = rp;
+ rp -= REGISTER_RAW_SIZE (ARM_PS_REGNUM);
+ for (reg = ARM_PC_REGNUM; reg >= 0; reg--)
+ {
+ fi->saved_regs[reg] = rp;
+ rp -= REGISTER_RAW_SIZE (reg);
+ }
+
+ callers_sp = read_memory_integer (fi->saved_regs[ARM_SP_REGNUM],
+ REGISTER_RAW_SIZE (ARM_SP_REGNUM));
+ if (arm_pc_is_thumb (fi->pc))
+ fi->extra_info->framereg = THUMB_FP_REGNUM;
+ else
+ fi->extra_info->framereg = ARM_FP_REGNUM;
+ fi->extra_info->framesize = callers_sp - sp;
+ fi->extra_info->frameoffset = fi->frame - sp;
+ }
+ else
+ {
+ arm_scan_prologue (fi);
+
+ if (!fi->next)
+ /* This is the innermost frame? */
+ fi->frame = read_register (fi->extra_info->framereg);
+ else if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->next->pc, 0, 0))
+ /* Next inner most frame is a dummy, just grab its frame.
+ Dummy frames always have the same FP as their caller. */
+ fi->frame = fi->next->frame;
+ else if (fi->extra_info->framereg == ARM_FP_REGNUM
+ || fi->extra_info->framereg == THUMB_FP_REGNUM)
+ {
+ /* not the innermost frame */
+ /* If we have an FP, the callee saved it. */
+ if (fi->next->saved_regs[fi->extra_info->framereg] != 0)
+ fi->frame =
+ read_memory_integer (fi->next
+ ->saved_regs[fi->extra_info->framereg], 4);
+ else if (fromleaf)
+ /* If we were called by a frameless fn. then our frame is
+ still in the frame pointer register on the board... */
+ fi->frame = read_fp ();
+ }
+
+ /* Calculate actual addresses of saved registers using offsets
+ determined by arm_scan_prologue. */
+ for (reg = 0; reg < NUM_REGS; reg++)
+ if (fi->saved_regs[reg] != 0)
+ fi->saved_regs[reg] += (fi->frame + fi->extra_info->framesize
+ - fi->extra_info->frameoffset);
+ }
+}
+
+
+/* Find the caller of this frame. We do this by seeing if ARM_LR_REGNUM
+ is saved in the stack anywhere, otherwise we get it from the
+ registers.
+
+ The old definition of this function was a macro:
+ #define FRAME_SAVED_PC(FRAME) \
+ ADDR_BITS_REMOVE (read_memory_integer ((FRAME)->frame - 4, 4)) */
+
+static CORE_ADDR
+arm_frame_saved_pc (struct frame_info *fi)
+{
+ /* If a dummy frame, pull the PC out of the frame's register buffer. */
+ if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (fi->pc, 0, 0))
+ return deprecated_read_register_dummy (fi->pc, fi->frame, ARM_PC_REGNUM);
+
+ if (PC_IN_CALL_DUMMY (fi->pc, fi->frame - fi->extra_info->frameoffset,
+ fi->frame))
+ {
+ return read_memory_integer (fi->saved_regs[ARM_PC_REGNUM],
+ REGISTER_RAW_SIZE (ARM_PC_REGNUM));
+ }
+ else
+ {
+ CORE_ADDR pc = arm_find_callers_reg (fi, ARM_LR_REGNUM);
+ return IS_THUMB_ADDR (pc) ? UNMAKE_THUMB_ADDR (pc) : pc;
+ }
+}
+
+/* Return the frame address. On ARM, it is R11; on Thumb it is R7.
+ Examine the Program Status Register to decide which state we're in. */
+
+static CORE_ADDR
+arm_read_fp (void)
+{
+ if (read_register (ARM_PS_REGNUM) & 0x20) /* Bit 5 is Thumb state bit */
+ return read_register (THUMB_FP_REGNUM); /* R7 if Thumb */
+ else
+ return read_register (ARM_FP_REGNUM); /* R11 if ARM */
+}
+
+/* Store into a struct frame_saved_regs the addresses of the saved
+ registers of frame described by FRAME_INFO. This includes special
+ registers such as PC and FP saved in special ways in the stack
+ frame. SP is even more special: the address we return for it IS
+ the sp for the next frame. */
+
+static void
+arm_frame_init_saved_regs (struct frame_info *fip)
+{
+
+ if (fip->saved_regs)
+ return;
+
+ arm_init_extra_frame_info (0, fip);
+}
+
+/* Set the return address for a generic dummy frame. ARM uses the
+ entry point. */
+
+static CORE_ADDR
+arm_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+ write_register (ARM_LR_REGNUM, CALL_DUMMY_ADDRESS ());
+ return sp;
+}
+
+/* Push an empty stack frame, to record the current PC, etc. */
+
+static void
+arm_push_dummy_frame (void)
+{
+ CORE_ADDR old_sp = read_register (ARM_SP_REGNUM);
+ CORE_ADDR sp = old_sp;
+ CORE_ADDR fp, prologue_start;
+ int regnum;
+
+ /* Push the two dummy prologue instructions in reverse order,
+ so that they'll be in the correct low-to-high order in memory. */
+ /* sub fp, ip, #4 */
+ sp = push_word (sp, 0xe24cb004);
+ /* stmdb sp!, {r0-r10, fp, ip, lr, pc} */
+ prologue_start = sp = push_word (sp, 0xe92ddfff);
+
+ /* Push a pointer to the dummy prologue + 12, because when stm
+ instruction stores the PC, it stores the address of the stm
+ instruction itself plus 12. */
+ fp = sp = push_word (sp, prologue_start + 12);
+
+ /* Push the processor status. */
+ sp = push_word (sp, read_register (ARM_PS_REGNUM));
+
+ /* Push all 16 registers starting with r15. */
+ for (regnum = ARM_PC_REGNUM; regnum >= 0; regnum--)
+ sp = push_word (sp, read_register (regnum));
+
+ /* Update fp (for both Thumb and ARM) and sp. */
+ write_register (ARM_FP_REGNUM, fp);
+ write_register (THUMB_FP_REGNUM, fp);
+ write_register (ARM_SP_REGNUM, sp);
+}
+
+/* CALL_DUMMY_WORDS:
+ This sequence of words is the instructions
+
+ mov lr,pc
+ mov pc,r4
+ illegal
+
+ Note this is 12 bytes. */
+
+static LONGEST arm_call_dummy_words[] =
+{
+ 0xe1a0e00f, 0xe1a0f004, 0xe7ffdefe
+};
+
+/* Adjust the call_dummy_breakpoint_offset for the bp_call_dummy
+ breakpoint to the proper address in the call dummy, so that
+ `finish' after a stop in a call dummy works.
+
+ FIXME rearnsha 2002-02018: Tweeking current_gdbarch is not an
+ optimal solution, but the call to arm_fix_call_dummy is immediately
+ followed by a call to run_stack_dummy, which is the only function
+ where call_dummy_breakpoint_offset is actually used. */
+
+
+static void
+arm_set_call_dummy_breakpoint_offset (void)
+{
+ if (caller_is_thumb)
+ set_gdbarch_call_dummy_breakpoint_offset (current_gdbarch, 4);
+ else
+ set_gdbarch_call_dummy_breakpoint_offset (current_gdbarch, 8);
+}
+
+/* Fix up the call dummy, based on whether the processor is currently
+ in Thumb or ARM mode, and whether the target function is Thumb or
+ ARM. There are three different situations requiring three
+ different dummies:
+
+ * ARM calling ARM: uses the call dummy in tm-arm.h, which has already
+ been copied into the dummy parameter to this function.
+ * ARM calling Thumb: uses the call dummy in tm-arm.h, but with the
+ "mov pc,r4" instruction patched to be a "bx r4" instead.
+ * Thumb calling anything: uses the Thumb dummy defined below, which
+ works for calling both ARM and Thumb functions.
+
+ All three call dummies expect to receive the target function
+ address in R4, with the low bit set if it's a Thumb function. */
+
+static void
+arm_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
+ struct value **args, struct type *type, int gcc_p)
+{
+ static short thumb_dummy[4] =
+ {
+ 0xf000, 0xf801, /* bl label */
+ 0xdf18, /* swi 24 */
+ 0x4720, /* label: bx r4 */
+ };
+ static unsigned long arm_bx_r4 = 0xe12fff14; /* bx r4 instruction */
+
+ /* Set flag indicating whether the current PC is in a Thumb function. */
+ caller_is_thumb = arm_pc_is_thumb (read_pc ());
+ arm_set_call_dummy_breakpoint_offset ();
+
+ /* If the target function is Thumb, set the low bit of the function
+ address. And if the CPU is currently in ARM mode, patch the
+ second instruction of call dummy to use a BX instruction to
+ switch to Thumb mode. */
+ target_is_thumb = arm_pc_is_thumb (fun);
+ if (target_is_thumb)
+ {
+ fun |= 1;
+ if (!caller_is_thumb)
+ store_unsigned_integer (dummy + 4, sizeof (arm_bx_r4), arm_bx_r4);
+ }
+
+ /* If the CPU is currently in Thumb mode, use the Thumb call dummy
+ instead of the ARM one that's already been copied. This will
+ work for both Thumb and ARM target functions. */
+ if (caller_is_thumb)
+ {
+ int i;
+ char *p = dummy;
+ int len = sizeof (thumb_dummy) / sizeof (thumb_dummy[0]);
+
+ for (i = 0; i < len; i++)
+ {
+ store_unsigned_integer (p, sizeof (thumb_dummy[0]), thumb_dummy[i]);
+ p += sizeof (thumb_dummy[0]);
+ }
+ }
+
+ /* Put the target address in r4; the call dummy will copy this to
+ the PC. */
+ write_register (4, fun);
+}
+
+/* Note: ScottB
+
+ This function does not support passing parameters using the FPA
+ variant of the APCS. It passes any floating point arguments in the
+ general registers and/or on the stack. */
+
+static CORE_ADDR
+arm_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+ int struct_return, CORE_ADDR struct_addr)
+{
+ CORE_ADDR fp;
+ int argnum;
+ int argreg;
+ int nstack;
+ int simd_argreg;
+ int second_pass;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ /* Walk through the list of args and determine how large a temporary
+ stack is required. Need to take care here as structs may be
+ passed on the stack, and we have to to push them. On the second
+ pass, do the store. */
+ nstack = 0;
+ fp = sp;
+ for (second_pass = 0; second_pass < 2; second_pass++)
+ {
+ /* Compute the FP using the information computed during the
+ first pass. */
+ if (second_pass)
+ fp = sp - nstack;
+
+ simd_argreg = 0;
+ argreg = ARM_A1_REGNUM;
+ nstack = 0;
+
+ /* The struct_return pointer occupies the first parameter
+ passing register. */
+ if (struct_return)
+ {
+ if (second_pass)
+ {
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "struct return in %s = 0x%s\n",
+ REGISTER_NAME (argreg),
+ paddr (struct_addr));
+ write_register (argreg, struct_addr);
+ }
+ argreg++;
+ }
+
+ for (argnum = 0; argnum < nargs; argnum++)
+ {
+ int len;
+ struct type *arg_type;
+ struct type *target_type;
+ enum type_code typecode;
+ char *val;
+
+ arg_type = check_typedef (VALUE_TYPE (args[argnum]));
+ len = TYPE_LENGTH (arg_type);
+ target_type = TYPE_TARGET_TYPE (arg_type);
+ typecode = TYPE_CODE (arg_type);
+ val = VALUE_CONTENTS (args[argnum]);
+
+ /* If the argument is a pointer to a function, and it is a
+ Thumb function, create a LOCAL copy of the value and set
+ the THUMB bit in it. */
+ if (second_pass
+ && TYPE_CODE_PTR == typecode
+ && target_type != NULL
+ && TYPE_CODE_FUNC == TYPE_CODE (target_type))
+ {
+ CORE_ADDR regval = extract_address (val, len);
+ if (arm_pc_is_thumb (regval))
+ {
+ val = alloca (len);
+ store_address (val, len, MAKE_THUMB_ADDR (regval));
+ }
+ }
+
+ /* Copy the argument to general registers or the stack in
+ register-sized pieces. Large arguments are split between
+ registers and stack. */
+ while (len > 0)
+ {
+ int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
+
+ if (argreg <= ARM_LAST_ARG_REGNUM)
+ {
+ /* The argument is being passed in a general purpose
+ register. */
+ if (second_pass)
+ {
+ CORE_ADDR regval = extract_address (val,
+ partial_len);
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "arg %d in %s = 0x%s\n",
+ argnum,
+ REGISTER_NAME (argreg),
+ phex (regval, REGISTER_SIZE));
+ write_register (argreg, regval);
+ }
+ argreg++;
+ }
+ else
+ {
+ if (second_pass)
+ {
+ /* Push the arguments onto the stack. */
+ if (arm_debug)
+ fprintf_unfiltered (gdb_stdlog,
+ "arg %d @ 0x%s + %d\n",
+ argnum, paddr (fp), nstack);
+ write_memory (fp + nstack, val, REGISTER_SIZE);
+ }
+ nstack += REGISTER_SIZE;
+ }
+
+ len -= partial_len;
+ val += partial_len;
+ }
+
+ }
+ }
+
+ /* Return the botom of the argument list (pointed to by fp). */
+ return fp;
+}
+
+/* Pop the current frame. So long as the frame info has been
+ initialized properly (see arm_init_extra_frame_info), this code
+ works for dummy frames as well as regular frames. I.e, there's no
+ need to have a special case for dummy frames. */
+static void
+arm_pop_frame (void)
+{
+ int regnum;
+ struct frame_info *frame = get_current_frame ();
+ CORE_ADDR old_SP = (frame->frame - frame->extra_info->frameoffset
+ + frame->extra_info->framesize);
+
+ if (USE_GENERIC_DUMMY_FRAMES
+ && PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ {
+ generic_pop_dummy_frame ();
+ flush_cached_frames ();
+ return;
+ }
+
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ if (frame->saved_regs[regnum] != 0)
+ write_register (regnum,
+ read_memory_integer (frame->saved_regs[regnum],
+ REGISTER_RAW_SIZE (regnum)));
+
+ write_register (ARM_PC_REGNUM, FRAME_SAVED_PC (frame));
+ write_register (ARM_SP_REGNUM, old_SP);
+
+ flush_cached_frames ();
+}
+
+static void
+print_fpu_flags (int flags)
+{
+ if (flags & (1 << 0))
+ fputs ("IVO ", stdout);
+ if (flags & (1 << 1))
+ fputs ("DVZ ", stdout);
+ if (flags & (1 << 2))
+ fputs ("OFL ", stdout);
+ if (flags & (1 << 3))
+ fputs ("UFL ", stdout);
+ if (flags & (1 << 4))
+ fputs ("INX ", stdout);
+ putchar ('\n');
+}
+
+/* Print interesting information about the floating point processor
+ (if present) or emulator. */
+static void
+arm_print_float_info (struct gdbarch *gdbarch, struct ui_file *file,
+ struct frame_info *frame, const char *args)
+{
+ register unsigned long status = read_register (ARM_FPS_REGNUM);
+ int type;
+
+ type = (status >> 24) & 127;
+ printf ("%s FPU type %d\n",
+ (status & (1 << 31)) ? "Hardware" : "Software",
+ type);
+ fputs ("mask: ", stdout);
+ print_fpu_flags (status >> 16);
+ fputs ("flags: ", stdout);
+ print_fpu_flags (status);
+}
+
+/* Return the GDB type object for the "standard" data type of data in
+ register N. */
+
+static struct type *
+arm_register_type (int regnum)
+{
+ if (regnum >= ARM_F0_REGNUM && regnum < ARM_F0_REGNUM + NUM_FREGS)
+ {
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ return builtin_type_arm_ext_big;
+ else
+ return builtin_type_arm_ext_littlebyte_bigword;
+ }
+ else
+ return builtin_type_int32;
+}
+
+/* Index within `registers' of the first byte of the space for
+ register N. */
+
+static int
+arm_register_byte (int regnum)
+{
+ if (regnum < ARM_F0_REGNUM)
+ return regnum * INT_REGISTER_RAW_SIZE;
+ else if (regnum < ARM_PS_REGNUM)
+ return (NUM_GREGS * INT_REGISTER_RAW_SIZE
+ + (regnum - ARM_F0_REGNUM) * FP_REGISTER_RAW_SIZE);
+ else
+ return (NUM_GREGS * INT_REGISTER_RAW_SIZE
+ + NUM_FREGS * FP_REGISTER_RAW_SIZE
+ + (regnum - ARM_FPS_REGNUM) * STATUS_REGISTER_SIZE);
+}
+
+/* Number of bytes of storage in the actual machine representation for
+ register N. All registers are 4 bytes, except fp0 - fp7, which are
+ 12 bytes in length. */
+
+static int
+arm_register_raw_size (int regnum)
+{
+ if (regnum < ARM_F0_REGNUM)
+ return INT_REGISTER_RAW_SIZE;
+ else if (regnum < ARM_FPS_REGNUM)
+ return FP_REGISTER_RAW_SIZE;
+ else
+ return STATUS_REGISTER_SIZE;
+}
+
+/* Number of bytes of storage in a program's representation
+ for register N. */
+static int
+arm_register_virtual_size (int regnum)
+{
+ if (regnum < ARM_F0_REGNUM)
+ return INT_REGISTER_VIRTUAL_SIZE;
+ else if (regnum < ARM_FPS_REGNUM)
+ return FP_REGISTER_VIRTUAL_SIZE;
+ else
+ return STATUS_REGISTER_SIZE;
+}
+
+/* Map GDB internal REGNUM onto the Arm simulator register numbers. */
+static int
+arm_register_sim_regno (int regnum)
+{
+ int reg = regnum;
+ gdb_assert (reg >= 0 && reg < NUM_REGS);
+
+ if (reg < NUM_GREGS)
+ return SIM_ARM_R0_REGNUM + reg;
+ reg -= NUM_GREGS;
+
+ if (reg < NUM_FREGS)
+ return SIM_ARM_FP0_REGNUM + reg;
+ reg -= NUM_FREGS;
+
+ if (reg < NUM_SREGS)
+ return SIM_ARM_FPS_REGNUM + reg;
+ reg -= NUM_SREGS;
+
+ internal_error (__FILE__, __LINE__, "Bad REGNUM %d", regnum);
+}
+
+/* NOTE: cagney/2001-08-20: Both convert_from_extended() and
+ convert_to_extended() use floatformat_arm_ext_littlebyte_bigword.
+ It is thought that this is is the floating-point register format on
+ little-endian systems. */
+
+static void
+convert_from_extended (void *ptr, void *dbl)
+{
+ DOUBLEST d;
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ floatformat_to_doublest (&floatformat_arm_ext_big, ptr, &d);
+ else
+ floatformat_to_doublest (&floatformat_arm_ext_littlebyte_bigword,
+ ptr, &d);
+ floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &d, dbl);
+}
+
+static void
+convert_to_extended (void *dbl, void *ptr)
+{
+ DOUBLEST d;
+ floatformat_to_doublest (TARGET_DOUBLE_FORMAT, ptr, &d);
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ floatformat_from_doublest (&floatformat_arm_ext_big, &d, dbl);
+ else
+ floatformat_from_doublest (&floatformat_arm_ext_littlebyte_bigword,
+ &d, dbl);
+}
+
+static int
+condition_true (unsigned long cond, unsigned long status_reg)
+{
+ if (cond == INST_AL || cond == INST_NV)
+ return 1;
+
+ switch (cond)
+ {
+ case INST_EQ:
+ return ((status_reg & FLAG_Z) != 0);
+ case INST_NE:
+ return ((status_reg & FLAG_Z) == 0);
+ case INST_CS:
+ return ((status_reg & FLAG_C) != 0);
+ case INST_CC:
+ return ((status_reg & FLAG_C) == 0);
+ case INST_MI:
+ return ((status_reg & FLAG_N) != 0);
+ case INST_PL:
+ return ((status_reg & FLAG_N) == 0);
+ case INST_VS:
+ return ((status_reg & FLAG_V) != 0);
+ case INST_VC:
+ return ((status_reg & FLAG_V) == 0);
+ case INST_HI:
+ return ((status_reg & (FLAG_C | FLAG_Z)) == FLAG_C);
+ case INST_LS:
+ return ((status_reg & (FLAG_C | FLAG_Z)) != FLAG_C);
+ case INST_GE:
+ return (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0));
+ case INST_LT:
+ return (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0));
+ case INST_GT:
+ return (((status_reg & FLAG_Z) == 0) &&
+ (((status_reg & FLAG_N) == 0) == ((status_reg & FLAG_V) == 0)));
+ case INST_LE:
+ return (((status_reg & FLAG_Z) != 0) ||
+ (((status_reg & FLAG_N) == 0) != ((status_reg & FLAG_V) == 0)));
+ }
+ return 1;
+}
+
+/* Support routines for single stepping. Calculate the next PC value. */
+#define submask(x) ((1L << ((x) + 1)) - 1)
+#define bit(obj,st) (((obj) >> (st)) & 1)
+#define bits(obj,st,fn) (((obj) >> (st)) & submask ((fn) - (st)))
+#define sbits(obj,st,fn) \
+ ((long) (bits(obj,st,fn) | ((long) bit(obj,fn) * ~ submask (fn - st))))
+#define BranchDest(addr,instr) \
+ ((CORE_ADDR) (((long) (addr)) + 8 + (sbits (instr, 0, 23) << 2)))
+#define ARM_PC_32 1
+
+static unsigned long
+shifted_reg_val (unsigned long inst, int carry, unsigned long pc_val,
+ unsigned long status_reg)
+{
+ unsigned long res, shift;
+ int rm = bits (inst, 0, 3);
+ unsigned long shifttype = bits (inst, 5, 6);
+
+ if (bit (inst, 4))
+ {
+ int rs = bits (inst, 8, 11);
+ shift = (rs == 15 ? pc_val + 8 : read_register (rs)) & 0xFF;
+ }
+ else
+ shift = bits (inst, 7, 11);
+
+ res = (rm == 15
+ ? ((pc_val | (ARM_PC_32 ? 0 : status_reg))
+ + (bit (inst, 4) ? 12 : 8))
+ : read_register (rm));
+
+ switch (shifttype)
+ {
+ case 0: /* LSL */
+ res = shift >= 32 ? 0 : res << shift;
+ break;
+
+ case 1: /* LSR */
+ res = shift >= 32 ? 0 : res >> shift;
+ break;
+
+ case 2: /* ASR */
+ if (shift >= 32)
+ shift = 31;
+ res = ((res & 0x80000000L)
+ ? ~((~res) >> shift) : res >> shift);
+ break;
+
+ case 3: /* ROR/RRX */
+ shift &= 31;
+ if (shift == 0)
+ res = (res >> 1) | (carry ? 0x80000000L : 0);
+ else
+ res = (res >> shift) | (res << (32 - shift));
+ break;
+ }
+
+ return res & 0xffffffff;
+}
+
+/* Return number of 1-bits in VAL. */
+
+static int
+bitcount (unsigned long val)
+{
+ int nbits;
+ for (nbits = 0; val != 0; nbits++)
+ val &= val - 1; /* delete rightmost 1-bit in val */
+ return nbits;
+}
+
+CORE_ADDR
+thumb_get_next_pc (CORE_ADDR pc)
+{
+ unsigned long pc_val = ((unsigned long) pc) + 4; /* PC after prefetch */
+ unsigned short inst1 = read_memory_integer (pc, 2);
+ CORE_ADDR nextpc = pc + 2; /* default is next instruction */
+ unsigned long offset;
+
+ if ((inst1 & 0xff00) == 0xbd00) /* pop {rlist, pc} */
+ {
+ CORE_ADDR sp;
+
+ /* Fetch the saved PC from the stack. It's stored above
+ all of the other registers. */
+ offset = bitcount (bits (inst1, 0, 7)) * REGISTER_SIZE;
+ sp = read_register (ARM_SP_REGNUM);
+ nextpc = (CORE_ADDR) read_memory_integer (sp + offset, 4);
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ }
+ else if ((inst1 & 0xf000) == 0xd000) /* conditional branch */
+ {
+ unsigned long status = read_register (ARM_PS_REGNUM);
+ unsigned long cond = bits (inst1, 8, 11);
+ if (cond != 0x0f && condition_true (cond, status)) /* 0x0f = SWI */
+ nextpc = pc_val + (sbits (inst1, 0, 7) << 1);
+ }
+ else if ((inst1 & 0xf800) == 0xe000) /* unconditional branch */
+ {
+ nextpc = pc_val + (sbits (inst1, 0, 10) << 1);
+ }
+ else if ((inst1 & 0xf800) == 0xf000) /* long branch with link */
+ {
+ unsigned short inst2 = read_memory_integer (pc + 2, 2);
+ offset = (sbits (inst1, 0, 10) << 12) + (bits (inst2, 0, 10) << 1);
+ nextpc = pc_val + offset;
+ }
+
+ return nextpc;
+}
+
+CORE_ADDR
+arm_get_next_pc (CORE_ADDR pc)
+{
+ unsigned long pc_val;
+ unsigned long this_instr;
+ unsigned long status;
+ CORE_ADDR nextpc;
+
+ if (arm_pc_is_thumb (pc))
+ return thumb_get_next_pc (pc);
+
+ pc_val = (unsigned long) pc;
+ this_instr = read_memory_integer (pc, 4);
+ status = read_register (ARM_PS_REGNUM);
+ nextpc = (CORE_ADDR) (pc_val + 4); /* Default case */
+
+ if (condition_true (bits (this_instr, 28, 31), status))
+ {
+ switch (bits (this_instr, 24, 27))
+ {
+ case 0x0:
+ case 0x1: /* data processing */
+ case 0x2:
+ case 0x3:
+ {
+ unsigned long operand1, operand2, result = 0;
+ unsigned long rn;
+ int c;
+
+ if (bits (this_instr, 12, 15) != 15)
+ break;
+
+ if (bits (this_instr, 22, 25) == 0
+ && bits (this_instr, 4, 7) == 9) /* multiply */
+ error ("Illegal update to pc in instruction");
+
+ /* Multiply into PC */
+ c = (status & FLAG_C) ? 1 : 0;
+ rn = bits (this_instr, 16, 19);
+ operand1 = (rn == 15) ? pc_val + 8 : read_register (rn);
+
+ if (bit (this_instr, 25))
+ {
+ unsigned long immval = bits (this_instr, 0, 7);
+ unsigned long rotate = 2 * bits (this_instr, 8, 11);
+ operand2 = ((immval >> rotate) | (immval << (32 - rotate)))
+ & 0xffffffff;
+ }
+ else /* operand 2 is a shifted register */
+ operand2 = shifted_reg_val (this_instr, c, pc_val, status);
+
+ switch (bits (this_instr, 21, 24))
+ {
+ case 0x0: /*and */
+ result = operand1 & operand2;
+ break;
+
+ case 0x1: /*eor */
+ result = operand1 ^ operand2;
+ break;
+
+ case 0x2: /*sub */
+ result = operand1 - operand2;
+ break;
+
+ case 0x3: /*rsb */
+ result = operand2 - operand1;
+ break;
+
+ case 0x4: /*add */
+ result = operand1 + operand2;
+ break;
+
+ case 0x5: /*adc */
+ result = operand1 + operand2 + c;
+ break;
+
+ case 0x6: /*sbc */
+ result = operand1 - operand2 + c;
+ break;
+
+ case 0x7: /*rsc */
+ result = operand2 - operand1 + c;
+ break;
+
+ case 0x8:
+ case 0x9:
+ case 0xa:
+ case 0xb: /* tst, teq, cmp, cmn */
+ result = (unsigned long) nextpc;
+ break;
+
+ case 0xc: /*orr */
+ result = operand1 | operand2;
+ break;
+
+ case 0xd: /*mov */
+ /* Always step into a function. */
+ result = operand2;
+ break;
+
+ case 0xe: /*bic */
+ result = operand1 & ~operand2;
+ break;
+
+ case 0xf: /*mvn */
+ result = ~operand2;
+ break;
+ }
+ nextpc = (CORE_ADDR) ADDR_BITS_REMOVE (result);
+
+ if (nextpc == pc)
error ("Infinite loop detected");
break;
}
-
- case 0x4: case 0x5: /* data transfer */
- case 0x6: case 0x7:
+
+ case 0x4:
+ case 0x5: /* data transfer */
+ case 0x6:
+ case 0x7:
if (bit (this_instr, 20))
{
/* load */
if (bits (this_instr, 12, 15) == 15)
{
/* rd == pc */
- unsigned long rn;
+ unsigned long rn;
unsigned long base;
-
+
if (bit (this_instr, 22))
error ("Illegal update to pc in instruction");
- /* byte write to PC */
- rn = bits (this_instr, 16, 19);
- base = (rn == 15) ? pc_val + 8 : read_register (rn);
- if (bit (this_instr, 24))
- {
- /* pre-indexed */
- int c = (status & FLAG_C) ? 1 : 0;
- unsigned long offset =
- (bit (this_instr, 25)
- ? shifted_reg_val (this_instr, c, pc_val)
- : bits (this_instr, 0, 11));
+ /* byte write to PC */
+ rn = bits (this_instr, 16, 19);
+ base = (rn == 15) ? pc_val + 8 : read_register (rn);
+ if (bit (this_instr, 24))
+ {
+ /* pre-indexed */
+ int c = (status & FLAG_C) ? 1 : 0;
+ unsigned long offset =
+ (bit (this_instr, 25)
+ ? shifted_reg_val (this_instr, c, pc_val, status)
+ : bits (this_instr, 0, 11));
+
+ if (bit (this_instr, 23))
+ base += offset;
+ else
+ base -= offset;
+ }
+ nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base,
+ 4);
+
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ }
+ }
+ break;
+
+ case 0x8:
+ case 0x9: /* block transfer */
+ if (bit (this_instr, 20))
+ {
+ /* LDM */
+ if (bit (this_instr, 15))
+ {
+ /* loading pc */
+ int offset = 0;
+
+ if (bit (this_instr, 23))
+ {
+ /* up */
+ unsigned long reglist = bits (this_instr, 0, 14);
+ offset = bitcount (reglist) * 4;
+ if (bit (this_instr, 24)) /* pre */
+ offset += 4;
+ }
+ else if (bit (this_instr, 24))
+ offset = -4;
+
+ {
+ unsigned long rn_val =
+ read_register (bits (this_instr, 16, 19));
+ nextpc =
+ (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val
+ + offset),
+ 4);
+ }
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ }
+ }
+ break;
+
+ case 0xb: /* branch & link */
+ case 0xa: /* branch */
+ {
+ nextpc = BranchDest (pc, this_instr);
+
+ nextpc = ADDR_BITS_REMOVE (nextpc);
+ if (nextpc == pc)
+ error ("Infinite loop detected");
+ break;
+ }
+
+ case 0xc:
+ case 0xd:
+ case 0xe: /* coproc ops */
+ case 0xf: /* SWI */
+ break;
+
+ default:
+ fprintf_filtered (gdb_stderr, "Bad bit-field extraction\n");
+ return (pc);
+ }
+ }
+
+ return nextpc;
+}
+
+/* single_step() is called just before we want to resume the inferior,
+ if we want to single-step it but there is no hardware or kernel
+ single-step support. We find the target of the coming instruction
+ and breakpoint it.
+
+ single_step() is also called just after the inferior stops. If we
+ had set up a simulated single-step, we undo our damage. */
+
+static void
+arm_software_single_step (enum target_signal sig, int insert_bpt)
+{
+ static int next_pc; /* State between setting and unsetting. */
+ static char break_mem[BREAKPOINT_MAX]; /* Temporary storage for mem@bpt */
+
+ if (insert_bpt)
+ {
+ next_pc = arm_get_next_pc (read_register (ARM_PC_REGNUM));
+ target_insert_breakpoint (next_pc, break_mem);
+ }
+ else
+ target_remove_breakpoint (next_pc, break_mem);
+}
+
+#include "bfd-in2.h"
+#include "libcoff.h"
+
+static int
+gdb_print_insn_arm (bfd_vma memaddr, disassemble_info *info)
+{
+ if (arm_pc_is_thumb (memaddr))
+ {
+ static asymbol *asym;
+ static combined_entry_type ce;
+ static struct coff_symbol_struct csym;
+ static struct _bfd fake_bfd;
+ static bfd_target fake_target;
+
+ if (csym.native == NULL)
+ {
+ /* Create a fake symbol vector containing a Thumb symbol.
+ This is solely so that the code in print_insn_little_arm()
+ and print_insn_big_arm() in opcodes/arm-dis.c will detect
+ the presence of a Thumb symbol and switch to decoding
+ Thumb instructions. */
+
+ fake_target.flavour = bfd_target_coff_flavour;
+ fake_bfd.xvec = &fake_target;
+ ce.u.syment.n_sclass = C_THUMBEXTFUNC;
+ csym.native = &ce;
+ csym.symbol.the_bfd = &fake_bfd;
+ csym.symbol.name = "fake";
+ asym = (asymbol *) & csym;
+ }
+
+ memaddr = UNMAKE_THUMB_ADDR (memaddr);
+ info->symbols = &asym;
+ }
+ else
+ info->symbols = NULL;
+
+ if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG)
+ return print_insn_big_arm (memaddr, info);
+ else
+ return print_insn_little_arm (memaddr, info);
+}
+
+/* The following define instruction sequences that will cause ARM
+ cpu's to take an undefined instruction trap. These are used to
+ signal a breakpoint to GDB.
+
+ The newer ARMv4T cpu's are capable of operating in ARM or Thumb
+ modes. A different instruction is required for each mode. The ARM
+ cpu's can also be big or little endian. Thus four different
+ instructions are needed to support all cases.
+
+ Note: ARMv4 defines several new instructions that will take the
+ undefined instruction trap. ARM7TDMI is nominally ARMv4T, but does
+ not in fact add the new instructions. The new undefined
+ instructions in ARMv4 are all instructions that had no defined
+ behaviour in earlier chips. There is no guarantee that they will
+ raise an exception, but may be treated as NOP's. In practice, it
+ may only safe to rely on instructions matching:
+
+ 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
+ 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ C C C C 0 1 1 x x x x x x x x x x x x x x x x x x x x 1 x x x x
+
+ Even this may only true if the condition predicate is true. The
+ following use a condition predicate of ALWAYS so it is always TRUE.
+
+ There are other ways of forcing a breakpoint. GNU/Linux, RISC iX,
+ and NetBSD all use a software interrupt rather than an undefined
+ instruction to force a trap. This can be handled by by the
+ abi-specific code during establishment of the gdbarch vector. */
+
+
+/* NOTE rearnsha 2002-02-18: for now we allow a non-multi-arch gdb to
+ override these definitions. */
+#ifndef ARM_LE_BREAKPOINT
+#define ARM_LE_BREAKPOINT {0xFE,0xDE,0xFF,0xE7}
+#endif
+#ifndef ARM_BE_BREAKPOINT
+#define ARM_BE_BREAKPOINT {0xE7,0xFF,0xDE,0xFE}
+#endif
+#ifndef THUMB_LE_BREAKPOINT
+#define THUMB_LE_BREAKPOINT {0xfe,0xdf}
+#endif
+#ifndef THUMB_BE_BREAKPOINT
+#define THUMB_BE_BREAKPOINT {0xdf,0xfe}
+#endif
+
+static const char arm_default_arm_le_breakpoint[] = ARM_LE_BREAKPOINT;
+static const char arm_default_arm_be_breakpoint[] = ARM_BE_BREAKPOINT;
+static const char arm_default_thumb_le_breakpoint[] = THUMB_LE_BREAKPOINT;
+static const char arm_default_thumb_be_breakpoint[] = THUMB_BE_BREAKPOINT;
+
+/* Determine the type and size of breakpoint to insert at PCPTR. Uses
+ the program counter value to determine whether a 16-bit or 32-bit
+ breakpoint should be used. It returns a pointer to a string of
+ bytes that encode a breakpoint instruction, stores the length of
+ the string to *lenptr, and adjusts the program counter (if
+ necessary) to point to the actual memory location where the
+ breakpoint should be inserted. */
+
+/* XXX ??? from old tm-arm.h: if we're using RDP, then we're inserting
+ breakpoints and storing their handles instread of what was in
+ memory. It is nice that this is the same size as a handle -
+ otherwise remote-rdp will have to change. */
+
+static const unsigned char *
+arm_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ if (arm_pc_is_thumb (*pcptr) || arm_pc_is_thumb_dummy (*pcptr))
+ {
+ *pcptr = UNMAKE_THUMB_ADDR (*pcptr);
+ *lenptr = tdep->thumb_breakpoint_size;
+ return tdep->thumb_breakpoint;
+ }
+ else
+ {
+ *lenptr = tdep->arm_breakpoint_size;
+ return tdep->arm_breakpoint;
+ }
+}
+
+/* Extract from an array REGBUF containing the (raw) register state a
+ function return value of type TYPE, and copy that, in virtual
+ format, into VALBUF. */
+
+static void
+arm_extract_return_value (struct type *type,
+ char regbuf[REGISTER_BYTES],
+ char *valbuf)
+{
+ if (TYPE_CODE_FLT == TYPE_CODE (type))
+ {
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ switch (tdep->fp_model)
+ {
+ case ARM_FLOAT_FPA:
+ convert_from_extended (®buf[REGISTER_BYTE (ARM_F0_REGNUM)],
+ valbuf);
+ break;
+
+ case ARM_FLOAT_SOFT:
+ case ARM_FLOAT_SOFT_VFP:
+ memcpy (valbuf, ®buf[REGISTER_BYTE (ARM_A1_REGNUM)],
+ TYPE_LENGTH (type));
+ break;
+
+ default:
+ internal_error
+ (__FILE__, __LINE__,
+ "arm_extract_return_value: Floating point model not supported");
+ break;
+ }
+ }
+ else
+ memcpy (valbuf, ®buf[REGISTER_BYTE (ARM_A1_REGNUM)],
+ TYPE_LENGTH (type));
+}
+
+/* Extract from an array REGBUF containing the (raw) register state
+ the address in which a function should return its structure value. */
+
+static CORE_ADDR
+arm_extract_struct_value_address (struct regcache *regcache)
+{
+ ULONGEST ret;
+
+ regcache_cooked_read_unsigned (regcache, ARM_A1_REGNUM, &ret);
+ return ret;
+}
+
+/* Will a function return an aggregate type in memory or in a
+ register? Return 0 if an aggregate type can be returned in a
+ register, 1 if it must be returned in memory. */
- if (bit (this_instr, 23))
- base += offset;
- else
- base -= offset;
- }
- nextpc = (CORE_ADDR) read_memory_integer ((CORE_ADDR) base,
- 4);
-
- nextpc = ADDR_BITS_REMOVE (nextpc);
+static int
+arm_use_struct_convention (int gcc_p, struct type *type)
+{
+ int nRc;
+ register enum type_code code;
+
+ /* In the ARM ABI, "integer" like aggregate types are returned in
+ registers. For an aggregate type to be integer like, its size
+ must be less than or equal to REGISTER_SIZE and the offset of
+ each addressable subfield must be zero. Note that bit fields are
+ not addressable, and all addressable subfields of unions always
+ start at offset zero.
+
+ This function is based on the behaviour of GCC 2.95.1.
+ See: gcc/arm.c: arm_return_in_memory() for details.
+
+ Note: All versions of GCC before GCC 2.95.2 do not set up the
+ parameters correctly for a function returning the following
+ structure: struct { float f;}; This should be returned in memory,
+ not a register. Richard Earnshaw sent me a patch, but I do not
+ know of any way to detect if a function like the above has been
+ compiled with the correct calling convention. */
+
+ /* All aggregate types that won't fit in a register must be returned
+ in memory. */
+ if (TYPE_LENGTH (type) > REGISTER_SIZE)
+ {
+ return 1;
+ }
- if (nextpc == pc)
- error ("Infinite loop detected");
- }
+ /* The only aggregate types that can be returned in a register are
+ structs and unions. Arrays must be returned in memory. */
+ code = TYPE_CODE (type);
+ if ((TYPE_CODE_STRUCT != code) && (TYPE_CODE_UNION != code))
+ {
+ return 1;
+ }
+
+ /* Assume all other aggregate types can be returned in a register.
+ Run a check for structures, unions and arrays. */
+ nRc = 0;
+
+ if ((TYPE_CODE_STRUCT == code) || (TYPE_CODE_UNION == code))
+ {
+ int i;
+ /* Need to check if this struct/union is "integer" like. For
+ this to be true, its size must be less than or equal to
+ REGISTER_SIZE and the offset of each addressable subfield
+ must be zero. Note that bit fields are not addressable, and
+ unions always start at offset zero. If any of the subfields
+ is a floating point type, the struct/union cannot be an
+ integer type. */
+
+ /* For each field in the object, check:
+ 1) Is it FP? --> yes, nRc = 1;
+ 2) Is it addressable (bitpos != 0) and
+ not packed (bitsize == 0)?
+ --> yes, nRc = 1
+ */
+
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ enum type_code field_type_code;
+ field_type_code = TYPE_CODE (TYPE_FIELD_TYPE (type, i));
+
+ /* Is it a floating point type field? */
+ if (field_type_code == TYPE_CODE_FLT)
+ {
+ nRc = 1;
+ break;
}
- break;
-
- case 0x8: case 0x9: /* block transfer */
- if (bit (this_instr, 20))
+
+ /* If bitpos != 0, then we have to care about it. */
+ if (TYPE_FIELD_BITPOS (type, i) != 0)
{
- /* LDM */
- if (bit (this_instr, 15))
+ /* Bitfields are not addressable. If the field bitsize is
+ zero, then the field is not packed. Hence it cannot be
+ a bitfield or any other packed type. */
+ if (TYPE_FIELD_BITSIZE (type, i) == 0)
{
- /* loading pc */
- int offset = 0;
+ nRc = 1;
+ break;
+ }
+ }
+ }
+ }
- if (bit (this_instr, 23))
- {
- /* up */
- unsigned long reglist = bits (this_instr, 0, 14);
- unsigned long regbit;
+ return nRc;
+}
- for (; reglist != 0; reglist &= ~regbit)
- {
- regbit = reglist & (-reglist);
- offset += 4;
- }
+/* Write into appropriate registers a function return value of type
+ TYPE, given in virtual format. */
- if (bit (this_instr, 24)) /* pre */
- offset += 4;
- }
- else if (bit (this_instr, 24))
- offset = -4;
-
- {
- unsigned long rn_val =
- read_register (bits (this_instr, 16, 19));
- nextpc =
- (CORE_ADDR) read_memory_integer ((CORE_ADDR) (rn_val
- + offset),
- 4);
- }
- nextpc = ADDR_BITS_REMOVE (nextpc);
- if (nextpc == pc)
- error ("Infinite loop detected");
- }
- }
+static void
+arm_store_return_value (struct type *type, char *valbuf)
+{
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ {
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ char buf[ARM_MAX_REGISTER_RAW_SIZE];
+
+ switch (tdep->fp_model)
+ {
+ case ARM_FLOAT_FPA:
+
+ convert_to_extended (valbuf, buf);
+ deprecated_write_register_bytes (REGISTER_BYTE (ARM_F0_REGNUM), buf,
+ FP_REGISTER_RAW_SIZE);
break;
-
- case 0xb: /* branch & link */
- case 0xa: /* branch */
- {
- nextpc = BranchDest (pc, this_instr);
- nextpc = ADDR_BITS_REMOVE (nextpc);
- if (nextpc == pc)
- error ("Infinite loop detected");
- break;
- }
-
- case 0xc: case 0xd:
- case 0xe: /* coproc ops */
- case 0xf: /* SWI */
+ case ARM_FLOAT_SOFT:
+ case ARM_FLOAT_SOFT_VFP:
+ deprecated_write_register_bytes (ARM_A1_REGNUM, valbuf,
+ TYPE_LENGTH (type));
break;
default:
- fprintf (stderr, "Bad bit-field extraction\n");
- return (pc);
+ internal_error
+ (__FILE__, __LINE__,
+ "arm_store_return_value: Floating point model not supported");
+ break;
}
}
+ else
+ deprecated_write_register_bytes (ARM_A1_REGNUM, valbuf,
+ TYPE_LENGTH (type));
+}
- return nextpc;
+/* Store the address of the place in which to copy the structure the
+ subroutine will return. This is called from call_function. */
+
+static void
+arm_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
+{
+ write_register (ARM_A1_REGNUM, addr);
}
-void
-_initialize_arm_tdep ()
+static int
+arm_get_longjmp_target (CORE_ADDR *pc)
{
- tm_print_insn = print_insn_little_arm;
+ CORE_ADDR jb_addr;
+ char buf[INT_REGISTER_RAW_SIZE];
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ jb_addr = read_register (ARM_A1_REGNUM);
+
+ if (target_read_memory (jb_addr + tdep->jb_pc * tdep->jb_elt_size, buf,
+ INT_REGISTER_RAW_SIZE))
+ return 0;
- add_com ("othernames", class_obscure, arm_othernames,
- "Switch to the other set of register names.");
+ *pc = extract_address (buf, INT_REGISTER_RAW_SIZE);
+ return 1;
+}
+
+/* Return non-zero if the PC is inside a thumb call thunk. */
+
+int
+arm_in_call_stub (CORE_ADDR pc, char *name)
+{
+ CORE_ADDR start_addr;
+
+ /* Find the starting address of the function containing the PC. If
+ the caller didn't give us a name, look it up at the same time. */
+ if (0 == find_pc_partial_function (pc, name ? NULL : &name,
+ &start_addr, NULL))
+ return 0;
+
+ return strncmp (name, "_call_via_r", 11) == 0;
+}
+
+/* If PC is in a Thumb call or return stub, return the address of the
+ target PC, which is in a register. The thunk functions are called
+ _called_via_xx, where x is the register name. The possible names
+ are r0-r9, sl, fp, ip, sp, and lr. */
+
+CORE_ADDR
+arm_skip_stub (CORE_ADDR pc)
+{
+ char *name;
+ CORE_ADDR start_addr;
+
+ /* Find the starting address and name of the function containing the PC. */
+ if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0)
+ return 0;
+
+ /* Call thunks always start with "_call_via_". */
+ if (strncmp (name, "_call_via_", 10) == 0)
+ {
+ /* Use the name suffix to determine which register contains the
+ target PC. */
+ static char *table[15] =
+ {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ "r8", "r9", "sl", "fp", "ip", "sp", "lr"
+ };
+ int regno;
+
+ for (regno = 0; regno <= 14; regno++)
+ if (strcmp (&name[10], table[regno]) == 0)
+ return read_register (regno);
+ }
+
+ return 0; /* not a stub */
+}
+
+/* If the user changes the register disassembly flavor used for info
+ register and other commands, we have to also switch the flavor used
+ in opcodes for disassembly output. This function is run in the set
+ disassembly_flavor command, and does that. */
+
+static void
+set_disassembly_flavor_sfunc (char *args, int from_tty,
+ struct cmd_list_element *c)
+{
+ set_disassembly_flavor ();
+}
+\f
+/* Return the ARM register name corresponding to register I. */
+static const char *
+arm_register_name (int i)
+{
+ return arm_register_names[i];
+}
+
+static void
+set_disassembly_flavor (void)
+{
+ const char *setname, *setdesc, **regnames;
+ int numregs, j;
+
+ /* Find the flavor that the user wants in the opcodes table. */
+ int current = 0;
+ numregs = get_arm_regnames (current, &setname, &setdesc, ®names);
+ while ((disassembly_flavor != setname)
+ && (current < num_flavor_options))
+ get_arm_regnames (++current, &setname, &setdesc, ®names);
+ current_option = current;
+
+ /* Fill our copy. */
+ for (j = 0; j < numregs; j++)
+ arm_register_names[j] = (char *) regnames[j];
+
+ /* Adjust case. */
+ if (isupper (*regnames[ARM_PC_REGNUM]))
+ {
+ arm_register_names[ARM_FPS_REGNUM] = "FPS";
+ arm_register_names[ARM_PS_REGNUM] = "CPSR";
+ }
+ else
+ {
+ arm_register_names[ARM_FPS_REGNUM] = "fps";
+ arm_register_names[ARM_PS_REGNUM] = "cpsr";
+ }
+
+ /* Synchronize the disassembler. */
+ set_arm_regname_option (current);
+}
+
+/* arm_othernames implements the "othernames" command. This is kind
+ of hacky, and I prefer the set-show disassembly-flavor which is
+ also used for the x86 gdb. I will keep this around, however, in
+ case anyone is actually using it. */
+
+static void
+arm_othernames (char *names, int n)
+{
+ /* Circle through the various flavors. */
+ current_option = (current_option + 1) % num_flavor_options;
+
+ disassembly_flavor = valid_flavors[current_option];
+ set_disassembly_flavor ();
+}
+
+/* Fetch, and possibly build, an appropriate link_map_offsets structure
+ for ARM linux targets using the struct offsets defined in <link.h>.
+ Note, however, that link.h is not actually referred to in this file.
+ Instead, the relevant structs offsets were obtained from examining
+ link.h. (We can't refer to link.h from this file because the host
+ system won't necessarily have it, or if it does, the structs which
+ it defines will refer to the host system, not the target). */
+struct link_map_offsets *
+arm_linux_svr4_fetch_link_map_offsets (void)
+{
+ static struct link_map_offsets lmo;
+ static struct link_map_offsets *lmp = 0;
+
+ if (lmp == 0)
+ {
+ lmp = &lmo;
+
+ lmo.r_debug_size = 8; /* Actual size is 20, but this is all we
+ need. */
+
+ lmo.r_map_offset = 4;
+ lmo.r_map_size = 4;
+
+ lmo.link_map_size = 20; /* Actual size is 552, but this is all we
+ need. */
+
+ lmo.l_addr_offset = 0;
+ lmo.l_addr_size = 4;
+
+ lmo.l_name_offset = 4;
+ lmo.l_name_size = 4;
+
+ lmo.l_next_offset = 12;
+ lmo.l_next_size = 4;
+
+ lmo.l_prev_offset = 16;
+ lmo.l_prev_size = 4;
+ }
+
+ return lmp;
+}
+
+/* Test whether the coff symbol specific value corresponds to a Thumb
+ function. */
+
+static int
+coff_sym_is_thumb (int val)
+{
+ return (val == C_THUMBEXT ||
+ val == C_THUMBSTAT ||
+ val == C_THUMBEXTFUNC ||
+ val == C_THUMBSTATFUNC ||
+ val == C_THUMBLABEL);
+}
+
+/* arm_coff_make_msymbol_special()
+ arm_elf_make_msymbol_special()
+
+ These functions test whether the COFF or ELF symbol corresponds to
+ an address in thumb code, and set a "special" bit in a minimal
+ symbol to indicate that it does. */
+
+static void
+arm_elf_make_msymbol_special(asymbol *sym, struct minimal_symbol *msym)
+{
+ /* Thumb symbols are of type STT_LOPROC, (synonymous with
+ STT_ARM_TFUNC). */
+ if (ELF_ST_TYPE (((elf_symbol_type *)sym)->internal_elf_sym.st_info)
+ == STT_LOPROC)
+ MSYMBOL_SET_SPECIAL (msym);
+}
+
+static void
+arm_coff_make_msymbol_special(int val, struct minimal_symbol *msym)
+{
+ if (coff_sym_is_thumb (val))
+ MSYMBOL_SET_SPECIAL (msym);
+}
+
+\f
+static enum gdb_osabi
+arm_elf_osabi_sniffer (bfd *abfd)
+{
+ unsigned int elfosabi, eflags;
+ enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
+
+ elfosabi = elf_elfheader (abfd)->e_ident[EI_OSABI];
+
+ switch (elfosabi)
+ {
+ case ELFOSABI_NONE:
+ /* When elfosabi is ELFOSABI_NONE (0), then the ELF structures in the
+ file are conforming to the base specification for that machine
+ (there are no OS-specific extensions). In order to determine the
+ real OS in use we must look for OS notes that have been added. */
+ bfd_map_over_sections (abfd,
+ generic_elf_osabi_sniff_abi_tag_sections,
+ &osabi);
+ if (osabi == GDB_OSABI_UNKNOWN)
+ {
+ /* Existing ARM tools don't set this field, so look at the EI_FLAGS
+ field for more information. */
+ eflags = EF_ARM_EABI_VERSION(elf_elfheader(abfd)->e_flags);
+ switch (eflags)
+ {
+ case EF_ARM_EABI_VER1:
+ osabi = GDB_OSABI_ARM_EABI_V1;
+ break;
+
+ case EF_ARM_EABI_VER2:
+ osabi = GDB_OSABI_ARM_EABI_V2;
+ break;
+
+ case EF_ARM_EABI_UNKNOWN:
+ /* Assume GNU tools. */
+ osabi = GDB_OSABI_ARM_APCS;
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ "arm_elf_osabi_sniffer: Unknown ARM EABI "
+ "version 0x%x", eflags);
+ }
+ }
+ break;
+
+ case ELFOSABI_ARM:
+ /* GNU tools use this value. Check note sections in this case,
+ as well. */
+ bfd_map_over_sections (abfd,
+ generic_elf_osabi_sniff_abi_tag_sections,
+ &osabi);
+ if (osabi == GDB_OSABI_UNKNOWN)
+ {
+ /* Assume APCS ABI. */
+ osabi = GDB_OSABI_ARM_APCS;
+ }
+ break;
+
+ case ELFOSABI_FREEBSD:
+ osabi = GDB_OSABI_FREEBSD_ELF;
+ break;
+
+ case ELFOSABI_NETBSD:
+ osabi = GDB_OSABI_NETBSD_ELF;
+ break;
+
+ case ELFOSABI_LINUX:
+ osabi = GDB_OSABI_LINUX;
+ break;
+ }
+
+ return osabi;
+}
+
+\f
+/* Initialize the current architecture based on INFO. If possible,
+ re-use an architecture from ARCHES, which is a list of
+ architectures already created during this debugging session.
+
+ Called e.g. at program startup, when reading a core file, and when
+ reading a binary file. */
+
+static struct gdbarch *
+arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
+{
+ struct gdbarch_tdep *tdep;
+ struct gdbarch *gdbarch;
+ enum gdb_osabi osabi = GDB_OSABI_UNKNOWN;
+
+ /* Try to deterimine the ABI of the object we are loading. */
+
+ if (info.abfd != NULL)
+ {
+ osabi = gdbarch_lookup_osabi (info.abfd);
+ if (osabi == GDB_OSABI_UNKNOWN)
+ {
+ switch (bfd_get_flavour (info.abfd))
+ {
+ case bfd_target_aout_flavour:
+ /* Assume it's an old APCS-style ABI. */
+ osabi = GDB_OSABI_ARM_APCS;
+ break;
+
+ case bfd_target_coff_flavour:
+ /* Assume it's an old APCS-style ABI. */
+ /* XXX WinCE? */
+ osabi = GDB_OSABI_ARM_APCS;
+ break;
+
+ default:
+ /* Leave it as "unknown". */
+ }
+ }
+ }
+
+ /* Find a candidate among extant architectures. */
+ for (arches = gdbarch_list_lookup_by_info (arches, &info);
+ arches != NULL;
+ arches = gdbarch_list_lookup_by_info (arches->next, &info))
+ {
+ /* Make sure the ABI selection matches. */
+ tdep = gdbarch_tdep (arches->gdbarch);
+ if (tdep && tdep->osabi == osabi)
+ return arches->gdbarch;
+ }
+
+ tdep = xmalloc (sizeof (struct gdbarch_tdep));
+ gdbarch = gdbarch_alloc (&info, tdep);
+
+ tdep->osabi = osabi;
+
+ /* This is the way it has always defaulted. */
+ tdep->fp_model = ARM_FLOAT_FPA;
+
+ /* Breakpoints. */
+ switch (info.byte_order)
+ {
+ case BFD_ENDIAN_BIG:
+ tdep->arm_breakpoint = arm_default_arm_be_breakpoint;
+ tdep->arm_breakpoint_size = sizeof (arm_default_arm_be_breakpoint);
+ tdep->thumb_breakpoint = arm_default_thumb_be_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_be_breakpoint);
+
+ break;
+
+ case BFD_ENDIAN_LITTLE:
+ tdep->arm_breakpoint = arm_default_arm_le_breakpoint;
+ tdep->arm_breakpoint_size = sizeof (arm_default_arm_le_breakpoint);
+ tdep->thumb_breakpoint = arm_default_thumb_le_breakpoint;
+ tdep->thumb_breakpoint_size = sizeof (arm_default_thumb_le_breakpoint);
+
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ "arm_gdbarch_init: bad byte order for float format");
+ }
+
+ /* On ARM targets char defaults to unsigned. */
+ set_gdbarch_char_signed (gdbarch, 0);
+
+ /* This should be low enough for everything. */
+ tdep->lowest_pc = 0x20;
+ tdep->jb_pc = -1; /* Longjump support not enabled by default. */
+
+#if OLD_STYLE_ARM_DUMMY_FRAMES
+ /* NOTE: cagney/2002-05-07: Enable the below to restore the old ARM
+ specific (non-generic) dummy frame code. Might be useful if
+ there appears to be a problem with the generic dummy frame
+ mechanism that replaced it. */
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 0);
+
+ /* Call dummy code. */
+ set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ /* We have to give this a value now, even though we will re-set it
+ during each call to arm_fix_call_dummy. */
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 8);
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+
+ set_gdbarch_call_dummy_words (gdbarch, arm_call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (arm_call_dummy_words));
+ set_gdbarch_call_dummy_start_offset (gdbarch, 0);
+ set_gdbarch_call_dummy_length (gdbarch, 0);
+
+ set_gdbarch_fix_call_dummy (gdbarch, arm_fix_call_dummy);
+
+ set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack);
+#else
+ set_gdbarch_use_generic_dummy_frames (gdbarch, 1);
+ set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
+
+ set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1);
+ set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0);
+
+ set_gdbarch_call_dummy_p (gdbarch, 1);
+ set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0);
+
+ set_gdbarch_call_dummy_words (gdbarch, arm_call_dummy_words);
+ set_gdbarch_sizeof_call_dummy_words (gdbarch, 0);
+ set_gdbarch_call_dummy_start_offset (gdbarch, 0);
+ set_gdbarch_call_dummy_length (gdbarch, 0);
+
+ set_gdbarch_fix_call_dummy (gdbarch, generic_fix_call_dummy);
+ set_gdbarch_pc_in_call_dummy (gdbarch, generic_pc_in_call_dummy);
+
+ set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
+ set_gdbarch_push_return_address (gdbarch, arm_push_return_address);
+#endif
+
+ set_gdbarch_get_saved_register (gdbarch, deprecated_generic_get_saved_register);
+ set_gdbarch_push_arguments (gdbarch, arm_push_arguments);
+ set_gdbarch_coerce_float_to_double (gdbarch,
+ standard_coerce_float_to_double);
+
+ /* Frame handling. */
+ set_gdbarch_frame_chain_valid (gdbarch, arm_frame_chain_valid);
+ set_gdbarch_init_extra_frame_info (gdbarch, arm_init_extra_frame_info);
+ set_gdbarch_read_fp (gdbarch, arm_read_fp);
+ set_gdbarch_frame_chain (gdbarch, arm_frame_chain);
+ set_gdbarch_frameless_function_invocation
+ (gdbarch, arm_frameless_function_invocation);
+ set_gdbarch_frame_saved_pc (gdbarch, arm_frame_saved_pc);
+ set_gdbarch_frame_args_address (gdbarch, arm_frame_args_address);
+ set_gdbarch_frame_locals_address (gdbarch, arm_frame_locals_address);
+ set_gdbarch_frame_num_args (gdbarch, arm_frame_num_args);
+ set_gdbarch_frame_args_skip (gdbarch, 0);
+ set_gdbarch_frame_init_saved_regs (gdbarch, arm_frame_init_saved_regs);
+#if OLD_STYLE_ARM_DUMMY_FRAMES
+ /* NOTE: cagney/2002-05-07: Enable the below to restore the old ARM
+ specific (non-generic) dummy frame code. Might be useful if
+ there appears to be a problem with the generic dummy frame
+ mechanism that replaced it. */
+ set_gdbarch_push_dummy_frame (gdbarch, arm_push_dummy_frame);
+#else
+ set_gdbarch_push_dummy_frame (gdbarch, generic_push_dummy_frame);
+#endif
+ set_gdbarch_pop_frame (gdbarch, arm_pop_frame);
+
+ /* Address manipulation. */
+ set_gdbarch_smash_text_address (gdbarch, arm_smash_text_address);
+ set_gdbarch_addr_bits_remove (gdbarch, arm_addr_bits_remove);
+
+ /* Offset from address of function to start of its code. */
+ set_gdbarch_function_start_offset (gdbarch, 0);
+
+ /* Advance PC across function entry code. */
+ set_gdbarch_skip_prologue (gdbarch, arm_skip_prologue);
+
+ /* Get the PC when a frame might not be available. */
+ set_gdbarch_saved_pc_after_call (gdbarch, arm_saved_pc_after_call);
+
+ /* The stack grows downward. */
+ set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
+
+ /* Breakpoint manipulation. */
+ set_gdbarch_breakpoint_from_pc (gdbarch, arm_breakpoint_from_pc);
+ set_gdbarch_decr_pc_after_break (gdbarch, 0);
+
+ /* Information about registers, etc. */
+ set_gdbarch_print_float_info (gdbarch, arm_print_float_info);
+ set_gdbarch_fp_regnum (gdbarch, ARM_FP_REGNUM); /* ??? */
+ set_gdbarch_sp_regnum (gdbarch, ARM_SP_REGNUM);
+ set_gdbarch_pc_regnum (gdbarch, ARM_PC_REGNUM);
+ set_gdbarch_register_byte (gdbarch, arm_register_byte);
+ set_gdbarch_register_bytes (gdbarch,
+ (NUM_GREGS * INT_REGISTER_RAW_SIZE
+ + NUM_FREGS * FP_REGISTER_RAW_SIZE
+ + NUM_SREGS * STATUS_REGISTER_SIZE));
+ set_gdbarch_num_regs (gdbarch, NUM_GREGS + NUM_FREGS + NUM_SREGS);
+ set_gdbarch_register_raw_size (gdbarch, arm_register_raw_size);
+ set_gdbarch_register_virtual_size (gdbarch, arm_register_virtual_size);
+ set_gdbarch_max_register_raw_size (gdbarch, FP_REGISTER_RAW_SIZE);
+ set_gdbarch_max_register_virtual_size (gdbarch, FP_REGISTER_VIRTUAL_SIZE);
+ set_gdbarch_register_virtual_type (gdbarch, arm_register_type);
+
+ /* Internal <-> external register number maps. */
+ set_gdbarch_register_sim_regno (gdbarch, arm_register_sim_regno);
+
+ /* Integer registers are 4 bytes. */
+ set_gdbarch_register_size (gdbarch, 4);
+ set_gdbarch_register_name (gdbarch, arm_register_name);
+
+ /* Returning results. */
+ set_gdbarch_deprecated_extract_return_value (gdbarch, arm_extract_return_value);
+ set_gdbarch_deprecated_store_return_value (gdbarch, arm_store_return_value);
+ set_gdbarch_store_struct_return (gdbarch, arm_store_struct_return);
+ set_gdbarch_use_struct_convention (gdbarch, arm_use_struct_convention);
+ set_gdbarch_extract_struct_value_address (gdbarch,
+ arm_extract_struct_value_address);
+
+ /* Single stepping. */
+ /* XXX For an RDI target we should ask the target if it can single-step. */
+ set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
+
+ /* Minsymbol frobbing. */
+ set_gdbarch_elf_make_msymbol_special (gdbarch, arm_elf_make_msymbol_special);
+ set_gdbarch_coff_make_msymbol_special (gdbarch,
+ arm_coff_make_msymbol_special);
+
+ /* Hook in the ABI-specific overrides, if they have been registered. */
+ gdbarch_init_osabi (info, gdbarch, osabi);
+
+ /* Now we have tuned the configuration, set a few final things,
+ based on what the OS ABI has told us. */
+
+ if (tdep->jb_pc >= 0)
+ set_gdbarch_get_longjmp_target (gdbarch, arm_get_longjmp_target);
+
+ /* Floating point sizes and format. */
+ switch (info.byte_order)
+ {
+ case BFD_ENDIAN_BIG:
+ set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_big);
+ set_gdbarch_double_format (gdbarch, &floatformat_ieee_double_big);
+ set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);
+
+ break;
+
+ case BFD_ENDIAN_LITTLE:
+ set_gdbarch_float_format (gdbarch, &floatformat_ieee_single_little);
+ if (tdep->fp_model == ARM_FLOAT_VFP
+ || tdep->fp_model == ARM_FLOAT_SOFT_VFP)
+ {
+ set_gdbarch_double_format (gdbarch, &floatformat_ieee_double_little);
+ set_gdbarch_long_double_format (gdbarch,
+ &floatformat_ieee_double_little);
+ }
+ else
+ {
+ set_gdbarch_double_format
+ (gdbarch, &floatformat_ieee_double_littlebyte_bigword);
+ set_gdbarch_long_double_format
+ (gdbarch, &floatformat_ieee_double_littlebyte_bigword);
+ }
+ break;
+
+ default:
+ internal_error (__FILE__, __LINE__,
+ "arm_gdbarch_init: bad byte order for float format");
+ }
+
+ /* We can't use SIZEOF_FRAME_SAVED_REGS here, since that still
+ references the old architecture vector, not the one we are
+ building here. */
+ if (prologue_cache.saved_regs != NULL)
+ xfree (prologue_cache.saved_regs);
+
+ /* We can't use NUM_REGS nor NUM_PSEUDO_REGS here, since that still
+ references the old architecture vector, not the one we are
+ building here. */
+ prologue_cache.saved_regs = (CORE_ADDR *)
+ xcalloc (1, (sizeof (CORE_ADDR)
+ * (gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch))));
+
+ return gdbarch;
+}
+
+static void
+arm_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ if (tdep == NULL)
+ return;
+
+ fprintf_unfiltered (file, "arm_dump_tdep: OS ABI = %s\n",
+ gdbarch_osabi_name (tdep->osabi));
+
+ fprintf_unfiltered (file, "arm_dump_tdep: Lowest pc = 0x%lx",
+ (unsigned long) tdep->lowest_pc);
+}
+
+static void
+arm_init_abi_eabi_v1 (struct gdbarch_info info,
+ struct gdbarch *gdbarch)
+{
+ /* Place-holder. */
+}
+
+static void
+arm_init_abi_eabi_v2 (struct gdbarch_info info,
+ struct gdbarch *gdbarch)
+{
+ /* Place-holder. */
+}
+
+static void
+arm_init_abi_apcs (struct gdbarch_info info,
+ struct gdbarch *gdbarch)
+{
+ /* Place-holder. */
+}
+
+void
+_initialize_arm_tdep (void)
+{
+ struct ui_file *stb;
+ long length;
+ struct cmd_list_element *new_cmd;
+ const char *setname;
+ const char *setdesc;
+ const char **regnames;
+ int numregs, i, j;
+ static char *helptext;
+
+ if (GDB_MULTI_ARCH)
+ gdbarch_register (bfd_arch_arm, arm_gdbarch_init, arm_dump_tdep);
+
+ /* Register an ELF OS ABI sniffer for ARM binaries. */
+ gdbarch_register_osabi_sniffer (bfd_arch_arm,
+ bfd_target_elf_flavour,
+ arm_elf_osabi_sniffer);
+
+ /* Register some ABI variants for embedded systems. */
+ gdbarch_register_osabi (bfd_arch_arm, GDB_OSABI_ARM_EABI_V1,
+ arm_init_abi_eabi_v1);
+ gdbarch_register_osabi (bfd_arch_arm, GDB_OSABI_ARM_EABI_V2,
+ arm_init_abi_eabi_v2);
+ gdbarch_register_osabi (bfd_arch_arm, GDB_OSABI_ARM_APCS,
+ arm_init_abi_apcs);
+
+ tm_print_insn = gdb_print_insn_arm;
+
+ /* Get the number of possible sets of register names defined in opcodes. */
+ num_flavor_options = get_arm_regname_num_options ();
+
+ /* Sync the opcode insn printer with our register viewer. */
+ parse_arm_disassembler_option ("reg-names-std");
+
+ /* Begin creating the help text. */
+ stb = mem_fileopen ();
+ fprintf_unfiltered (stb, "Set the disassembly flavor.\n\
+The valid values are:\n");
+
+ /* Initialize the array that will be passed to add_set_enum_cmd(). */
+ valid_flavors = xmalloc ((num_flavor_options + 1) * sizeof (char *));
+ for (i = 0; i < num_flavor_options; i++)
+ {
+ numregs = get_arm_regnames (i, &setname, &setdesc, ®names);
+ valid_flavors[i] = setname;
+ fprintf_unfiltered (stb, "%s - %s\n", setname,
+ setdesc);
+ /* Copy the default names (if found) and synchronize disassembler. */
+ if (!strcmp (setname, "std"))
+ {
+ disassembly_flavor = setname;
+ current_option = i;
+ for (j = 0; j < numregs; j++)
+ arm_register_names[j] = (char *) regnames[j];
+ set_arm_regname_option (i);
+ }
+ }
+ /* Mark the end of valid options. */
+ valid_flavors[num_flavor_options] = NULL;
+
+ /* Finish the creation of the help text. */
+ fprintf_unfiltered (stb, "The default is \"std\".");
+ helptext = ui_file_xstrdup (stb, &length);
+ ui_file_delete (stb);
+
+ /* Add the disassembly-flavor command. */
+ new_cmd = add_set_enum_cmd ("disassembly-flavor", no_class,
+ valid_flavors,
+ &disassembly_flavor,
+ helptext,
+ &setlist);
+ set_cmd_sfunc (new_cmd, set_disassembly_flavor_sfunc);
+ add_show_from_set (new_cmd, &showlist);
+
+ /* ??? Maybe this should be a boolean. */
add_show_from_set (add_set_cmd ("apcs32", no_class,
- var_integer, (char *)&arm_apcs_32,
+ var_zinteger, (char *) &arm_apcs_32,
"Set usage of ARM 32-bit mode.\n", &setlist),
&showlist);
+ /* Add the deprecated "othernames" command. */
+
+ add_com ("othernames", class_obscure, arm_othernames,
+ "Switch to the next set of register names.");
+
+ /* Fill in the prologue_cache fields. */
+ prologue_cache.saved_regs = NULL;
+ prologue_cache.extra_info = (struct frame_extra_info *)
+ xcalloc (1, sizeof (struct frame_extra_info));
+
+ /* Debugging flag. */
+ add_show_from_set (add_set_cmd ("arm", class_maintenance, var_zinteger,
+ &arm_debug, "Set arm debugging.\n\
+When non-zero, arm specific debugging is enabled.", &setdebuglist),
+ &showdebuglist);
}
projects / deliverable / binutils-gdb.git / blobdiff