https://bugs.kde.org/show_bug.cgi?id=385409
Mark Wielaard <m...@klomp.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |m...@klomp.org
--- Comment #40 from Mark Wielaard <m...@klomp.org> ---
Created attachment 114334
--> https://bugs.kde.org/attachment.cgi?id=114334&action=edit
simple z13 executable with strlen inlined
Here is a hopefully simpler reproducer for the following program compiled with
GCC 8.2.1 with gcc -march=z13 -mtune=z14 -Wall -g -O2 -o t t.c
# cat t.c
#include <string.h>
#include <stdlib.h>
int
main (int argc, char **argv)
{
int status = argc > 1;
if (status)
{
char *str = strdup (argv[1]);
int len1 = strlen (argv[1]);
int len2 = strlen (str);
status &= len1 < 8 && len2 > 4;
free (str);
}
exit (!status);
}
# gcc -march=z13 -mtune=z14 -Wall -g -O2 -o t t.c
# ./vg-in-place -q ./t hello
==6001== Conditional jump or move depends on uninitialised value(s)
==6001== at 0x10005E8: main (t.c:12)
==6001==
==6001== Conditional jump or move depends on uninitialised value(s)
==6001== at 0x1000610: main (t.c:12)
==6001==
==6001== Conditional jump or move depends on uninitialised value(s)
==6001== at 0x1000614: main (t.c:12)
==6001==
==6001== Conditional jump or move depends on uninitialised value(s)
==6001== at 0x100062C: main (t.c:13)
==6001==
# ./vg-in-place --vgdb-error=0 ./t hello
# gdb ./t
0x00000000040013c0 in _start () from /lib/ld64.so.1
(gdb) c
Continuing.
Program received signal SIGTRAP, Trace/breakpoint trap.
0x00000000010005e8 in main (argc=<optimized out>, argv=0x1ffefffcb8) at t.c:12
12 int len2 = strlen (str);
(gdb) disassemble
Dump of assembler code for function main:
0x0000000001000528 <+0>: stmg %r12,%r15,96(%r15)
0x000000000100052e <+6>: lay %r15,-160(%r15)
0x0000000001000534 <+12>: cijh %r2,1,0x1000550 <main+40>
0x000000000100053a <+18>: lhi %r12,0
0x000000000100053e <+22>: lr %r2,%r12
0x0000000001000540 <+24>: xilf %r2,1
0x0000000001000546 <+30>: lgfr %r2,%r2
0x000000000100054a <+34>: brasl %r14,0x10004c8 <exit@plt>
0x0000000001000550 <+40>: lgr %r12,%r3
0x0000000001000554 <+44>: lg %r2,8(%r3)
0x000000000100055a <+50>: brasl %r14,0x1000508 <__strdup@plt>
0x0000000001000560 <+56>: lg %r3,8(%r12)
0x0000000001000566 <+62>: lghi %r4,0
0x000000000100056a <+66>: risbg %r1,%r3,60,191,0
0x0000000001000570 <+72>: je 0x100059a <main+114>
0x0000000001000574 <+76>: lghi %r5,15
0x0000000001000578 <+80>: sgr %r5,%r1
0x000000000100057c <+84>: vll %v0,%r5,0(%r3)
0x0000000001000582 <+90>: aghi %r4,16
0x0000000001000586 <+94>: vfenezbs %v0,%v0,%v0
0x000000000100058c <+100>: je 0x10005a2 <main+122>
0x0000000001000590 <+104>: vl %v0,0(%r4,%r3)
0x0000000001000596 <+110>: j 0x1000582 <main+90>
0x000000000100059a <+114>: lghi %r5,15
0x000000000100059e <+118>: j 0x1000590 <main+104>
0x00000000010005a2 <+122>: vlgvb %r1,%v0,7
0x00000000010005a8 <+128>: llgcr %r1,%r1
0x00000000010005ac <+132>: cgr %r1,%r5
0x00000000010005b0 <+136>: la %r5,1(%r5)
0x00000000010005b4 <+140>: locgrh %r4,%r5
0x00000000010005b8 <+144>: jh 0x100059a <main+114>
0x00000000010005bc <+148>: lay %r5,-16(%r4,%r1)
0x00000000010005c2 <+154>: lghi %r4,0
0x00000000010005c6 <+158>: risbg %r1,%r2,60,191,0
0x00000000010005cc <+164>: je 0x10005f6 <main+206>
0x00000000010005d0 <+168>: lghi %r3,15
0x00000000010005d4 <+172>: sgr %r3,%r1
0x00000000010005d8 <+176>: vll %v0,%r3,0(%r2)
0x00000000010005de <+182>: aghi %r4,16
0x00000000010005e2 <+186>: vfenezbs %v0,%v0,%v0
=> 0x00000000010005e8 <+192>: je 0x10005fe <main+214>
0x00000000010005ec <+196>: vl %v0,0(%r4,%r2)
0x00000000010005f2 <+202>: j 0x10005de <main+182>
0x00000000010005f6 <+206>: lghi %r3,15
0x00000000010005fa <+210>: j 0x10005ec <main+196>
0x00000000010005fe <+214>: vlgvb %r1,%v0,7
0x0000000001000604 <+220>: llgcr %r1,%r1
0x0000000001000608 <+224>: cgr %r1,%r3
0x000000000100060c <+228>: la %r3,1(%r3)
0x0000000001000610 <+232>: locgrh %r4,%r3
0x0000000001000614 <+236>: jh 0x10005f6 <main+206>
0x0000000001000618 <+240>: lay %r1,-16(%r4,%r1)
0x000000000100061e <+246>: cijh %r5,7,0x100063c <main+276>
0x0000000001000624 <+252>: chi %r1,4
0x0000000001000628 <+256>: lhi %r12,0
0x000000000100062c <+260>: lochih %r12,1
0x0000000001000632 <+266>: brasl %r14,0x10004a8 <free@plt>
0x0000000001000638 <+272>: j 0x100053e <main+22>
0x000000000100063c <+276>: lhi %r12,0
0x0000000001000640 <+280>: j 0x1000632 <main+266>
End of assembler dump.
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