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Valgrind-side handling (fast case) for the ppc64 ELF stack redzone.

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5545
This commit is contained in:
Julian Seward 2006-01-18 04:16:27 +00:00
parent e9d09cb891
commit b4628a7314
1 changed files with 68 additions and 0 deletions
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68
memcheck/mc_main.c
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@ -1006,6 +1006,7 @@ void MC_(helperc_MAKE_STACK_UNINIT) ( Addr base, UWord len )
any attempt to access it will elicit an addressing error,
and that's good enough.
*/
/* 128 bytes (16 ULongs) is the magic value for ELF amd64. */
if (EXPECTED_TAKEN( len == 128
&& VG_IS_8_ALIGNED(base)
)) {
@ -1050,7 +1051,74 @@ void MC_(helperc_MAKE_STACK_UNINIT) ( Addr base, UWord len )
}
}
/* 288 bytes (36 ULongs) is the magic value for ELF ppc64. */
if (EXPECTED_TAKEN( len == 288
&& VG_IS_8_ALIGNED(base)
)) {
/* Now we know the address range is suitably sized and
aligned. */
UWord a_lo = (UWord)base;
UWord a_hi = (UWord)(base + 287);
UWord sec_lo = a_lo >> 16;
UWord sec_hi = a_hi >> 16;
if (EXPECTED_TAKEN( sec_lo == sec_hi
&& sec_lo <= N_PRIMARY_MAP
)) {
/* Now we know that the entire address range falls within a
single secondary map, and that that secondary 'lives' in
the main primary map. */
SecMap* sm = primary_map[sec_lo];
if (EXPECTED_TAKEN( !is_distinguished_sm(sm) )) {
/* And finally, now we know that the secondary in question
is modifiable. */
UWord v_off = a_lo & 0xFFFF;
ULong* p = (ULong*)(&sm->vbyte[v_off]);
p[ 0] = VGM_WORD64_INVALID;
p[ 1] = VGM_WORD64_INVALID;
p[ 2] = VGM_WORD64_INVALID;
p[ 3] = VGM_WORD64_INVALID;
p[ 4] = VGM_WORD64_INVALID;
p[ 5] = VGM_WORD64_INVALID;
p[ 6] = VGM_WORD64_INVALID;
p[ 7] = VGM_WORD64_INVALID;
p[ 8] = VGM_WORD64_INVALID;
p[ 9] = VGM_WORD64_INVALID;
p[10] = VGM_WORD64_INVALID;
p[11] = VGM_WORD64_INVALID;
p[12] = VGM_WORD64_INVALID;
p[13] = VGM_WORD64_INVALID;
p[14] = VGM_WORD64_INVALID;
p[15] = VGM_WORD64_INVALID;
p[16] = VGM_WORD64_INVALID;
p[17] = VGM_WORD64_INVALID;
p[18] = VGM_WORD64_INVALID;
p[19] = VGM_WORD64_INVALID;
p[20] = VGM_WORD64_INVALID;
p[21] = VGM_WORD64_INVALID;
p[22] = VGM_WORD64_INVALID;
p[23] = VGM_WORD64_INVALID;
p[24] = VGM_WORD64_INVALID;
p[25] = VGM_WORD64_INVALID;
p[26] = VGM_WORD64_INVALID;
p[27] = VGM_WORD64_INVALID;
p[28] = VGM_WORD64_INVALID;
p[29] = VGM_WORD64_INVALID;
p[30] = VGM_WORD64_INVALID;
p[31] = VGM_WORD64_INVALID;
p[32] = VGM_WORD64_INVALID;
p[33] = VGM_WORD64_INVALID;
p[34] = VGM_WORD64_INVALID;
p[35] = VGM_WORD64_INVALID;
return;
}
}
}
/* else fall into slow case */
if (0) VG_(printf)("MC_(helperc_MAKE_STACK_UNINIT): "
"slow case, %d\n", len);
mc_make_writable(base, len);
}