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Bug 721321 - Fix sys_clone() on ARM to work reliably in Thumb-2. r=jbramley

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This commit is contained in:
Mike Hommey 2012-02-13 15:49:05 +01:00
parent ac9a4a0719
commit 818458fdc8
1 changed files with 16 additions and 0 deletions
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16
toolkit/crashreporter/google-breakpad/src/common/linux/linux_syscall_support.h
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@ -2183,8 +2183,24 @@ struct kernel_statfs {
/* In the child, now. Call "fn(arg)".
*/
"ldr r0,[sp, #4]\n"
/* When compiling for Thumb-2 the "MOV LR,PC" here
* won't work because it loads PC+4 into LR,
* whereas the LDR is a 4-byte instruction.
* This results in the child thread always
* crashing with an "Illegal Instruction" when it
* returned into the middle of the LDR instruction
* The instruction sequence used instead was
* recommended by
* "https://wiki.edubuntu.org/ARM/Thumb2PortingHowto#Quick_Reference".
*/
#ifdef __thumb2__
"ldr r7,[sp]\n"
"blx r7\n"
#else
"mov lr,pc\n"
"ldr pc,[sp]\n"
#endif
/* Call _exit(%r0).
*/