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[FT32] gdb: Correctly interpret function prologs 

The stack unwinder did not understand the function prologs
generated by gcc with -Os. Add code to recognize and interpret the
prolog calls.

[gdb]

2015-10-02  James Bowman  <james.bowman@ftdichip.com>

	* ft32-tdep.c (ft32_analyze_prologue): Add function prolog
	subroutine handling.
This commit is contained in:
jamesbowman 2015-10-02 17:32:47 -07:00
parent 604763ceaa
commit ae4e25019d
2 changed files with 54 additions and 6 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2015-10-02 James Bowman <james.bowman@ftdichip.com>
* ft32-tdep.c (ft32_analyze_prologue): Add function prolog
subroutine handling.
2015-10-01 Simon Marchi <simon.marchi@ericsson.com>
* common/vec.h (VEC_OP (T,cleanup)): Add pointer cast.

55
gdb/ft32-tdep.c
View File

@ -164,33 +164,76 @@ ft32_analyze_prologue (CORE_ADDR start_addr, CORE_ADDR end_addr,
CORE_ADDR next_addr;
ULONGEST inst, inst2;
LONGEST offset;
int regnum;
int regnum, pushreg;
struct bound_minimal_symbol msymbol;
const int first_saved_reg = 13; /* The first saved register. */
/* PROLOGS are addresses of the subroutine prologs, PROLOGS[n]
is the address of __prolog_$rN.
__prolog_$rN pushes registers from 13 through n inclusive.
So for example CALL __prolog_$r15 is equivalent to:
PUSH $r13
PUSH $r14
PUSH $r15
Note that PROLOGS[0] through PROLOGS[12] are unused. */
CORE_ADDR prologs[32];
cache->saved_regs[FT32_PC_REGNUM] = 0;
cache->framesize = 0;
for (regnum = first_saved_reg; regnum < 32; regnum++)
{
char prolog_symbol[32];
snprintf (prolog_symbol, sizeof (prolog_symbol), "__prolog_$r%02d",
regnum);
msymbol = lookup_minimal_symbol (prolog_symbol, NULL, NULL);
if (msymbol.minsym)
prologs[regnum] = BMSYMBOL_VALUE_ADDRESS (msymbol);
else
prologs[regnum] = 0;
}
if (start_addr >= end_addr)
return end_addr;
return end_addr;
cache->established = 0;
for (next_addr = start_addr; next_addr < end_addr; )
for (next_addr = start_addr; next_addr < end_addr;)
{
inst = read_memory_unsigned_integer (next_addr, 4, byte_order);
if (FT32_IS_PUSH (inst))
{
regnum = FT32_R0_REGNUM + FT32_PUSH_REG (inst);
pushreg = FT32_PUSH_REG (inst);
cache->framesize += 4;
cache->saved_regs[regnum] = cache->framesize;
cache->saved_regs[FT32_R0_REGNUM + pushreg] = cache->framesize;
next_addr += 4;
}
else if (FT32_IS_CALL (inst))
{
for (regnum = first_saved_reg; regnum < 32; regnum++)
{
if ((4 * (inst & 0x3ffff)) == prologs[regnum])
{
for (pushreg = first_saved_reg; pushreg <= regnum;
pushreg++)
{
cache->framesize += 4;
cache->saved_regs[FT32_R0_REGNUM + pushreg] =
cache->framesize;
}
next_addr += 4;
}
}
break;
}
else
break;
}
for (regnum = FT32_R0_REGNUM; regnum < FT32_PC_REGNUM; regnum++)
{
if (cache->saved_regs[regnum] != REG_UNAVAIL)
cache->saved_regs[regnum] = cache->framesize - cache->saved_regs[regnum];
cache->saved_regs[regnum] =
cache->framesize - cache->saved_regs[regnum];
}
cache->saved_regs[FT32_PC_REGNUM] = cache->framesize;