fb0576e983
clang was using eax to construct %0 here:
asm ("mov %%eax, 0(%0)\n\t"
"mov %%ebx, 4(%0)\n\t"
"mov %%ecx, 8(%0)\n\t"
"mov %%edx, 12(%0)\n\t"
"mov %%esi, 16(%0)\n\t"
"mov %%edi, 20(%0)\n\t"
: /* no output operands */
: "r" (data)
: "eax", "ebx", "ecx", "edx", "esi", "edi");
which caused amd64-word.exp (and others similarly) to fail.
It's a perfectly legit thing for clang to do given the available data.
The patch fixes this by marking the registers as live from the
time of the preceding breakpoint.
gdb/testsuite/ChangeLog:
* gdb.arch/amd64-pseudo.c (main): Rewrite to better specify when
eax,etc. are live with values set by gdb and thus the compiler can't
use them.
* gdb.arch/i386-pseudo.c (main): Ditto.
63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/* Test program for byte registers.
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Copyright 2010-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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int data[] = {
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0x14131211,
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0x24232221,
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0x34333231,
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0x44434241,
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};
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int
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main (int argc, char **argv)
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{
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register int eax asm ("eax");
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register int ebx asm ("ebx");
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register int ecx asm ("ecx");
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register int edx asm ("edx");
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asm ("mov 0(%0), %%eax\n\t"
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"mov 4(%0), %%ebx\n\t"
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"mov 8(%0), %%ecx\n\t"
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"mov 12(%0), %%edx\n\t"
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: /* no output operands */
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: "r" (data)
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: "eax", "ebx", "ecx", "edx");
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asm ("nop" /* first breakpoint here */
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/* i386-{byte,word}.exp write eax-edx here.
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Tell gcc/clang they're live. */
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: "=r" (eax), "=r" (ebx), "=r" (ecx), "=r" (edx)
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: /* no inputs */);
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asm ("mov %%eax, 0(%0)\n\t"
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"mov %%ebx, 4(%0)\n\t"
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"mov %%ecx, 8(%0)\n\t"
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"mov %%edx, 12(%0)\n\t"
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: /* no output operands */
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: "r" (data),
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/* Mark these as inputs so that gcc/clang won't try to use them as
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a temp to build %0. */
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"r" (eax), "r" (ebx), "r" (ecx), "r" (edx));
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puts ("Bye!"); /* second breakpoint here */
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return 0;
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}
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