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2002-05-09 Michael Snyder <msnyder@redhat.com>

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* arm-tdep.c (arm_scan_prologue): Accept strb r(0123),[r11,#-nn],
	strh r(0123),[r11,#-nn], str r(0123),[r11,#-nn], as well as
	strb r(0123),[sp,#nn], strh r(0123),[sp,#nn] and
	str r(0123),[sp,#nn].
	(arm_skip_prologue): Ditto.  Also make disassembly
	order-independent by placing it in a loop.
This commit is contained in:
Michael Snyder 2002-05-09 18:07:00 +00:00
parent 3ce1502b87
commit b8d5e71d0b
2 changed files with 79 additions and 72 deletions
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9
gdb/ChangeLog
View File

@ -1,3 +1,12 @@
2002-05-09 Michael Snyder <msnyder@redhat.com>
* arm-tdep.c (arm_scan_prologue): Accept strb r(0123),[r11,#-nn],
strh r(0123),[r11,#-nn], str r(0123),[r11,#-nn], as well as
strb r(0123),[sp,#nn], strh r(0123),[sp,#nn] and
str r(0123),[sp,#nn].
(arm_skip_prologue): Ditto. Also make disassembly
order-independent by placing it in a loop.
2002-05-09 Mark Kettenis <kettenis@gnu.org>
* i386-tdep.h (i386_abi): New enum.

142
gdb/arm-tdep.c
View File

@ -417,7 +417,7 @@ arm_skip_prologue (CORE_ADDR pc)
{
unsigned long inst;
CORE_ADDR skip_pc;
CORE_ADDR func_addr, func_end;
CORE_ADDR func_addr, func_end = 0;
char *func_name;
struct symtab_and_line sal;
@ -449,74 +449,63 @@ arm_skip_prologue (CORE_ADDR pc)
/* Can't find the prologue end in the symbol table, try it the hard way
by disassembling the instructions. */
skip_pc = pc;
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 */
/* 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)
{
skip_pc += 4;
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;
}
/* Some prologues begin with "str lr, [sp, #-4]!". */
if (inst == 0xe52de004) /* str lr, [sp, #-4]! */
{
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);
}
if ((inst & 0xfffff800) == 0xe92dd800) /* stmfd sp!,{fp,ip,lr,pc} */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
/* 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]! */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
else
{
while ((inst & 0xffff8fff) == 0xed6d0103) /* stfe fn, [sp, #-12]! */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
}
if ((inst & 0xfffff000) == 0xe24cb000) /* sub fp, ip, #nn */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
if ((inst & 0xfffff000) == 0xe24dd000) /* sub sp, sp, #nn */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
while ((inst & 0xffffcfc0) == 0xe50b0000) /* str r(0123), [r11, #-nn] */
{
skip_pc += 4;
inst = read_memory_integer (skip_pc, 4);
}
return skip_pc;
return skip_pc; /* End of prologue */
}
/* *INDENT-OFF* */
@ -608,7 +597,7 @@ thumb_scan_prologue (struct frame_info *fi)
whether to save LR (R14). */
mask = (insn & 0xff) | ((insn & 0x100) << 6);
/* Calculate offsets of saved R0-R7 and LR. */
/* Calculate offsets of saved R0-R7 and LR. */
for (regno = ARM_LR_REGNUM; regno >= 0; regno--)
if (mask & (1 << regno))
{
@ -622,7 +611,7 @@ thumb_scan_prologue (struct frame_info *fi)
else if ((insn & 0xff00) == 0xb000) /* add sp, #simm OR
sub sp, #simm */
{
if ((findmask & 1) == 0) /* before push? */
if ((findmask & 1) == 0) /* before push? */
continue;
else
findmask |= 4; /* add/sub sp found */
@ -868,7 +857,7 @@ arm_scan_prologue (struct frame_info *fi)
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 ad"finish"
a frame, which will confuse stack traceback, as well as "finish"
and other operations that rely on a knowledge of the stack
traceback.
@ -881,7 +870,7 @@ arm_scan_prologue (struct frame_info *fi)
[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] */
"str lr, [sp, #-4]!". - Michael Snyder, 2002-04-23] */
sp_offset = fp_offset = 0;
@ -915,7 +904,16 @@ arm_scan_prologue (struct frame_info *fi)
fi->saved_regs[regno] = sp_offset;
}
}
else if ((insn & 0xffffcfc0) == 0xe50b0000) /* str rx, [r11, -n] */
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;
@ -971,7 +969,7 @@ arm_scan_prologue (struct frame_info *fi)
}
else if ((insn & 0xf0000000) != 0xe0000000)
break; /* Condition not true, exit early */
else if ((insn & 0xfe200000) == 0xe8200000) /* ldm? */
else if ((insn & 0xfe200000) == 0xe8200000) /* ldm? */
break; /* Don't scan past a block load */
else
/* The optimizer might shove anything into the prologue,
@ -2072,7 +2070,7 @@ arm_get_next_pc (CORE_ADDR pc)
static void
arm_software_single_step (enum target_signal sig, int insert_bpt)
{
static int next_pc; /* State between setting and unsetting. */
static int next_pc; /* State between setting and unsetting. */
static char break_mem[BREAKPOINT_MAX]; /* Temporary storage for mem@bpt */
if (insert_bpt)