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unwind-dw2.c (_Unwind_GetGR): Honor DWARF_ZERO_REG.

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* unwind-dw2.c (_Unwind_GetGR): Honor DWARF_ZERO_REG.
        * doc/tm.texi (DWARF_ZERO_REG): New.
        * config/alpha/alpha.c (alpha_sa_mask, alpha_expand_prologue,
        alpha_expand_epilogue): Revert 2003-09-30 change to store zero.
        * config/alpha/alpha.h (DWARF_ZERO_REG): New.

From-SVN: r88331
This commit is contained in:
Richard Henderson 2004-09-30 01:21:27 -07:00 committed by Richard Henderson
parent de39930392
commit 282efe1c41
5 changed files with 23 additions and 16 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2004-09-29 Richard Henderson <rth@redhat.com>
* unwind-dw2.c (_Unwind_GetGR): Honor DWARF_ZERO_REG.
* doc/tm.texi (DWARF_ZERO_REG): New.
* config/alpha/alpha.c (alpha_sa_mask, alpha_expand_prologue,
alpha_expand_epilogue): Revert 2003-09-30 change to store zero.
* config/alpha/alpha.h (DWARF_ZERO_REG): New.
2004-09-29 Ulrich Weigand <uweigand@de.ibm.com>
* builtins.c (expand_builtin_strlen): Do not call emit_move_insn

16
gcc/config/alpha/alpha.c
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@ -5924,11 +5924,6 @@ alpha_sa_mask (unsigned long *imaskP, unsigned long *fmaskP)
break;
imask |= 1UL << regno;
}
/* Glibc likes to use $31 as an unwind stopper for crt0. To
avoid hackery in unwind-dw2.c, we need to actively store a
zero in the prologue of _Unwind_RaiseException et al. */
imask |= 1UL << 31;
}
/* If any register spilled, then spill the return address also. */
@ -6451,14 +6446,6 @@ alpha_expand_prologue (void)
reg_offset += 8;
}
/* Store a zero if requested for unwinding. */
if (imask & (1UL << 31))
{
emit_frame_store_1 (const0_rtx, sa_reg, sa_bias, reg_offset,
gen_rtx_REG (Pmode, 31));
reg_offset += 8;
}
for (i = 0; i < 31; i++)
if (fmask & (1UL << i))
{
@ -6876,9 +6863,6 @@ alpha_expand_epilogue (void)
reg_offset += 8;
}
if (imask & (1UL << 31))
reg_offset += 8;
for (i = 0; i < 31; ++i)
if (fmask & (1UL << i))
{

1
gcc/config/alpha/alpha.h
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@ -1183,6 +1183,7 @@ do { \
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 26)
#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (26)
#define DWARF_ALT_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (64)
#define DWARF_ZERO_REG 31
/* Describe how we implement __builtin_eh_return. */
#define EH_RETURN_DATA_REGNO(N) ((N) < 4 ? (N) + 16 : INVALID_REGNUM)

8
gcc/doc/tm.texi
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@ -2974,6 +2974,14 @@ general register, but an alternate column needs to be used for
signal frames.
@end defmac
@defmac DWARF_ZERO_REG
A C expression whose value is an integer giving a DWARF 2 register
number that is considered to always have the value zero. This should
only be defined if the target has an architected zero register, and
someone decided it was a good idea to use that register number to
terminate the stack backtrace. New ports should avoid this.
@end defmac
@defmac INCOMING_FRAME_SP_OFFSET
A C expression whose value is an integer giving the offset, in bytes,
from the value of the stack pointer register to the top of the stack

5
gcc/unwind-dw2.c
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@ -125,6 +125,11 @@ _Unwind_GetGR (struct _Unwind_Context *context, int index)
int size;
void *ptr;
#ifdef DWARF_ZERO_REG
if (index == DWARF_ZERO_REG)
return 0;
#endif
index = DWARF_REG_TO_UNWIND_COLUMN (index);
if (index >= (int) sizeof(dwarf_reg_size_table))
abort ();