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am 026b6ab6: Merge "Allocate additional space on stack for indirect syscall"

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* commit '026b6ab6d5f0d8fca5cdfab05727197626769dc2':
  Allocate additional space on stack for indirect syscall
This commit is contained in:
Elliott Hughes 2013-12-20 15:41:59 -08:00 committed by Android Git Automerger
commit 9f65022f8f
1 changed files with 8 additions and 0 deletions
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8
libc/arch-mips/bionic/syscall.S
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@ -32,6 +32,12 @@
.align 4
.ent syscall
/*
* The caller is only required to allocate 16 bytes of stack for a0-a3.
* syscall has up to 6 arguments, so we need space for the extra two arguments.
*/
#define STACKSIZE 2*4
syscall:
.set noreorder
.cpload $t9
@ -42,9 +48,11 @@ syscall:
lw $a3, 16($sp)
lw $t0, 20($sp)
lw $t1, 24($sp)
subu $sp, STACKSIZE
sw $t0, 16($sp)
sw $t1, 20($sp)
syscall
addu $sp, STACKSIZE
bnez $a3, 1f
move $a0, $v0
j $ra