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runtime: ensure that asmsyscall6 follow AIX stack convention

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The function asmsyscall6 must follow AIX stack layout. It means
that its first local variable must be stored after its arguments
area, ie after offset 112.

Fixes #50185

Change-Id: I897731ddd2a9faad8218443a4c2f4b204ad7e173
Reviewed-on: https://go-review.googlesource.com/c/go/+/373074
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Clément Chigot 2021-12-17 11:03:21 +01:00 committed by Cherry Mui
parent 2c58bb2e42
commit 002283eaca
1 changed files with 9 additions and 3 deletions
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12
src/runtime/sys_aix_ppc64.s
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@ -25,7 +25,12 @@ TEXT callCfunction<>(SB), NOSPLIT|NOFRAME,$0
// stored in libcall_fn and store the results in libcall struture
// Up to 6 arguments can be passed to this C function
// Called by runtime.asmcgocall
// It reserves a stack of 288 bytes for the C function.
// It reserves a stack of 288 bytes for the C function. It must
// follow AIX convention, thus the first local variable must
// be stored at the offset 112, after the linker area (48 bytes)
// and the argument area (64).
// The AIX convention is described here:
// https://www.ibm.com/docs/en/aix/7.2?topic=overview-runtime-process-stack
// NOT USING GO CALLING CONVENTION
// runtime.asmsyscall6 is a function descriptor to the real asmsyscall6.
DATA runtime·asmsyscall6+0(SB)/8, $asmsyscall6<>(SB)
@ -34,7 +39,8 @@ DATA runtime·asmsyscall6+16(SB)/8, $0
GLOBL runtime·asmsyscall6(SB), NOPTR, $24
TEXT asmsyscall6<>(SB),NOSPLIT,$256
MOVD R3, 48(R1) // Save libcall for later
// Save libcall for later
MOVD R3, 112(R1)
MOVD libcall_fn(R3), R12
MOVD libcall_args(R3), R9
MOVD 0(R9), R3
@ -50,7 +56,7 @@ TEXT asmsyscall6<>(SB),NOSPLIT,$256
MOVD 40(R1), R2
// Store result in libcall
MOVD 48(R1), R5
MOVD 112(R1), R5
MOVD R3, (libcall_r1)(R5)
MOVD $-1, R6
CMP R6, R3