static inline int
eval_location_expr (struct dwarf_cursor *c, unw_addr_space_t as,
unw_accessors_t *a, unw_word_t addr,
dwarf_loc_t *locp, void *arg)
{
int ret, is_register;
unw_word_t len, val;
/* read the length of the expression: */
if ((ret = dwarf_read_uleb128 (as, a, &addr, &len, arg)) < 0)
return ret;
/* evaluate the expression: */
if ((ret = dwarf_eval_expr (c, &addr, len, &val, &is_register)) < 0)
return ret;
if (is_register)
*locp = DWARF_REG_LOC (c, dwarf_to_unw_regnum (val));
else
*locp = DWARF_MEM_LOC (c, val);
return 0;
}
static int
apply_reg_state (struct dwarf_cursor *c, struct dwarf_reg_state *rs)
{
unw_word_t regnum, addr, cfa, ip;
unw_word_t prev_ip, prev_cfa;
unw_addr_space_t as;
dwarf_loc_t cfa_loc;
unw_accessors_t *a;
int i, ret;
void *arg;
prev_ip = c->ip;
prev_cfa = c->cfa;
as = c->as;
arg = c->as_arg;
a = unw_get_accessors (as);
/* Evaluate the CFA first, because it may be referred to by other
expressions. */
if (rs->reg[DWARF_CFA_REG_COLUMN].where == DWARF_WHERE_REG)
{
/* CFA is equal to [reg] + offset: */
/* As a special-case, if the stack-pointer is the CFA and the
stack-pointer wasn't saved, popping the CFA implicitly pops
the stack-pointer as well. */
if ((rs->reg[DWARF_CFA_REG_COLUMN].val == UNW_TDEP_SP)
&& (UNW_TDEP_SP < ARRAY_SIZE(rs->reg))
&& (rs->reg[UNW_TDEP_SP].where == DWARF_WHERE_SAME))
cfa = c->cfa;
else
{
regnum = dwarf_to_unw_regnum (rs->reg[DWARF_CFA_REG_COLUMN].val);
if ((ret = unw_get_reg ((unw_cursor_t *) c, regnum, &cfa)) < 0)
return ret;
}
cfa += rs->reg[DWARF_CFA_OFF_COLUMN].val;
}
else
{
/* CFA is equal to EXPR: */
assert (rs->reg[DWARF_CFA_REG_COLUMN].where == DWARF_WHERE_EXPR);
addr = rs->reg[DWARF_CFA_REG_COLUMN].val;
if ((ret = eval_location_expr (c, as, a, addr, &cfa_loc, arg)) < 0)
return ret;
/* the returned location better be a memory location... */
if (DWARF_IS_REG_LOC (cfa_loc))
return -UNW_EBADFRAME;
cfa = DWARF_GET_LOC (cfa_loc);
}
for (i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i)
{
switch ((dwarf_where_t) rs->reg[i].where)
{
case DWARF_WHERE_UNDEF:
c->loc[i] = DWARF_NULL_LOC;
break;
case DWARF_WHERE_SAME:
break;
case DWARF_WHERE_CFAREL:
c->loc[i] = DWARF_MEM_LOC (c, cfa + rs->reg[i].val);
break;
case DWARF_WHERE_REG:
c->loc[i] = DWARF_REG_LOC (c, dwarf_to_unw_regnum (rs->reg[i].val));
break;
case DWARF_WHERE_EXPR:
addr = rs->reg[i].val;
if ((ret = eval_location_expr (c, as, a, addr, c->loc + i, arg)) < 0)
return ret;
break;
case DWARF_WHERE_VAL_EXPR:
addr = rs->reg[i].val;
if ((ret = eval_location_expr (c, as, a, addr, c->loc + i, arg)) < 0)
return ret;
c->loc[i] = DWARF_VAL_LOC (c, DWARF_GET_LOC (c->loc[i]));
break;
}
}
c->cfa = cfa;
/* DWARF spec says undefined return address location means end of stack. */
if (DWARF_IS_NULL_LOC (c->loc[c->ret_addr_column]))
c->ip = 0;
else
{
ret = dwarf_get (c, c->loc[c->ret_addr_column], &ip);
if (ret < 0)
return ret;
c->ip = ip;
}
/* XXX: check for ip to be code_aligned */
if (c->ip == prev_ip && c->cfa == prev_cfa)
{
Dprintf ("%s: ip and cfa unchanged; stopping here (ip=0x%lx)\n",
__FUNCTION__, (long) c->ip);
return -UNW_EBADFRAME;
}
if (c->stash_frames)
tdep_stash_frame (c, rs);
return 0;
}
static inline dwarf_loc_t
linux_scratch_loc (struct cursor *c, unw_regnum_t reg)
{
unw_word_t addr = c->sigcontext_addr, fpstate_addr, off;
int ret, is_fpstate = 0;
switch (c->sigcontext_format)
{
case X86_SCF_NONE:
return DWARF_REG_LOC (&c->dwarf, reg);
case X86_SCF_LINUX_SIGFRAME:
break;
case X86_SCF_LINUX_RT_SIGFRAME:
addr += LINUX_UC_MCONTEXT_OFF;
break;
}
switch (reg)
{
case UNW_X86_GS: off = LINUX_SC_GS_OFF; break;
case UNW_X86_FS: off = LINUX_SC_FS_OFF; break;
case UNW_X86_ES: off = LINUX_SC_ES_OFF; break;
case UNW_X86_DS: off = LINUX_SC_DS_OFF; break;
case UNW_X86_EDI: off = LINUX_SC_EDI_OFF; break;
case UNW_X86_ESI: off = LINUX_SC_ESI_OFF; break;
case UNW_X86_EBP: off = LINUX_SC_EBP_OFF; break;
case UNW_X86_ESP: off = LINUX_SC_ESP_OFF; break;
case UNW_X86_EBX: off = LINUX_SC_EBX_OFF; break;
case UNW_X86_EDX: off = LINUX_SC_EDX_OFF; break;
case UNW_X86_ECX: off = LINUX_SC_ECX_OFF; break;
case UNW_X86_EAX: off = LINUX_SC_EAX_OFF; break;
case UNW_X86_TRAPNO: off = LINUX_SC_TRAPNO_OFF; break;
case UNW_X86_EIP: off = LINUX_SC_EIP_OFF; break;
case UNW_X86_CS: off = LINUX_SC_CS_OFF; break;
case UNW_X86_EFLAGS: off = LINUX_SC_EFLAGS_OFF; break;
case UNW_X86_SS: off = LINUX_SC_SS_OFF; break;
/* The following is probably not correct for all possible cases.
Somebody who understands this better should review this for
correctness. */
case UNW_X86_FCW: is_fpstate = 1; off = LINUX_FPSTATE_CW_OFF; break;
case UNW_X86_FSW: is_fpstate = 1; off = LINUX_FPSTATE_SW_OFF; break;
case UNW_X86_FTW: is_fpstate = 1; off = LINUX_FPSTATE_TAG_OFF; break;
case UNW_X86_FCS: is_fpstate = 1; off = LINUX_FPSTATE_CSSEL_OFF; break;
case UNW_X86_FIP: is_fpstate = 1; off = LINUX_FPSTATE_IPOFF_OFF; break;
case UNW_X86_FEA: is_fpstate = 1; off = LINUX_FPSTATE_DATAOFF_OFF; break;
case UNW_X86_FDS: is_fpstate = 1; off = LINUX_FPSTATE_DATASEL_OFF; break;
case UNW_X86_MXCSR: is_fpstate = 1; off = LINUX_FPSTATE_MXCSR_OFF; break;
/* stacked fp registers */
case UNW_X86_ST0: case UNW_X86_ST1: case UNW_X86_ST2: case UNW_X86_ST3:
case UNW_X86_ST4: case UNW_X86_ST5: case UNW_X86_ST6: case UNW_X86_ST7:
is_fpstate = 1;
off = LINUX_FPSTATE_ST0_OFF + 10*(reg - UNW_X86_ST0);
break;
/* SSE fp registers */
case UNW_X86_XMM0_lo: case UNW_X86_XMM0_hi:
case UNW_X86_XMM1_lo: case UNW_X86_XMM1_hi:
case UNW_X86_XMM2_lo: case UNW_X86_XMM2_hi:
case UNW_X86_XMM3_lo: case UNW_X86_XMM3_hi:
case UNW_X86_XMM4_lo: case UNW_X86_XMM4_hi:
case UNW_X86_XMM5_lo: case UNW_X86_XMM5_hi:
case UNW_X86_XMM6_lo: case UNW_X86_XMM6_hi:
case UNW_X86_XMM7_lo: case UNW_X86_XMM7_hi:
is_fpstate = 1;
off = LINUX_FPSTATE_XMM0_OFF + 8*(reg - UNW_X86_XMM0_lo);
break;
case UNW_X86_XMM0:
case UNW_X86_XMM1:
case UNW_X86_XMM2:
case UNW_X86_XMM3:
case UNW_X86_XMM4:
case UNW_X86_XMM5:
case UNW_X86_XMM6:
case UNW_X86_XMM7:
is_fpstate = 1;
off = LINUX_FPSTATE_XMM0_OFF + 16*(reg - UNW_X86_XMM0);
break;
case UNW_X86_FOP:
case UNW_X86_TSS:
case UNW_X86_LDT:
default:
return DWARF_REG_LOC (&c->dwarf, reg);
}
if (is_fpstate)
{
if ((ret = dwarf_get (&c->dwarf,
DWARF_MEM_LOC (&c->dwarf,
addr + LINUX_SC_FPSTATE_OFF),
&fpstate_addr)) < 0)
return DWARF_NULL_LOC;
if (!fpstate_addr)
return DWARF_NULL_LOC;
return DWARF_MEM_LOC (c, fpstate_addr + off);
}
else
return DWARF_MEM_LOC (c, addr + off);
}
HIDDEN dwarf_loc_t
x86_get_scratch_loc (struct cursor *c, unw_regnum_t reg)
{
unw_word_t addr = c->sigcontext_addr, off, xmm_off;
unw_word_t fpstate, fpformat;
int ret, is_fpstate = 0, is_xmmstate = 0;
switch (c->sigcontext_format)
{
case X86_SCF_NONE:
return DWARF_REG_LOC (&c->dwarf, reg);
case X86_SCF_FREEBSD_SIGFRAME:
addr += offsetof(struct sigframe, sf_uc) + FREEBSD_UC_MCONTEXT_OFF;
break;
case X86_SCF_FREEBSD_SIGFRAME4:
abort();
break;
case X86_SCF_FREEBSD_OSIGFRAME:
/* XXXKIB */
abort();
break;
case X86_SCF_FREEBSD_SYSCALL:
/* XXXKIB */
abort();
break;
default:
/* XXXKIB */
abort();
break;
}
off = 0; /* shut gcc warning */
switch (reg)
{
case UNW_X86_GS: off = FREEBSD_UC_MCONTEXT_GS_OFF; break;
case UNW_X86_FS: off = FREEBSD_UC_MCONTEXT_FS_OFF; break;
case UNW_X86_ES: off = FREEBSD_UC_MCONTEXT_ES_OFF; break;
case UNW_X86_DS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
case UNW_X86_EDI: off = FREEBSD_UC_MCONTEXT_EDI_OFF; break;
case UNW_X86_ESI: off = FREEBSD_UC_MCONTEXT_ESI_OFF; break;
case UNW_X86_EBP: off = FREEBSD_UC_MCONTEXT_EBP_OFF; break;
case UNW_X86_ESP: off = FREEBSD_UC_MCONTEXT_ESP_OFF; break;
case UNW_X86_EBX: off = FREEBSD_UC_MCONTEXT_EBX_OFF; break;
case UNW_X86_EDX: off = FREEBSD_UC_MCONTEXT_EDX_OFF; break;
case UNW_X86_ECX: off = FREEBSD_UC_MCONTEXT_ECX_OFF; break;
case UNW_X86_EAX: off = FREEBSD_UC_MCONTEXT_EAX_OFF; break;
case UNW_X86_TRAPNO: off = FREEBSD_UC_MCONTEXT_TRAPNO_OFF; break;
case UNW_X86_EIP: off = FREEBSD_UC_MCONTEXT_EIP_OFF; break;
case UNW_X86_CS: off = FREEBSD_UC_MCONTEXT_CS_OFF; break;
case UNW_X86_EFLAGS: off = FREEBSD_UC_MCONTEXT_EFLAGS_OFF; break;
case UNW_X86_SS: off = FREEBSD_UC_MCONTEXT_SS_OFF; break;
case UNW_X86_FCW:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_CW_OFF;
xmm_off = FREEBSD_UC_MCONTEXT_CW_XMM_OFF;
break;
case UNW_X86_FSW:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_SW_OFF;
xmm_off = FREEBSD_UC_MCONTEXT_SW_XMM_OFF;
break;
case UNW_X86_FTW:
is_fpstate = 1;
xmm_off = FREEBSD_UC_MCONTEXT_TAG_XMM_OFF;
off = FREEBSD_UC_MCONTEXT_TAG_OFF;
break;
case UNW_X86_FCS:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_CSSEL_OFF;
xmm_off = FREEBSD_UC_MCONTEXT_CSSEL_XMM_OFF;
break;
case UNW_X86_FIP:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_IPOFF_OFF;
xmm_off = FREEBSD_UC_MCONTEXT_IPOFF_XMM_OFF;
break;
case UNW_X86_FEA:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_DATAOFF_OFF;
xmm_off = FREEBSD_UC_MCONTEXT_DATAOFF_XMM_OFF;
break;
case UNW_X86_FDS:
is_fpstate = 1;
off = FREEBSD_US_MCONTEXT_DATASEL_OFF;
xmm_off = FREEBSD_US_MCONTEXT_DATASEL_XMM_OFF;
break;
case UNW_X86_MXCSR:
is_fpstate = 1;
is_xmmstate = 1;
xmm_off = FREEBSD_UC_MCONTEXT_MXCSR_XMM_OFF;
break;
/* stacked fp registers */
case UNW_X86_ST0: case UNW_X86_ST1: case UNW_X86_ST2: case UNW_X86_ST3:
case UNW_X86_ST4: case UNW_X86_ST5: case UNW_X86_ST6: case UNW_X86_ST7:
is_fpstate = 1;
off = FREEBSD_UC_MCONTEXT_ST0_OFF + 10*(reg - UNW_X86_ST0);
xmm_off = FREEBSD_UC_MCONTEXT_ST0_XMM_OFF + 10*(reg - UNW_X86_ST0);
break;
/* SSE fp registers */
case UNW_X86_XMM0_lo: case UNW_X86_XMM0_hi:
case UNW_X86_XMM1_lo: case UNW_X86_XMM1_hi:
case UNW_X86_XMM2_lo: case UNW_X86_XMM2_hi:
case UNW_X86_XMM3_lo: case UNW_X86_XMM3_hi:
case UNW_X86_XMM4_lo: case UNW_X86_XMM4_hi:
case UNW_X86_XMM5_lo: case UNW_X86_XMM5_hi:
case UNW_X86_XMM6_lo: case UNW_X86_XMM6_hi:
case UNW_X86_XMM7_lo: case UNW_X86_XMM7_hi:
is_fpstate = 1;
is_xmmstate = 1;
xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 8*(reg - UNW_X86_XMM0_lo);
break;
case UNW_X86_XMM0:
case UNW_X86_XMM1:
case UNW_X86_XMM2:
case UNW_X86_XMM3:
case UNW_X86_XMM4:
case UNW_X86_XMM5:
case UNW_X86_XMM6:
case UNW_X86_XMM7:
is_fpstate = 1;
is_xmmstate = 1;
xmm_off = FREEBSD_UC_MCONTEXT_XMM0_OFF + 16*(reg - UNW_X86_XMM0);
break;
case UNW_X86_FOP:
case UNW_X86_TSS:
case UNW_X86_LDT:
default:
return DWARF_REG_LOC (&c->dwarf, reg);
}
if (is_fpstate)
{
if ((ret = dwarf_get (&c->dwarf,
DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPSTATE_OFF),
&fpstate)) < 0)
return DWARF_NULL_LOC;
if (fpstate == FREEBSD_UC_MCONTEXT_FPOWNED_NONE)
return DWARF_NULL_LOC;
if ((ret = dwarf_get (&c->dwarf,
DWARF_MEM_LOC (&c->dwarf, addr + FREEBSD_UC_MCONTEXT_FPFORMAT_OFF),
&fpformat)) < 0)
return DWARF_NULL_LOC;
if (fpformat == FREEBSD_UC_MCONTEXT_FPFMT_NODEV ||
(is_xmmstate && fpformat != FREEBSD_UC_MCONTEXT_FPFMT_XMM))
return DWARF_NULL_LOC;
if (is_xmmstate)
off = xmm_off;
}
return DWARF_MEM_LOC (c, addr + off);
}