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asan.c (asan_emit_stack_protection): Use full-sized mask to align the base address on 64-bit strict-alignment platforms.

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* asan.c (asan_emit_stack_protection): Use full-sized mask to align
	the base address on 64-bit strict-alignment platforms.

From-SVN: r268949
This commit is contained in:
Eric Botcazou 2019-02-15 21:40:24 +00:00
parent dd66d9d71d
commit 362432c00d
2 changed files with 13 additions and 7 deletions
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8
gcc/ChangeLog
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@ -1,7 +1,11 @@
2019-02-15 Eric Botcazou <ebotcazou@adacore.com>
* asan.c (asan_emit_stack_protection): Use full-sized mask to align
the base address on 64-bit strict-alignment platforms.
2019-02-15 H.J. Lu <hongjiu.lu@intel.com>
* config/i386/i386.h (VALID_MMX_REG_MODE): Correct the misplaced
')'.
* config/i386/i386.h (VALID_MMX_REG_MODE): Correct the misplaced ')'.
2019-02-15 Uroš Bizjak <ubizjak@gmail.com>

12
gcc/asan.c
View file

@ -1440,13 +1440,15 @@ asan_emit_stack_protection (rtx base, rtx pbase, unsigned int alignb,
base_align_bias = ((asan_frame_size + alignb - 1)
& ~(alignb - HOST_WIDE_INT_1)) - asan_frame_size;
}
/* Align base if target is STRICT_ALIGNMENT. */
if (STRICT_ALIGNMENT)
base = expand_binop (Pmode, and_optab, base,
gen_int_mode (-((GET_MODE_ALIGNMENT (SImode)
<< ASAN_SHADOW_SHIFT)
/ BITS_PER_UNIT), Pmode), NULL_RTX,
1, OPTAB_DIRECT);
{
const HOST_WIDE_INT align
= (GET_MODE_ALIGNMENT (SImode) / BITS_PER_UNIT) << ASAN_SHADOW_SHIFT;
base = expand_binop (Pmode, and_optab, base, gen_int_mode (-align, Pmode),
NULL_RTX, 1, OPTAB_DIRECT);
}
if (use_after_return_class == -1 && pbase)
emit_move_insn (pbase, base);