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unwind-ia64.c (UNW_REG_B0): New.

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* config/ia64/unwind-ia64.c (UNW_REG_B0): New.
        (struct _Unwind_Context): Expand br_loc to hold it.
        (uw_frame_state_for): Handle leaf functions better.
        (uw_update_reg_address): Update for br_loc change.

From-SVN: r45024
This commit is contained in:
Richard Henderson 2001-08-18 21:55:15 -07:00 committed by Richard Henderson
parent 3dff7ed031
commit 443621af25
2 changed files with 30 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2001-08-18 Richard Henderson <rth@redhat.com>
* config/ia64/unwind-ia64.c (UNW_REG_B0): New.
(struct _Unwind_Context): Expand br_loc to hold it.
(uw_frame_state_for): Handle leaf functions better.
(uw_update_reg_address): Update for br_loc change.
2001-08-18 Richard Henderson <rth@redhat.com>
* crtstuff.c: Move list heads before code that uses them.

28
gcc/config/ia64/unwind-ia64.c
View File

@ -93,7 +93,7 @@ enum unw_register_index
UNW_REG_F31 = UNW_REG_F2 + 29,
/* Branch registers. */
UNW_REG_B1,
UNW_REG_B0, UNW_REG_B1,
UNW_REG_B5 = UNW_REG_B1 + 4,
UNW_NUM_REGS
@ -205,7 +205,7 @@ struct _Unwind_Context
} nat;
} ireg[32 - 2];
unsigned long *br_loc[6 - 1];
unsigned long *br_loc[7];
void *fr_loc[32 - 2];
};
@ -1471,6 +1471,21 @@ uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
not profide a personality routine or LSDA. */
#ifdef MD_FALLBACK_FRAME_STATE_FOR
MD_FALLBACK_FRAME_STATE_FOR (context, fs, success);
/* [SCRA 11.4.1] A leaf function with no memory stack, no exception
handlers, and which keeps the return value in B0 does not need
an unwind table entry.
This can only happen in the frame after unwinding through a signal
handler. Avoid infinite looping by requiring that B0 != RP. */
if (context->br_loc[0] && *context->br_loc[0] != context->rp)
{
fs->curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
fs->curr.reg[UNW_REG_RP].when = -1;
fs->curr.reg[UNW_REG_RP].val = 0;
goto success;
}
return _URC_END_OF_STACK;
success:
return _URC_NO_REASON;
@ -1557,8 +1572,11 @@ uw_update_reg_address (struct _Unwind_Context *context,
break;
case UNW_WHERE_BR:
if (rval >= 1 && rval <= 5)
addr = context->br_loc[rval - 1];
/* Note that while RVAL can only be 1-5 from normal descriptors,
we can want to look at B0 due to having manually unwound a
signal frame. */
if (rval >= 0 && rval <= 5)
addr = context->br_loc[rval];
else
abort ();
break;
@ -1624,7 +1642,7 @@ uw_update_reg_address (struct _Unwind_Context *context,
break;
case UNW_REG_B1 ... UNW_REG_B5:
context->br_loc[regno - UNW_REG_B1] = addr;
context->br_loc[regno - UNW_REG_B0] = addr;
break;
case UNW_REG_BSP: