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x86: checkasm: check for or handle missing cleanup after MMX instructions

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Not every asm routine is expected clear the MMX state after returning.
It is however a requisite for testing floating point code in checkasm.
Annotate functions requiring cleanup with declare_func_emms() and issue
emms after the call. The remaining functions are checked for having  a
cleared MMX state after return.
This commit is contained in:
Janne Grunau 2015-12-11 14:06:38 +01:00
parent cc29d96d5a
commit 711781d7a1
4 changed files with 78 additions and 26 deletions
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16
tests/checkasm/checkasm.h
View File

@ -26,6 +26,7 @@
#include <stdint.h>
#include "config.h"
#include "libavutil/avstring.h"
#include "libavutil/cpu.h"
#include "libavutil/lfg.h"
#include "libavutil/timer.h"
@ -54,6 +55,7 @@ static av_unused void *func_ref, *func_new;
/* Declare the function prototype. The first argument is the return value, the remaining
* arguments are the function parameters. Naming parameters is optional. */
#define declare_func(ret, ...) declare_new(ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
#define declare_func_emms(cpu_flags, ret, ...) declare_new_emms(cpu_flags, ret, __VA_ARGS__) typedef ret func_type(__VA_ARGS__)
/* Indicate that the current test has failed */
#define fail() checkasm_fail_func("%s:%d", av_basename(__FILE__), __LINE__)
@ -65,8 +67,12 @@ static av_unused void *func_ref, *func_new;
#define call_ref(...) ((func_type *)func_ref)(__VA_ARGS__)
#if ARCH_X86 && HAVE_YASM
/* Verifies that clobbered callee-saved registers are properly saved and restored */
/* Verifies that clobbered callee-saved registers are properly saved and restored
* and that either no MMX registers are touched or emms is issued */
void checkasm_checked_call(void *func, ...);
/* Verifies that clobbered callee-saved registers are properly saved and restored
* and issues emms for asm functions which are not required to do so */
void checkasm_checked_call_emms(void *func, ...);
#if ARCH_X86_64
/* Evil hack: detect incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
@ -81,16 +87,24 @@ void checkasm_checked_call(void *func, ...);
void checkasm_stack_clobber(uint64_t clobber, ...);
#define declare_new(ret, ...) ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__)\
= (void *)checkasm_checked_call;
#define declare_new_emms(cpu_flags, ret, ...) \
ret (*checked_call)(void *, int, int, int, int, int, __VA_ARGS__) = \
((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
(void *)checkasm_checked_call;
#define CLOB (UINT64_C(0xdeadbeefdeadbeef))
#define call_new(...) (checkasm_stack_clobber(CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,\
CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB,CLOB),\
checked_call(func_new, 0, 0, 0, 0, 0, __VA_ARGS__))
#elif ARCH_X86_32
#define declare_new(ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = (void *)checkasm_checked_call;
#define declare_new_emms(cpu_flags, ret, ...) ret (*checked_call)(void *, __VA_ARGS__) = \
((cpu_flags) & av_get_cpu_flags()) ? (void *)checkasm_checked_call_emms : \
(void *)checkasm_checked_call;
#define call_new(...) checked_call(func_new, __VA_ARGS__)
#endif
#else
#define declare_new(ret, ...)
#define declare_new_emms(cpu_flags, ret, ...)
/* Call the function */
#define call_new(...) ((func_type *)func_new)(__VA_ARGS__)
#endif

8
tests/checkasm/h264pred.c
View File

@ -144,7 +144,7 @@ static void check_pred4x4(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
if (chroma_format == 1) {
uint8_t *topright = buf0 + 2*16;
int pred_mode;
declare_func(void, uint8_t *src, const uint8_t *topright, ptrdiff_t stride);
declare_func_emms(AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT, void, uint8_t *src, const uint8_t *topright, ptrdiff_t stride);
for (pred_mode = 0; pred_mode < 15; pred_mode++) {
if (check_pred_func(h->pred4x4[pred_mode], "4x4", pred4x4_modes[codec][pred_mode])) {
@ -163,7 +163,7 @@ static void check_pred8x8(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
int codec, int chroma_format, int bit_depth)
{
int pred_mode;
declare_func(void, uint8_t *src, ptrdiff_t stride);
declare_func_emms(AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT, void, uint8_t *src, ptrdiff_t stride);
for (pred_mode = 0; pred_mode < 11; pred_mode++) {
if (check_pred_func(h->pred8x8[pred_mode], (chroma_format == 2) ? "8x16" : "8x8",
@ -183,7 +183,7 @@ static void check_pred16x16(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
{
if (chroma_format == 1) {
int pred_mode;
declare_func(void, uint8_t *src, ptrdiff_t stride);
declare_func_emms(AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT, void, uint8_t *src, ptrdiff_t stride);
for (pred_mode = 0; pred_mode < 9; pred_mode++) {
if (check_pred_func(h->pred16x16[pred_mode], "16x16", pred16x16_modes[codec][pred_mode])) {
@ -203,7 +203,7 @@ static void check_pred8x8l(H264PredContext *h, uint8_t *buf0, uint8_t *buf1,
{
if (chroma_format == 1 && codec_ids[codec] == AV_CODEC_ID_H264) {
int pred_mode;
declare_func(void, uint8_t *src, int topleft, int topright, ptrdiff_t stride);
declare_func_emms(AV_CPU_FLAG_MMXEXT, void, uint8_t *src, int topleft, int topright, ptrdiff_t stride);
for (pred_mode = 0; pred_mode < 12; pred_mode++) {
if (check_pred_func(h->pred8x8l[pred_mode], "8x8l", pred4x4_modes[codec][pred_mode])) {

2
tests/checkasm/h264qpel.c
View File

@ -55,7 +55,7 @@ void checkasm_check_h264qpel(void)
LOCAL_ALIGNED_16(uint8_t, dst1, [BUF_SIZE]);
H264QpelContext h;
int op, bit_depth, i, j;
declare_func(void, uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
declare_func_emms(AV_CPU_FLAG_MMX | AV_CPU_FLAG_MMXEXT, void, uint8_t *dst, const uint8_t *src, ptrdiff_t stride);
for (op = 0; op < 2; op++) {
qpel_mc_func (*tab)[16] = op ? h.avg_h264_qpel_pixels_tab : h.put_h264_qpel_pixels_tab;

78
tests/checkasm/x86/checkasm.asm
View File

@ -26,6 +26,7 @@
SECTION_RODATA
error_message: db "failed to preserve register", 0
error_message_emms: db "failed to issue emms", 0
%if ARCH_X86_64
; just random numbers to reduce the chance of incidental match
@ -83,11 +84,22 @@ cglobal stack_clobber, 1,2
DECLARE_REG_TMP 7
%endif
%macro report_fail 1
mov r9, rax
mov r10, rdx
lea r0, [%1]
xor eax, eax
call fail_func
mov rdx, r10
mov rax, r9
%endmacro
;-----------------------------------------------------------------------------
; void checkasm_checked_call(void *func, ...)
;-----------------------------------------------------------------------------
INIT_XMM
cglobal checked_call, 2,15,16,max_args*8+8
%macro check_call 0-1
cglobal checked_call%1, 2,15,16,max_args*8+8
mov t0, r0
; All arguments have been pushed on the stack instead of registers in order to
@ -154,16 +166,22 @@ cglobal checked_call, 2,15,16,max_args*8+8
; Call fail_func() with a descriptive message to mark it as a failure
; if the called function didn't preserve all callee-saved registers.
; Save the return value located in rdx:rax first to prevent clobbering.
jz .ok
mov r9, rax
mov r10, rdx
lea r0, [error_message]
xor eax, eax
call fail_func
mov rdx, r10
mov rax, r9
.ok:
jz .clobber_ok
report_fail error_message
.clobber_ok:
%ifnid %1, _emms
fstenv [rsp]
mov r9h, [rsp + 8]
add r9h, 1
jz .emms_ok
report_fail error_message_emms
emms
.emms_ok:
%else
emms
%endif
RET
%endmacro
%else
@ -173,10 +191,21 @@ cglobal checked_call, 2,15,16,max_args*8+8
%define n5 dword 0xb78d0d1d
%define n6 dword 0x33627ba7
%macro report_fail 1
mov r3, eax
mov r4, edx
lea r0, [%1]
mov [esp], r0
call fail_func
mov edx, r4
mov eax, r3
%endmacro
%macro check_call 0-1
;-----------------------------------------------------------------------------
; void checkasm_checked_call(void *func, ...)
;-----------------------------------------------------------------------------
cglobal checked_call, 1,7
cglobal checked_call%1, 1,7
mov r3, n3
mov r4, n4
mov r5, n5
@ -192,16 +221,25 @@ cglobal checked_call, 1,7
or r3, r4
or r5, r6
or r3, r5
jz .ok
mov r3, eax
mov r4, edx
lea r0, [error_message]
mov [esp], r0
call fail_func
mov edx, r4
mov eax, r3
.ok:
jz .clobber_ok
report_fail error_message
.clobber_ok:
%ifnid %1, _emms
fstenv [rsp]
mov r3h, [rsp + 8]
add r3h, 1
jz .emms_ok
report_fail error_message_emms
emms
.emms_ok:
%else
emms
%endif
add esp, max_args*4
REP_RET
%endmacro
%endif ; ARCH_X86_64
check_call
check_call _emms