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gcc/gcc/ada/tracebak.c
Geoffrey Keating 6cbcc54138 Delete all lines containing "$Revision:". 
* xeinfo.adb: Don't look for revision numbers.
	* xnmake.adb: Likewise.
	* xsinfo.adb: Likewise.
	* xsnames.adb: Likewise.
	* xtreeprs.adb: Likewise.

From-SVN: r50768
2002-03-14 11:00:22 +00:00

1210 lines
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/****************************************************************************
* *
* GNAT COMPILER COMPONENTS *
* *
* T R A C E B A C K *
* *
* C Implementation File *
* *
* *
* Copyright (C) 2000-2001 Ada Core Technologies, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 2, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT 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 distributed with GNAT; see file COPYING. If not, write *
* to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
* MA 02111-1307, USA. *
* *
* As a special exception, if you link this file with other files to *
* produce an executable, this file does not by itself cause the resulting *
* executable to be covered by the GNU General Public License. This except- *
* ion does not however invalidate any other reasons why the executable *
* file might be covered by the GNU Public License. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). *
* *
****************************************************************************/
/* This file contains low level support for stack unwinding using GCC intrinsic
functions.
It has been tested on the following configurations:
HPPA/HP-UX
PowerPC/AiX
PowerPC/VxWorks
Sparc/Solaris
i386/GNU/Linux
i386/Solaris
i386/NT
i386/OS2
i386/LynxOS
Alpha/VxWorks
*/
#ifdef __alpha_vxworks
#include "vxWorks.h"
#endif
#ifdef IN_RTS
#define POSIX
#include "tconfig.h"
#include "tsystem.h"
#else
#include "config.h"
#include "system.h"
#endif
#define Lock_Task system__soft_links__lock_task
extern void (*Lock_Task) PARAMS ((void));
#define Unlock_Task system__soft_links__unlock_task
extern void (*Unlock_Task) PARAMS ((void));
#ifndef CURRENT_STACK_FRAME
# define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
#endif
extern int __gnat_backtrace PARAMS ((void **, int, void *, void *));
#if defined (__hppa)
struct layout
{
void *return_address;
void *pad[4];
struct layout *next;
};
#define FRAME_LEVEL 1
#define FRAME_OFFSET -20
#define SKIP_FRAME 1
#define PC_ADJUST -4
/* If CURRENT is unaligned, it means that CURRENT is not a valid frame
pointer and we should stop popping frames. */
#define STOP_FRAME(CURRENT, TOP_STACK) \
(((int) (CURRENT) & 0x3) != 0 && (CURRENT)->return_address == 0)
/* Current implementation need to be protected against invalid memory
accesses */
#define PROTECT_SEGV
#elif defined (_AIX)
struct layout
{
struct layout *next;
void *pad;
void *return_address;
};
#define FRAME_LEVEL 1
#define FRAME_OFFSET 0
#define SKIP_FRAME 2
#define PC_ADJUST -4
#define STOP_FRAME(CURRENT, TOP_STACK) ((void *) (CURRENT) < (TOP_STACK))
#elif defined (_ARCH_PPC) && defined (__vxworks)
struct layout
{
struct layout *next;
void *return_address;
};
#define FRAME_LEVEL 1
#define FRAME_OFFSET 0
#define SKIP_FRAME 2
#define PC_ADJUST 0
#define STOP_FRAME(CURRENT, TOP_STACK) ((CURRENT)->return_address == 0)
#elif defined (sun) && defined (sparc)
struct layout
{
struct layout *next;
void *return_address;
};
#define FRAME_LEVEL 1
#define FRAME_OFFSET (14*4)
#define SKIP_FRAME 1
#define PC_ADJUST 0
#define STOP_FRAME(CURRENT, TOP_STACK) \
((CURRENT)->return_address == 0|| (CURRENT)->next == 0 \
|| (void *) (CURRENT) < (TOP_STACK))
#elif defined (i386)
struct layout
{
struct layout *next;
void *return_address;
};
#ifdef _WIN32
/* _image_base__ is the image starting address, no stack addresses should be
under this value */
extern unsigned int _image_base__;
#define LOWEST_ADDR ((unsigned int) (&_image_base__))
#else
#define LOWEST_ADDR 0
#endif
#define FRAME_LEVEL 0
#define FRAME_OFFSET 0
#define SKIP_FRAME 1
#define PC_ADJUST -2
#define STOP_FRAME(CURRENT, TOP_STACK) \
((unsigned int)(CURRENT)->return_address < LOWEST_ADDR \
|| (CURRENT)->return_address == 0|| (CURRENT)->next == 0 \
|| (void *) (CURRENT) < (TOP_STACK))
/* On i386 architecture we check that at the call point we really have a call
insn. Possible call instructions are:
call addr16 E8 xx xx xx xx
call reg FF Dx
call off(reg) FF xx xx
lcall addr seg 9A xx xx xx xx xx xx
This check will not catch all cases but it will increase the backtrace
reliability on this architecture.
*/
#define VALID_STACK_FRAME(ptr) \
(((*((ptr) - 3) & 0xff) == 0xe8) \
|| ((*((ptr) - 4) & 0xff) == 0x9a) \
|| ((*((ptr) - 2) & 0xff) == 0xff) \
|| (((*((ptr) - 1) & 0xff00) == 0xff00) \
&& ((*((ptr) - 1) & 0xf0) == 0xd0)))
#elif defined (__alpha_vxworks)
#define SKIP_FRAME 1
#define PC_ADJUST -4
extern void kerTaskEntry();
#define STOP_FRAME \
(current == NULL \
|| ((CORE_ADDR) &kerTaskEntry >= PROC_LOW_ADDR (current->proc_desc) \
&& current->pc >= (CORE_ADDR) &kerTaskEntry))
#endif
#if !defined (PC_ADJUST)
int
__gnat_backtrace (array, size, exclude_min, exclude_max)
void **array ATTRIBUTE_UNUSED;
int size ATTRIBUTE_UNUSED;
void *exclude_min ATTRIBUTE_UNUSED;
void *exclude_max ATTRIBUTE_UNUSED;
{
return 0;
}
#elif !defined (__alpha_vxworks)
#ifdef PROTECT_SEGV
#include <setjmp.h>
#include <signal.h>
static jmp_buf sigsegv_excp;
static void
segv_handler (ignored)
int ignored;
{
longjmp (sigsegv_excp, 1);
}
#endif
#ifndef VALID_STACK_FRAME
#define VALID_STACK_FRAME(ptr) 1
#endif
int
__gnat_backtrace (array, size, exclude_min, exclude_max)
void **array;
int size;
void *exclude_min;
void *exclude_max;
{
struct layout *current;
void *top_frame;
void *top_stack;
int cnt = 0;
#ifdef PROTECT_SEGV
struct sigaction this_act, old_act;
/* This function is not thread safe if PROTECT_SEGV is defined, so
protect it */
(*Lock_Task) ();
#endif
top_frame = __builtin_frame_address (FRAME_LEVEL);
top_stack = CURRENT_STACK_FRAME;
current = (struct layout *) ((size_t) top_frame + FRAME_OFFSET);
#ifdef PROTECT_SEGV
this_act.sa_handler = segv_handler;
sigemptyset (&this_act.sa_mask);
this_act.sa_flags = 0;
sigaction (SIGSEGV, &this_act, &old_act);
if (setjmp (sigsegv_excp))
goto Done;
#endif
/* We skip the call to this function, it makes no sense to record it. */
while (cnt < SKIP_FRAME)
{
current = (struct layout *) ((size_t) current->next + FRAME_OFFSET);
cnt++;
}
cnt = 0;
while (cnt < size)
{
if (STOP_FRAME (current, top_stack) ||
!VALID_STACK_FRAME((char *)(current->return_address + PC_ADJUST)))
break;
if (current->return_address < exclude_min
|| current->return_address > exclude_max)
array[cnt++] = current->return_address + PC_ADJUST;
current = (struct layout *) ((size_t) current->next + FRAME_OFFSET);
}
#ifdef PROTECT_SEGV
Done:
sigaction (SIGSEGV, &old_act, NULL);
(*Unlock_Task) ();
#endif
return cnt;
}
#else
/* Alpha vxWorks requires a special, complex treatment that is extracted
from GDB */
#include <string.h>
/* Register numbers of various important registers.
Note that most of these values are "real" register numbers,
and correspond to the general registers of the machine,
and FP_REGNUM is a "phony" register number which is too large
to be an actual register number as far as the user is concerned
but serves to get the desired value when passed to read_register. */
#define T7_REGNUM 8 /* Return address register for OSF/1 __add* */
#define GCC_FP_REGNUM 15 /* Used by gcc as frame register */
#define T9_REGNUM 23 /* Return address register for OSF/1 __div* */
#define SP_REGNUM 30 /* Contains address of top of stack */
#define RA_REGNUM 26 /* Contains return address value */
#define FP0_REGNUM 32 /* Floating point register 0 */
#define PC_REGNUM 64 /* Contains program counter */
#define NUM_REGS 66
#define VM_MIN_ADDRESS (CORE_ADDR)0x120000000
#define SIZEOF_FRAME_SAVED_REGS (sizeof (CORE_ADDR) * (NUM_REGS))
#define INIT_EXTRA_FRAME_INFO(fromleaf, fci) init_extra_frame_info(fci)
#define FRAME_CHAIN(thisframe) (CORE_ADDR) alpha_frame_chain (thisframe)
#define FRAME_CHAIN_VALID(CHAIN, THISFRAME) \
((CHAIN) != 0 \
&& !inside_entry_file (FRAME_SAVED_PC (THISFRAME)))
#define FRAME_SAVED_PC(FRAME) (alpha_frame_saved_pc (FRAME))
#define FRAME_CHAIN_COMBINE(CHAIN, THISFRAME) (CHAIN)
#define INIT_FRAME_PC(FROMLEAF, PREV)
#define INIT_FRAME_PC_FIRST(FROMLEAF, PREV) \
(PREV)->pc = ((FROMLEAF) ? SAVED_PC_AFTER_CALL ((PREV)->next) \
: (PREV)->next ? FRAME_SAVED_PC ((prev)->NEXT) : read_pc ());
#define SAVED_PC_AFTER_CALL(FRAME) alpha_saved_pc_after_call (FRAME)
typedef unsigned long long int bfd_vma;
typedef bfd_vma CORE_ADDR;
typedef struct pdr
{
bfd_vma adr; /* memory address of start of procedure */
long isym; /* start of local symbol entries */
long iline; /* start of line number entries*/
long regmask; /* save register mask */
long regoffset; /* save register offset */
long iopt; /* start of optimization symbol entries*/
long fregmask; /* save floating point register mask */
long fregoffset; /* save floating point register offset */
long frameoffset; /* frame size */
short framereg; /* frame pointer register */
short pcreg; /* offset or reg of return pc */
long lnLow; /* lowest line in the procedure */
long lnHigh; /* highest line in the procedure */
bfd_vma cbLineOffset; /* byte offset for this procedure from the fd base */
/* These fields are new for 64 bit ECOFF. */
unsigned gp_prologue : 8; /* byte size of GP prologue */
unsigned gp_used : 1; /* true if the procedure uses GP */
unsigned reg_frame : 1; /* true if register frame procedure */
unsigned prof : 1; /* true if compiled with -pg */
unsigned reserved : 13; /* reserved: must be zero */
unsigned localoff : 8; /* offset of local variables from vfp */
} PDR;
typedef struct alpha_extra_func_info
{
long numargs; /* number of args to procedure (was iopt) */
PDR pdr; /* Procedure descriptor record */
}
*alpha_extra_func_info_t;
struct frame_info
{
/* Nominal address of the frame described. See comments at FRAME_FP
about what this means outside the *FRAME* macros; in the *FRAME*
macros, it can mean whatever makes most sense for this machine. */
CORE_ADDR frame;
/* Address at which execution is occurring in this frame. For the
innermost frame, it's the current pc. For other frames, it is a
pc saved in the next frame. */
CORE_ADDR pc;
/* For each register, address of where it was saved on entry to the
frame, or zero if it was not saved on entry to this frame. This
includes special registers such as pc and fp saved in special
ways in the stack frame. The SP_REGNUM is even more special, the
address here is the sp for the next frame, not the address where
the sp was saved. Allocated by frame_saved_regs_zalloc () which
is called and initialized by FRAME_INIT_SAVED_REGS. */
CORE_ADDR *saved_regs; /*NUM_REGS */
int localoff;
int pc_reg;
alpha_extra_func_info_t proc_desc;
/* Pointers to the next and previous frame_info's in the frame cache. */
struct frame_info *next, *prev;
};
struct frame_saved_regs
{
/* For each register R (except the SP), regs[R] is the address at
which it was saved on entry to the frame, or zero if it was not
saved on entry to this frame. This includes special registers
such as pc and fp saved in special ways in the stack frame.
regs[SP_REGNUM] is different. It holds the actual SP, not the
address at which it was saved. */
CORE_ADDR regs[NUM_REGS];
};
static CORE_ADDR theRegisters[32];
/* Prototypes for local functions. */
static CORE_ADDR read_next_frame_reg PARAMS ((struct frame_info *, int));
static CORE_ADDR heuristic_proc_start PARAMS ((CORE_ADDR));
static int alpha_about_to_return PARAMS ((CORE_ADDR pc));
static void init_extra_frame_info PARAMS ((struct frame_info *));
static CORE_ADDR alpha_frame_chain PARAMS ((struct frame_info *));
static CORE_ADDR alpha_frame_saved_pc PARAMS ((struct frame_info *frame))
static void *trace_alloc PARAMS ((unsigned int));
static struct frame_info *create_new_frame PARAMS ((CORE_ADDR, CORE_ADDR));
static alpha_extra_func_info_t
heuristic_proc_desc PARAMS ((CORE_ADDR, CORE_ADDR, struct frame_info *,
struct frame_saved_regs *));
static alpha_extra_func_info_t
find_proc_desc PARAMS ((CORE_ADDR, struct frame_info *,
struct frame_saved_regs *));
/* Heuristic_proc_start may hunt through the text section for a long
time across a 2400 baud serial line. Allows the user to limit this
search. */
static unsigned int heuristic_fence_post = 1<<16;
/* Layout of a stack frame on the alpha:
| |
pdr members: | 7th ... nth arg, |
| `pushed' by caller. |
| |
----------------|-------------------------------|<-- old_sp == vfp
^ ^ ^ ^ | |
| | | | | |
| |localoff | Copies of 1st .. 6th |
| | | | | argument if necessary. |
| | | v | |
| | | --- |-------------------------------|<-- FRAME_LOCALS_ADDRESS
| | | | |
| | | | Locals and temporaries. |
| | | | |
| | | |-------------------------------|
| | | | |
|-fregoffset | Saved float registers. |
| | | | F9 |
| | | | . |
| | | | . |
| | | | F2 |
| | v | |
| | -------|-------------------------------|
| | | |
| | | Saved registers. |
| | | S6 |
|-regoffset | . |
| | | . |
| | | S0 |
| | | pdr.pcreg |
| v | |
| ----------|-------------------------------|
| | |
frameoffset | Argument build area, gets |
| | 7th ... nth arg for any |
| | called procedure. |
v | |
-------------|-------------------------------|<-- sp
| | */
#define PROC_LOW_ADDR(PROC) ((PROC)->pdr.adr) /* least address */
#define PROC_HIGH_ADDR(PROC) ((PROC)->pdr.iline) /* upper address bound */
#define PROC_DUMMY_FRAME(PROC) ((PROC)->pdr.cbLineOffset) /*CALL_DUMMY frame */
#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_LOCALOFF(PROC) ((PROC)->pdr.localoff)
/* Local storage allocation/deallocation functions. trace_alloc does
a malloc, but also chains allocated blocks on trace_alloc_chain, so
they may all be freed on exit from __gnat_backtrace. */
struct alloc_chain
{
struct alloc_chain *next;
double x[0];
};
struct alloc_chain *trace_alloc_chain;
static void *
trace_alloc (n)
unsigned int n;
{
struct alloc_chain * result = malloc (n + sizeof(struct alloc_chain));
result->next = trace_alloc_chain;
trace_alloc_chain = result;
return (void*) result->x;
}
static void
free_trace_alloc ()
{
while (trace_alloc_chain != 0)
{
struct alloc_chain *old = trace_alloc_chain;
trace_alloc_chain = trace_alloc_chain->next;
free (old);
}
}
/* Read value at ADDR into *DEST, returning 0 if this is valid, != 0
otherwise. */
static int
read_memory_safe4 (addr, dest)
CORE_ADDR addr;
unsigned int *dest;
{
*dest = *((unsigned int*) addr);
return 0;
}
/* Read value at ADDR into *DEST, returning 0 if this is valid, != 0
otherwise. */
static int
read_memory_safe8 (addr, dest)
CORE_ADDR addr;
CORE_ADDR *dest;
{
*dest = *((CORE_ADDR*) addr);
return 0;
}
static CORE_ADDR
read_register (regno)
int regno;
{
if (regno >= 0 && regno < 31)
return theRegisters[regno];
return (CORE_ADDR) 0;
}
static void
frame_saved_regs_zalloc (fi)
struct frame_info *fi;
{
fi->saved_regs = (CORE_ADDR *) trace_alloc (SIZEOF_FRAME_SAVED_REGS);
memset (fi->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS);
}
static void *
frame_obstack_alloc (size)
unsigned long size;
{
return (void *) trace_alloc (size);
}
static int
inside_entry_file (addr)
CORE_ADDR addr;
{
if (addr == 0)
return 1;
else
return 0;
}
static CORE_ADDR
alpha_saved_pc_after_call (frame)
struct frame_info *frame;
{
CORE_ADDR pc = frame->pc;
alpha_extra_func_info_t proc_desc;
int pcreg;
proc_desc = find_proc_desc (pc, frame->next, NULL);
pcreg = proc_desc ? PROC_PC_REG (proc_desc) : RA_REGNUM;
return read_register (pcreg);
}
/* Guaranteed to set frame->saved_regs to some values (it never leaves it
NULL). */
static void
alpha_find_saved_regs (frame)
struct frame_info *frame;
{
int ireg;
CORE_ADDR reg_position;
unsigned long mask;
alpha_extra_func_info_t proc_desc;
int returnreg;
frame_saved_regs_zalloc (frame);
/* If it is the frame for __sigtramp, the saved registers are located in a
sigcontext structure somewhere on the stack. __sigtramp passes a pointer
to the sigcontext structure on the stack. If the stack layout for
__sigtramp changes, or if sigcontext offsets change, we might have to
update this code. */
#ifndef SIGFRAME_PC_OFF
#define SIGFRAME_PC_OFF (2 * 8)
#define SIGFRAME_REGSAVE_OFF (4 * 8)
#define SIGFRAME_FPREGSAVE_OFF (SIGFRAME_REGSAVE_OFF + 32 * 8 + 8)
#endif
proc_desc = frame->proc_desc;
if (proc_desc == NULL)
/* I'm not sure how/whether this can happen. Normally when we can't
find a proc_desc, we "synthesize" one using heuristic_proc_desc
and set the saved_regs right away. */
return;
/* Fill in the offsets for the registers which gen_mask says
were saved. */
reg_position = frame->frame + PROC_REG_OFFSET (proc_desc);
mask = PROC_REG_MASK (proc_desc);
returnreg = PROC_PC_REG (proc_desc);
/* Note that RA is always saved first, regardless of its actual
register number. */
if (mask & (1 << returnreg))
{
frame->saved_regs[returnreg] = reg_position;
reg_position += 8;
mask &= ~(1 << returnreg); /* Clear bit for RA so we
don't save again later. */
}
for (ireg = 0; ireg <= 31; ireg++)
if (mask & (1 << ireg))
{
frame->saved_regs[ireg] = reg_position;
reg_position += 8;
}
/* Fill in the offsets for the registers which float_mask says
were saved. */
reg_position = frame->frame + PROC_FREG_OFFSET (proc_desc);
mask = PROC_FREG_MASK (proc_desc);
for (ireg = 0; ireg <= 31; ireg++)
if (mask & (1 << ireg))
{
frame->saved_regs[FP0_REGNUM + ireg] = reg_position;
reg_position += 8;
}
frame->saved_regs[PC_REGNUM] = frame->saved_regs[returnreg];
}
static CORE_ADDR
read_next_frame_reg (fi, regno)
struct frame_info *fi;
int regno;
{
CORE_ADDR result;
for (; fi; fi = fi->next)
{
/* We have to get the saved sp from the sigcontext
if it is a signal handler frame. */
if (regno == SP_REGNUM)
return fi->frame;
else
{
if (fi->saved_regs == 0)
alpha_find_saved_regs (fi);
if (fi->saved_regs[regno])
{
if (read_memory_safe8 (fi->saved_regs[regno], &result) == 0)
return result;
else
return 0;
}
}
}
return read_register (regno);
}
static CORE_ADDR
alpha_frame_saved_pc (frame)
struct frame_info *frame;
{
return read_next_frame_reg (frame, frame->pc_reg);
}
static struct alpha_extra_func_info temp_proc_desc;
/* Nonzero if instruction at PC is a return instruction. "ret
$zero,($ra),1" on alpha. */
static int
alpha_about_to_return (pc)
CORE_ADDR pc;
{
int inst;
read_memory_safe4 (pc, &inst);
return inst == 0x6bfa8001;
}
/* A heuristically computed start address for the subprogram
containing address PC. Returns 0 if none detected. */
static CORE_ADDR
heuristic_proc_start (pc)
CORE_ADDR pc;
{
CORE_ADDR start_pc = pc;
CORE_ADDR fence = start_pc - heuristic_fence_post;
if (start_pc == 0)
return 0;
if (heuristic_fence_post == UINT_MAX
|| 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;
else if (alpha_about_to_return (start_pc))
break;
}
start_pc += 4; /* skip return */
return start_pc;
}
static alpha_extra_func_info_t
heuristic_proc_desc (start_pc, limit_pc, next_frame, saved_regs_p)
CORE_ADDR start_pc;
CORE_ADDR limit_pc;
struct frame_info *next_frame;
struct frame_saved_regs *saved_regs_p;
{
CORE_ADDR sp = read_next_frame_reg (next_frame, SP_REGNUM);
CORE_ADDR cur_pc;
int frame_size;
int has_frame_reg = 0;
unsigned long reg_mask = 0;
int pcreg = -1;
if (start_pc == 0)
return 0;
memset (&temp_proc_desc, '\0', sizeof (temp_proc_desc));
if (saved_regs_p != 0)
memset (saved_regs_p, '\0', sizeof (struct frame_saved_regs));
PROC_LOW_ADDR (&temp_proc_desc) = start_pc;
if (start_pc + 200 < limit_pc)
limit_pc = start_pc + 200;
frame_size = 0;
for (cur_pc = start_pc; cur_pc < limit_pc; cur_pc += 4)
{
unsigned int word;
int status;
status = read_memory_safe4 (cur_pc, &word);
if (status)
return 0;
if ((word & 0xffff0000) == 0x23de0000) /* lda $sp,n($sp) */
{
if (word & 0x8000)
frame_size += (-word) & 0xffff;
else
/* Exit loop if a positive stack adjustment is found, which
usually means that the stack cleanup code in the function
epilogue is reached. */
break;
}
else if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
&& (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
{
int reg = (word & 0x03e00000) >> 21;
reg_mask |= 1 << reg;
if (saved_regs_p != 0)
saved_regs_p->regs[reg] = sp + (short) word;
/* Starting with OSF/1-3.2C, the system libraries are shipped
without local symbols, but they still contain procedure
descriptors without a symbol reference. GDB is currently
unable to find these procedure descriptors and uses
heuristic_proc_desc instead.
As some low level compiler support routines (__div*, __add*)
use a non-standard return address register, we have to
add some heuristics to determine the return address register,
or stepping over these routines will fail.
Usually the return address register is the first register
saved on the stack, but assembler optimization might
rearrange the register saves.
So we recognize only a few registers (t7, t9, ra) within
the procedure prologue as valid return address registers.
If we encounter a return instruction, we extract the
the return address register from it.
FIXME: Rewriting GDB to access the procedure descriptors,
e.g. via the minimal symbol table, might obviate this hack. */
if (pcreg == -1
&& cur_pc < (start_pc + 80)
&& (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM))
pcreg = reg;
}
else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
pcreg = (word >> 16) & 0x1f;
else if (word == 0x47de040f) /* bis sp,sp fp */
has_frame_reg = 1;
}
if (pcreg == -1)
{
/* If we haven't found a valid return address register yet,
keep searching in the procedure prologue. */
while (cur_pc < (limit_pc + 80) && cur_pc < (start_pc + 80))
{
unsigned int word;
if (read_memory_safe4 (cur_pc, &word))
break;
cur_pc += 4;
if ((word & 0xfc1f0000) == 0xb41e0000 /* stq reg,n($sp) */
&& (word & 0xffff0000) != 0xb7fe0000) /* reg != $zero */
{
int reg = (word & 0x03e00000) >> 21;
if (reg == T7_REGNUM || reg == T9_REGNUM || reg == RA_REGNUM)
{
pcreg = reg;
break;
}
}
else if ((word & 0xffe0ffff) == 0x6be08001) /* ret zero,reg,1 */
{
pcreg = (word >> 16) & 0x1f;
break;
}
}
}
if (has_frame_reg)
PROC_FRAME_REG (&temp_proc_desc) = GCC_FP_REGNUM;
else
PROC_FRAME_REG (&temp_proc_desc) = SP_REGNUM;
PROC_FRAME_OFFSET (&temp_proc_desc) = frame_size;
PROC_REG_MASK (&temp_proc_desc) = reg_mask;
PROC_PC_REG (&temp_proc_desc) = (pcreg == -1) ? RA_REGNUM : pcreg;
PROC_LOCALOFF (&temp_proc_desc) = 0; /* XXX - bogus */
return &temp_proc_desc;
}
static alpha_extra_func_info_t
find_proc_desc (pc, next_frame, saved_regs)
CORE_ADDR pc;
struct frame_info *next_frame;
struct frame_saved_regs *saved_regs;
{
CORE_ADDR startaddr;
/* If heuristic_fence_post is non-zero, determine the procedure
start address by examining the instructions.
This allows us to find the start address of static functions which
have no symbolic information, as startaddr would have been set to
the preceding global function start address by the
find_pc_partial_function call above. */
startaddr = heuristic_proc_start (pc);
return heuristic_proc_desc (startaddr, pc, next_frame, saved_regs);
}
static CORE_ADDR
alpha_frame_chain (frame)
struct frame_info *frame;
{
alpha_extra_func_info_t proc_desc;
CORE_ADDR saved_pc = FRAME_SAVED_PC (frame);
if (saved_pc == 0 || inside_entry_file (saved_pc))
return 0;
proc_desc = find_proc_desc (saved_pc, frame, NULL);
if (!proc_desc)
return 0;
/* If no frame pointer and frame size is zero, we must be at end
of stack (or otherwise hosed). If we don't check frame size,
we loop forever if we see a zero size frame. */
if (PROC_FRAME_REG (proc_desc) == SP_REGNUM
&& PROC_FRAME_OFFSET (proc_desc) == 0)
return 0;
else
return read_next_frame_reg (frame, PROC_FRAME_REG (proc_desc))
+ PROC_FRAME_OFFSET (proc_desc);
}
static void
init_extra_frame_info (frame)
struct frame_info *frame;
{
struct frame_saved_regs temp_saved_regs;
alpha_extra_func_info_t proc_desc =
find_proc_desc (frame->pc, frame->next, &temp_saved_regs);
frame->saved_regs = NULL;
frame->localoff = 0;
frame->pc_reg = RA_REGNUM;
frame->proc_desc = proc_desc;
if (proc_desc)
{
/* Get the locals offset and the saved pc register from the
procedure descriptor, they are valid even if we are in the
middle of the prologue. */
frame->localoff = PROC_LOCALOFF (proc_desc);
frame->pc_reg = PROC_PC_REG (proc_desc);
/* Fixup frame-pointer - only needed for top frame */
/* This may not be quite right, if proc has a real frame register.
Get the value of the frame relative sp, procedure might have been
interrupted by a signal at it's very start. */
if (frame->pc == PROC_LOW_ADDR (proc_desc))
frame->frame = read_next_frame_reg (frame->next, SP_REGNUM);
else
frame->frame
= (read_next_frame_reg (frame->next, PROC_FRAME_REG (proc_desc))
+ PROC_FRAME_OFFSET (proc_desc));
frame->saved_regs
= (CORE_ADDR *) frame_obstack_alloc (SIZEOF_FRAME_SAVED_REGS);
memcpy
(frame->saved_regs, temp_saved_regs.regs, SIZEOF_FRAME_SAVED_REGS);
frame->saved_regs[PC_REGNUM] = frame->saved_regs[RA_REGNUM];
}
}
/* Create an arbitrary (i.e. address specified by user) or innermost frame.
Always returns a non-NULL value. */
static struct frame_info *
create_new_frame (addr, pc)
CORE_ADDR addr;
CORE_ADDR pc;
{
struct frame_info *fi;
fi = (struct frame_info *)
trace_alloc (sizeof (struct frame_info));
/* Arbitrary frame */
fi->next = NULL;
fi->prev = NULL;
fi->frame = addr;
fi->pc = pc;
#ifdef INIT_EXTRA_FRAME_INFO
INIT_EXTRA_FRAME_INFO (0, fi);
#endif
return fi;
}
static CORE_ADDR current_pc;
static void
set_current_pc ()
{
current_pc = (CORE_ADDR) __builtin_return_address (0);
}
static CORE_ADDR
read_pc ()
{
return current_pc;
}
static struct frame_info *
get_current_frame ()
{
return create_new_frame (0, read_pc ());
}
/* Return the frame that called FI.
If FI is the original frame (it has no caller), return 0. */
static struct frame_info *
get_prev_frame (next_frame)
struct frame_info *next_frame;
{
CORE_ADDR address = 0;
struct frame_info *prev;
int fromleaf = 0;
/* If we have the prev one, return it */
if (next_frame->prev)
return next_frame->prev;
/* On some machines it is possible to call a function without
setting up a stack frame for it. On these machines, we
define this macro to take two args; a frameinfo pointer
identifying a frame and a variable to set or clear if it is
or isn't leafless. */
/* Two macros defined in tm.h specify the machine-dependent
actions to be performed here.
First, get the frame's chain-pointer. If that is zero, the frame
is the outermost frame or a leaf called by the outermost frame.
This means that if start calls main without a frame, we'll return
0 (which is fine anyway).
Nope; there's a problem. This also returns when the current
routine is a leaf of main. This is unacceptable. We move
this to after the ffi test; I'd rather have backtraces from
start go curfluy than have an abort called from main not show
main. */
address = FRAME_CHAIN (next_frame);
if (!FRAME_CHAIN_VALID (address, next_frame))
return 0;
address = FRAME_CHAIN_COMBINE (address, next_frame);
if (address == 0)
return 0;
prev = (struct frame_info *) trace_alloc (sizeof (struct frame_info));
prev->saved_regs = NULL;
if (next_frame)
next_frame->prev = prev;
prev->next = next_frame;
prev->prev = (struct frame_info *) 0;
prev->frame = address;
/* This change should not be needed, FIXME! We should
determine whether any targets *need* INIT_FRAME_PC to happen
after INIT_EXTRA_FRAME_INFO and come up with a simple way to
express what goes on here.
INIT_EXTRA_FRAME_INFO is called from two places: create_new_frame
(where the PC is already set up) and here (where it isn't).
INIT_FRAME_PC is only called from here, always after
INIT_EXTRA_FRAME_INFO.
The catch is the MIPS, where INIT_EXTRA_FRAME_INFO requires the PC
value (which hasn't been set yet). Some other machines appear to
require INIT_EXTRA_FRAME_INFO before they can do INIT_FRAME_PC. Phoo.
We shouldn't need INIT_FRAME_PC_FIRST to add more complication to
an already overcomplicated part of GDB. gnu@cygnus.com, 15Sep92.
Assuming that some machines need INIT_FRAME_PC after
INIT_EXTRA_FRAME_INFO, one possible scheme:
SETUP_INNERMOST_FRAME()
Default version is just create_new_frame (read_fp ()),
read_pc ()). Machines with extra frame info would do that (or the
local equivalent) and then set the extra fields.
INIT_PREV_FRAME(fromleaf, prev)
Replace INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC. This should
also return a flag saying whether to keep the new frame, or
whether to discard it, because on some machines (e.g. mips) it
is really awkward to have FRAME_CHAIN_VALID called *before*
INIT_EXTRA_FRAME_INFO (there is no good way to get information
deduced in FRAME_CHAIN_VALID into the extra fields of the new frame).
std_frame_pc(fromleaf, prev)
This is the default setting for INIT_PREV_FRAME. It just does what
the default INIT_FRAME_PC does. Some machines will call it from
INIT_PREV_FRAME (either at the beginning, the end, or in the middle).
Some machines won't use it.
kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
#ifdef INIT_FRAME_PC_FIRST
INIT_FRAME_PC_FIRST (fromleaf, prev);
#endif
#ifdef INIT_EXTRA_FRAME_INFO
INIT_EXTRA_FRAME_INFO (fromleaf, prev);
#endif
/* This entry is in the frame queue now, which is good since
FRAME_SAVED_PC may use that queue to figure out its value
(see tm-sparc.h). We want the pc saved in the inferior frame. */
INIT_FRAME_PC (fromleaf, prev);
/* If ->frame and ->pc are unchanged, we are in the process of getting
ourselves into an infinite backtrace. Some architectures check this
in FRAME_CHAIN or thereabouts, but it seems like there is no reason
this can't be an architecture-independent check. */
if (next_frame != NULL)
{
if (prev->frame == next_frame->frame
&& prev->pc == next_frame->pc)
{
next_frame->prev = NULL;
free (prev);
return NULL;
}
}
return prev;
}
#define SAVE(regno,disp) \
"stq $" #regno ", " #disp "(%0)\n"
int
__gnat_backtrace (array, size, exclude_min, exclude_max)
void **array;
int size;
void *exclude_min;
void *exclude_max;
{
struct frame_info* top;
struct frame_info* current;
int cnt;
/* This function is not thread safe, protect it */
(*Lock_Task) ();
asm volatile (
SAVE (9,72)
SAVE (10,80)
SAVE (11,88)
SAVE (12,96)
SAVE (13,104)
SAVE (14,112)
SAVE (15,120)
SAVE (16,128)
SAVE (17,136)
SAVE (18,144)
SAVE (19,152)
SAVE (20,160)
SAVE (21,168)
SAVE (22,176)
SAVE (23,184)
SAVE (24,192)
SAVE (25,200)
SAVE (26,208)
SAVE (27,216)
SAVE (28,224)
SAVE (29,232)
SAVE (30,240)
: : "r" (&theRegisters));
trace_alloc_chain = NULL;
set_current_pc ();
top = current = get_current_frame ();
cnt = 0;
/* We skip the call to this function, it makes no sense to record it. */
for (cnt = 0; cnt < SKIP_FRAME; cnt += 1) {
current = get_prev_frame (current);
}
cnt = 0;
while (cnt < size)
{
if (STOP_FRAME)
break;
if (current->pc < (CORE_ADDR) exclude_min
|| current->pc > (CORE_ADDR) exclude_max)
array[cnt++] = (void*) (current->pc + PC_ADJUST);
current = get_prev_frame (current);
}
free_trace_alloc ();
(*Unlock_Task) ();
return cnt;
}
#endif
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