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Implement _UCD_access_reg() for ARM

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Implement the Linux version of _UCD_access_reg() for ARM. We can
sidestep the register number remapping, as the libunwind register
numbers match one-to-one to the ELF core file register numbers.
This commit is contained in:
Tommi Rantala 2012-08-15 09:29:34 +03:00
parent 24a0c1f265
commit 21ad2c19ea
1 changed files with 14 additions and 5 deletions
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19
src/coredump/_UCD_access_reg_linux.c
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@ -1,4 +1,5 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
This file is part of libunwind.
@ -30,12 +31,18 @@ _UCD_access_reg (unw_addr_space_t as,
unw_regnum_t regnum, unw_word_t *valp,
int write, void *arg)
{
struct UCD_info *ui = arg;
if (write)
{
Debug(0, "write is not supported\n");
return -UNW_EINVAL;
}
#if defined(UNW_TARGET_ARM)
if (regnum < 0 || regnum >= 16)
goto badreg;
#else
#if defined(UNW_TARGET_X86)
static const uint8_t remap_regs[] =
{
@ -69,13 +76,11 @@ _UCD_access_reg (unw_addr_space_t as,
#error Port me
#endif
struct UCD_info *ui = arg;
if (regnum < 0 || regnum >= (unw_regnum_t)ARRAY_SIZE(remap_regs))
{
Debug(0, "bad regnum:%d\n", regnum);
return -UNW_EINVAL;
}
goto badreg;
regnum = remap_regs[regnum];
#endif
/* pr_reg is a long[] array, but it contains struct user_regs_struct's
* image.
@ -87,4 +92,8 @@ _UCD_access_reg (unw_addr_space_t as,
*valp = ui->prstatus->pr_reg[regnum];
return 0;
badreg:
Debug(0, "bad regnum:%d\n", regnum);
return -UNW_EINVAL;
}