-/* Work with core dump and executable files, for GDB on MIPS.
- This code would be in core.c if it weren't machine-dependent. */
-
-/* Low level interface to ptrace, for GDB when running under Unix.
- Copyright (C) 1988, 1989, 1990 Free Software Foundation, Inc.
+/* Target-dependent code for the MIPS architecture, for GDB, the GNU Debugger.
+ Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Contributed by Alessandro Forin(af@cs.cmu.edu) at CMU
and by Per Bothner(bothner@cs.wisc.edu) at U.Wisconsin.
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-/* FIXME: Can a MIPS porter/tester determine which of these include
- files we still need? -- gnu@cygnus.com */
-#include <stdio.h>
-#ifdef sgi
-#include <sys/inst.h>
-#else
-#include <mips/inst.h>
-#endif
#include "defs.h"
-#include "param.h"
#include "frame.h"
#include "inferior.h"
#include "symtab.h"
#include <signal.h>
#include <sys/ioctl.h>
+#ifdef sgi
+/* Must do it this way only for SGIs, as other mips platforms get their
+ JB_ symbols from machine/pcb.h (included via sys/user.h). */
+#include <setjmp.h>
+#endif
+
#include "gdbcore.h"
+#include "symfile.h"
+#include "objfiles.h"
#ifndef MIPSMAGIC
#ifdef MIPSEL
#include <sys/stat.h>
\f
-#define PROC_LOW_ADDR(proc) ((proc)->adr) /* least address */
-#define PROC_HIGH_ADDR(proc) ((proc)->pad2) /* upper address bound */
-#define PROC_FRAME_OFFSET(proc) ((proc)->framesize)
-#define PROC_FRAME_REG(proc) ((proc)->framereg)
-#define PROC_REG_MASK(proc) ((proc)->regmask)
-#define PROC_FREG_MASK(proc) ((proc)->fregmask)
-#define PROC_REG_OFFSET(proc) ((proc)->regoffset)
-#define PROC_FREG_OFFSET(proc) ((proc)->fregoffset)
-#define PROC_PC_REG(proc) ((proc)->pcreg)
-#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->isym)
+#define PROC_LOW_ADDR(proc) ((proc)->pdr.adr) /* least address */
+#define PROC_HIGH_ADDR(proc) ((proc)->pdr.iline) /* upper address bound */
+#define PROC_FRAME_OFFSET(proc) ((proc)->pdr.frameoffset)
+#define PROC_FRAME_REG(proc) ((proc)->pdr.framereg)
+#define PROC_REG_MASK(proc) ((proc)->pdr.regmask)
+#define PROC_FREG_MASK(proc) ((proc)->pdr.fregmask)
+#define PROC_REG_OFFSET(proc) ((proc)->pdr.regoffset)
+#define PROC_FREG_OFFSET(proc) ((proc)->pdr.fregoffset)
+#define PROC_PC_REG(proc) ((proc)->pdr.pcreg)
+#define PROC_SYMBOL(proc) (*(struct symbol**)&(proc)->pdr.isym)
#define _PROC_MAGIC_ 0x0F0F0F0F
-#define PROC_DESC_IS_DUMMY(proc) ((proc)->isym == _PROC_MAGIC_)
-#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->isym = _PROC_MAGIC_)
+#define PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym == _PROC_MAGIC_)
+#define SET_PROC_DESC_IS_DUMMY(proc) ((proc)->pdr.isym = _PROC_MAGIC_)
struct linked_proc_info
{
\f
#define READ_FRAME_REG(fi, regno) read_next_frame_reg((fi)->next, regno)
-int
+static int
read_next_frame_reg(fi, regno)
FRAME fi;
int regno;
mips_frame_saved_pc(frame)
FRAME frame;
{
- mips_extra_func_info_t proc_desc = (mips_extra_func_info_t)frame->proc_desc;
+ mips_extra_func_info_t proc_desc = frame->proc_desc;
int pcreg = proc_desc ? PROC_PC_REG(proc_desc) : RA_REGNUM;
+
if (proc_desc && PROC_DESC_IS_DUMMY(proc_desc))
return read_memory_integer(frame->frame - 4, 4);
-#if 0
- /* If in the procedure prologue, RA_REGNUM might not have been saved yet.
- * Assume non-leaf functions start with:
- * addiu $sp,$sp,-frame_size
- * sw $ra,ra_offset($sp)
- * This if the pc is pointing at either of these instructions,
- * then $ra hasn't been trashed.
- * If the pc has advanced beyond these two instructions,
- * then $ra has been saved.
- * critical, and much more complex. Handling $ra is enough to get
- * a stack trace, but some register values with be wrong.
- */
- if (frame->proc_desc && frame->pc < PROC_LOW_ADDR(proc_desc) + 8)
- return read_register(pcreg);
-#endif
+
return read_next_frame_reg(frame, pcreg);
}
static struct mips_extra_func_info temp_proc_desc;
static struct frame_saved_regs temp_saved_regs;
-CORE_ADDR heuristic_proc_start(pc)
+static CORE_ADDR
+heuristic_proc_start(pc)
CORE_ADDR pc;
{
-
CORE_ADDR start_pc = pc;
- CORE_ADDR fence = start_pc - 10000;
+ CORE_ADDR fence = start_pc - 200;
+
+ if (start_pc == 0) return 0;
if (fence < VM_MIN_ADDRESS) fence = VM_MIN_ADDRESS;
+
/* search back for previous return */
for (start_pc -= 4; ; start_pc -= 4)
if (start_pc < fence) return 0;
return start_pc;
}
-mips_extra_func_info_t
+static mips_extra_func_info_t
heuristic_proc_desc(start_pc, limit_pc, next_frame)
CORE_ADDR start_pc, limit_pc;
FRAME next_frame;
status = read_memory_nobpt (cur_pc, &word, 4);
if (status) memory_error (status, cur_pc);
+ SWAP_TARGET_AND_HOST (&word, sizeof (word));
if ((word & 0xFFFF0000) == 0x27bd0000) /* addiu $sp,$sp,-i */
frame_size += (-word) & 0xFFFF;
else if ((word & 0xFFFF0000) == 0x23bd0000) /* addu $sp,$sp,-i */
return &temp_proc_desc;
}
-mips_extra_func_info_t
+static mips_extra_func_info_t
find_proc_desc(pc, next_frame)
CORE_ADDR pc;
FRAME next_frame;
{
mips_extra_func_info_t proc_desc;
- extern struct block *block_for_pc();
- struct block *b = block_for_pc(pc);
-
+ struct block *b = block_for_pc(pc);
struct symbol *sym =
b ? lookup_symbol(".gdbinfo.", b, LABEL_NAMESPACE, 0, NULL) : NULL;
- if (sym != NULL)
+
+ if (sym)
{
/* IF this is the topmost frame AND
* (this proc does not have debugging information OR
* the PC is in the procedure prologue)
- * THEN create a "hueristic" proc_desc (by analyzing
+ * THEN create a "heuristic" proc_desc (by analyzing
* the actual code) to replace the "official" proc_desc.
*/
- proc_desc = (struct mips_extra_func_info *)sym->value.value;
+ proc_desc = (mips_extra_func_info_t)SYMBOL_VALUE(sym);
if (next_frame == NULL) {
struct symtab_and_line val;
struct symbol *proc_symbol =
PROC_DESC_IS_DUMMY(proc_desc) ? 0 : PROC_SYMBOL(proc_desc);
+
if (proc_symbol) {
val = find_pc_line (BLOCK_START
(SYMBOL_BLOCK_VALUE(proc_symbol)),
}
else
{
+ /* Is linked_proc_desc_table really necessary? It only seems to be used
+ by procedure call dummys. However, the procedures being called ought
+ to have their own proc_descs, and even if they don't,
+ heuristic_proc_desc knows how to create them! */
+
register struct linked_proc_info *link;
for (link = linked_proc_desc_table; link; link = link->next)
if (PROC_LOW_ADDR(&link->info) <= pc
mips_extra_func_info_t cached_proc_desc;
-FRAME_ADDR mips_frame_chain(frame)
+FRAME_ADDR
+mips_frame_chain(frame)
FRAME frame;
{
- extern CORE_ADDR startup_file_start; /* From blockframe.c */
mips_extra_func_info_t proc_desc;
CORE_ADDR saved_pc = FRAME_SAVED_PC(frame);
- if (startup_file_start)
- { /* has at least the __start symbol */
- if (saved_pc == 0 || !outside_startup_file (saved_pc)) return 0;
- }
- else
- { /* This hack depends on the internals of __start. */
- /* We also assume the breakpoints are *not* inserted */
- if (saved_pc == 0
- || read_memory_integer (saved_pc + 8, 4) & 0xFC00003F == 0xD)
- return 0; /* break */
- }
+
+ if (saved_pc == 0 || inside_entry_file (saved_pc))
+ return 0;
+
proc_desc = find_proc_desc(saved_pc, frame);
- if (!proc_desc) return 0;
+ if (!proc_desc)
+ return 0;
+
cached_proc_desc = proc_desc;
return read_next_frame_reg(frame, PROC_FRAME_REG(proc_desc))
- + PROC_FRAME_OFFSET(proc_desc);
+ + PROC_FRAME_OFFSET(proc_desc);
}
void
/* Use proc_desc calculated in frame_chain */
mips_extra_func_info_t proc_desc = fci->next ? cached_proc_desc :
find_proc_desc(fci->pc, fci->next);
+
fci->saved_regs = (struct frame_saved_regs*)
obstack_alloc (&frame_cache_obstack, sizeof(struct frame_saved_regs));
bzero(fci->saved_regs, sizeof(struct frame_saved_regs));
fci->proc_desc =
- proc_desc == &temp_proc_desc ? (char*)NULL : (char*)proc_desc;
+ proc_desc == &temp_proc_desc ? 0 : proc_desc;
if (proc_desc)
{
int ireg;
for (ireg = 31; mask; --ireg, mask <<= 1)
if (mask & 0x80000000)
{
- fci->saved_regs->regs[32+ireg] = reg_position;
+ fci->saved_regs->regs[FP0_REGNUM+ireg] = reg_position;
reg_position -= 4;
}
}
fci->saved_regs->regs[PC_REGNUM] = fci->saved_regs->regs[RA_REGNUM];
}
- if (fci->next == 0)
- supply_register(FP_REGNUM, &fci->frame);
}
-CORE_ADDR mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
+CORE_ADDR
+mips_push_arguments(nargs, args, sp, struct_return, struct_addr)
int nargs;
value *args;
CORE_ADDR sp;
for (ireg = 32; --ireg >= 0; )
if (PROC_FREG_MASK(proc_desc) & (1 << ireg))
{
- buffer = read_register (ireg);
+ buffer = read_register (ireg + FP0_REGNUM);
write_memory (save_address, &buffer, 4);
save_address -= 4;
}
if (PROC_REG_MASK(proc_desc) & (1 << regnum))
write_register (regnum,
read_memory_integer (frame->saved_regs->regs[regnum], 4));
- for (regnum = 64; --regnum >= 32; )
+ for (regnum = 32; --regnum >= 0; )
if (PROC_FREG_MASK(proc_desc) & (1 << regnum))
- write_register (regnum,
- read_memory_integer (frame->saved_regs->regs[regnum], 4));
+ write_register (regnum + FP0_REGNUM,
+ read_memory_integer (frame->saved_regs->regs[regnum + FP0_REGNUM], 4));
}
write_register (SP_REGNUM, new_sp);
flush_cached_frames ();
set_current_frame (create_new_frame (new_sp, read_pc ()));
}
-static
+static void
mips_print_register(regnum, all)
int regnum, all;
{
- unsigned char raw_buffer[8];
+ unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE];
REGISTER_TYPE val;
- read_relative_register_raw_bytes (regnum, raw_buffer);
-
- if (!(regnum & 1) && regnum >= FP0_REGNUM && regnum < FP0_REGNUM+32) {
+ /* Get the data in raw format. */
+ if (read_relative_register_raw_bytes (regnum, raw_buffer))
+ {
+ printf_filtered ("%s: [Invalid]", reg_names[regnum]);
+ return;
+ }
+
+ /* If an even floating pointer register, also print as double. */
+ if (regnum >= FP0_REGNUM && regnum < FP0_REGNUM+32
+ && !((regnum-FP0_REGNUM) & 1)) {
read_relative_register_raw_bytes (regnum+1, raw_buffer+4);
- printf_filtered ("(d%d: ", regnum&31);
+ printf_filtered ("(d%d: ", regnum-FP0_REGNUM);
val_print (builtin_type_double, raw_buffer, 0,
stdout, 0, 1, 0, Val_pretty_default);
- printf_filtered ("); ", regnum&31);
+ printf_filtered ("); ");
}
fputs_filtered (reg_names[regnum], stdout);
#ifndef NUMERIC_REG_NAMES
long val;
bcopy (raw_buffer, &val, sizeof (long));
+ SWAP_TARGET_AND_HOST ((char *)&val, sizeof (long));
if (val == 0)
printf_filtered ("0");
else if (all)
}
/* Replacement for generic do_registers_info. */
+void
mips_do_registers_info (regnum, fpregs)
int regnum;
int fpregs;
/* Return number of args passed to a frame. described by FIP.
Can return -1, meaning no way to tell. */
+int
mips_frame_num_args(fip)
FRAME fip;
{
}
else return 1;
}
+\f
+/*
+ * Implemented for Irix 4.x by Garrett A. Wollman
+ */
+#ifdef USE_PROC_FS /* Target-dependent /proc support */
+
+#include <sys/time.h>
+#include <sys/procfs.h>
+
+typedef unsigned int greg_t; /* why isn't this defined? */
+
+/*
+ * See the comment in m68k-tdep.c regarding the utility of these functions.
+ */
+
+void
+supply_gregset (gregsetp)
+ gregset_t *gregsetp;
+{
+ register int regno;
+ register greg_t *regp = (greg_t *)(gregsetp->gp_regs);
+
+ /* FIXME: somewhere, there should be a #define for the meaning
+ of this magic number 32; we should use that. */
+ for(regno = 0; regno < 32; regno++)
+ supply_register (regno, (char *)(regp + regno));
+
+ supply_register (PC_REGNUM, (char *)&(gregsetp->gp_pc));
+ supply_register (HI_REGNUM, (char *)&(gregsetp->gp_mdhi));
+ supply_register (LO_REGNUM, (char *)&(gregsetp->gp_mdlo));
+ supply_register (PS_REGNUM, (char *)&(gregsetp->gp_cause));
+}
+void
+fill_gregset (gregsetp, regno)
+ gregset_t *gregsetp;
+ int regno;
+{
+ int regi;
+ register greg_t *regp = (greg_t *)(gregsetp->gp_regs);
+ extern char registers[];
+
+ /* same FIXME as above wrt 32*/
+ for (regi = 0; regi < 32; regi++)
+ if ((regno == -1) || (regno == regi))
+ *(regp + regno) = *(greg_t *) ®isters[REGISTER_BYTE (regi)];
+
+ if ((regno == -1) || (regno == PC_REGNUM))
+ gregsetp->gp_pc = *(greg_t *) ®isters[REGISTER_BYTE (PC_REGNUM)];
+
+ if ((regno == -1) || (regno == PS_REGNUM))
+ gregsetp->gp_cause = *(greg_t *) ®isters[REGISTER_BYTE (PS_REGNUM)];
+
+ if ((regno == -1) || (regno == HI_REGNUM))
+ gregsetp->gp_mdhi = *(greg_t *) ®isters[REGISTER_BYTE (HI_REGNUM)];
+
+ if ((regno == -1) || (regno == LO_REGNUM))
+ gregsetp->gp_mdlo = *(greg_t *) ®isters[REGISTER_BYTE (LO_REGNUM)];
+}
+
+/*
+ * Now we do the same thing for floating-point registers.
+ * We don't bother to condition on FP0_REGNUM since any
+ * reasonable MIPS configuration has an R3010 in it.
+ *
+ * Again, see the comments in m68k-tdep.c.
+ */
+
+void
+supply_fpregset (fpregsetp)
+ fpregset_t *fpregsetp;
+{
+ register int regno;
+
+ for (regno = 0; regno < 32; regno++)
+ supply_register (FP0_REGNUM + regno,
+ (char *)&fpregsetp->fp_r.fp_regs[regno]);
+
+ supply_register (FCRCS_REGNUM, (char *)&fpregsetp->fp_csr);
+
+ /* FIXME: how can we supply FCRIR_REGNUM? SGI doesn't tell us. */
+}
+
+void
+fill_fpregset (fpregsetp, regno)
+ fpregset_t *fpregsetp;
+ int regno;
+{
+ int regi;
+ char *from, *to;
+ extern char registers[];
+
+ for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
+ {
+ if ((regno == -1) || (regno == regi))
+ {
+ from = (char *) ®isters[REGISTER_BYTE (regi)];
+ to = (char *) &(fpregsetp->fp_r.fp_regs[regi]);
+ bcopy(from, to, REGISTER_RAW_SIZE (regno));
+ }
+ }
+
+ if ((regno == -1) || (regno == FCRCS_REGNUM))
+ fpregsetp->fp_csr = *(unsigned *) ®isters[REGISTER_BYTE(FCRCS_REGNUM)];
+}
+
+#endif /* USE_PROC_FS */
+\f
/* To skip prologues, I use this predicate. Returns either PC
itself if the code at PC does not look like a function prologue,
PC+4 if it does (our caller does not need anything more fancy). */
-CORE_ADDR mips_skip_prologue(pc)
+CORE_ADDR
+mips_skip_prologue(pc)
CORE_ADDR pc;
{
struct symbol *f;
struct block *b;
unsigned long inst;
+ int offset;
/* For -g modules and most functions anyways the
- first instruction adjusts the stack. */
- inst = read_memory_integer(pc, 4);
- if ((inst & 0xffff0000) == 0x27bd0000)
- return pc + 4;
+ first instruction adjusts the stack.
+ But we allow some number of stores before the stack adjustment.
+ (These are emitted by varags functions compiled by gcc-2.0. */
+ for (offset = 0; offset < 100; offset += 4) {
+ inst = read_memory_integer(pc + offset, 4);
+ if ((inst & 0xffff0000) == 0x27bd0000) /* addiu $sp,$sp,offset */
+ return pc + offset + 4;
+ if ((inst & 0xFFE00000) != 0xAFA00000) /* sw reg,n($sp) */
+ break;
+ }
/* Well, it looks like a frameless. Let's make sure.
Note that we are not called on the current PC,
Actually, it would not hurt to skip the storing
of arguments on the stack as well. */
- if (((struct mips_extra_func_info *)f->value.value)->framesize)
+ if (((mips_extra_func_info_t)SYMBOL_VALUE(f))->pdr.frameoffset)
return pc + 4;
return pc;
}
+
+/* Figure out where the longjmp will land.
+ We expect the first arg to be a pointer to the jmp_buf structure from which
+ we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
+ This routine returns true on success. */
+
+int
+get_longjmp_target(pc)
+ CORE_ADDR *pc;
+{
+ CORE_ADDR jb_addr;
+
+ jb_addr = read_register(A0_REGNUM);
+
+ if (target_read_memory(jb_addr + JB_PC * JB_ELEMENT_SIZE, pc,
+ sizeof(CORE_ADDR)))
+ return 0;
+
+ SWAP_TARGET_AND_HOST(pc, sizeof(CORE_ADDR));
+
+ return 1;
+}
projects / deliverable / binutils-gdb.git / blobdiff