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Code Issues Releases Activity

(SYSCALL_CFM_SAVE_REG): New macro.

Browse source 
(REASON_SYSCALL): Ditto.
(access_reg): Use __uc_get_reason() to determine how ucontext_t was created.
	Handle UNW_IA64_AR_BSP differently depending on whether or not
	ucontext_t was created by a syscall.  Ditto for UNW_IA64_IP and
	UNW_IA64_CFM.  Add debug statement.

(Logical change 1.77)
This commit is contained in:
mostang.com!davidm 2003-04-08 21:14:16 +00:00
parent 0802cd49ad
commit b10a6c5b9f
1 changed files with 65 additions and 9 deletions
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74
src/ia64/Ginit-ia64.c
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@ -136,15 +136,22 @@ access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
#ifdef HAVE_SYS_UC_ACCESS_H
#define SYSCALL_CFM_SAVE_REG 11 /* on a syscall, ar.pfs is saved in r11 */
#define REASON_SYSCALL 0
static int
access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
void *arg)
{
ucontext_t *uc = arg;
unsigned int nat, mask;
unw_word_t cfm, sol;
uint64_t value;
uint16_t reason;
int ret;
__uc_get_reason (uc, &reason);
switch (reg)
{
case UNW_IA64_GR ... UNW_IA64_GR + 31:
@ -176,10 +183,32 @@ access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
break;
case UNW_IA64_AR ... UNW_IA64_AR + 127:
if (write)
ret = __uc_set_ar (uc, (reg - UNW_IA64_AR), *val);
if (reg == UNW_IA64_AR_BSP)
{
if (reason == REASON_SYSCALL)
ret = __uc_get_grs (uc, SYSCALL_CFM_SAVE_REG, 1, &cfm, &nat);
else
ret = __uc_get_cfm (uc, &cfm);
if (ret)
break;
sol = (cfm >> 7) & 0x7f;
if (write)
ret = __uc_set_ar (uc, (reg - UNW_IA64_AR),
ia64_rse_skip_regs (*val, sol));
else
{
ret = __uc_get_ar (uc, (reg - UNW_IA64_AR), val);
*val = ia64_rse_skip_regs (*val, -sol);
}
}
else
ret = __uc_get_ar (uc, (reg - UNW_IA64_AR), val);
{
if (write)
ret = __uc_set_ar (uc, (reg - UNW_IA64_AR), *val);
else
ret = __uc_get_ar (uc, (reg - UNW_IA64_AR), val);
}
break;
case UNW_IA64_BR ... UNW_IA64_BR + 7:
@ -197,17 +226,40 @@ access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
break;
case UNW_IA64_IP:
if (write)
ret = __uc_set_ip (uc, *val);
if (reason == REASON_SYSCALL)
{
if (write)
ret = __uc_set_brs (uc, 0, 1, val);
else
ret = __uc_get_brs (uc, 0, 1, val);
}
else
ret = __uc_get_ip (uc, val);
{
if (write)
ret = __uc_set_ip (uc, *val);
else
ret = __uc_get_ip (uc, val);
}
break;
case UNW_IA64_CFM:
if (write)
ret = __uc_set_cfm (uc, *val);
if (reason == REASON_SYSCALL)
{
ret = __uc_get_grs (uc, SYSCALL_CFM_SAVE_REG, 1, &cfm, &nat);
if (write)
{
if (ret)
break;
ret = __uc_set_grs (uc, SYSCALL_CFM_SAVE_REG, 1, &cfm, nat);
}
}
else
ret = __uc_get_cfm (uc, val);
{
if (write)
ret = __uc_set_cfm (uc, *val);
else
ret = __uc_get_cfm (uc, val);
}
break;
case UNW_IA64_FR ... UNW_IA64_FR + 127:
@ -219,6 +271,10 @@ access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
if (ret != 0)
return -UNW_EBADREG;
if (write)
debug (100, "%s: %s <- %lx\n", __FUNCTION__, unw_regname (reg), *val);
else
debug (100, "%s: %s -> %lx\n", __FUNCTION__, unw_regname (reg), *val);
return 0;
}