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| author | Shenghou Ma <minux@golang.org> | 2015-10-17 17:46:25 -0400 |
|---|---|---|
| committer | Brad Fitzpatrick <bradfitz@golang.org> | 2015-12-05 17:43:51 +0000 |
| commit | 35e84546d7c3cc599dd5bf31ad86bf8d3d841d04 (patch) | |
| tree | 02bacd0a592dd84c8a695abab3c9e880023715f0 /src/runtime | |
| parent | 4a2915052bcfd1c24d0277be2e4f53f309e7be89 (diff) | |
| download | go-35e84546d7c3cc599dd5bf31ad86bf8d3d841d04.tar.xz | |
runtime: check and fail early with a message if MMX is not available on 386
Fixes #12970.
Change-Id: Id0026e8274e071d65d47df63d65a93110abbec5d
Reviewed-on: https://go-review.googlesource.com/15998
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/asm_386.s | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/src/runtime/asm_386.s b/src/runtime/asm_386.s index 3dcb026f0c..c5f0c51566 100644 --- a/src/runtime/asm_386.s +++ b/src/runtime/asm_386.s @@ -26,6 +26,32 @@ TEXT runtime·rt0_go(SB),NOSPLIT,$0 MOVL SP, (g_stack+stack_hi)(BP) // find out information about the processor we're on +#ifdef GOOS_nacl // NaCl doesn't like PUSHFL/POPFL + JMP has_cpuid +#else + // first see if CPUID instruction is supported. + PUSHFL + PUSHFL + XORL $(1<<21), 0(SP) // flip ID bit + POPFL + PUSHFL + POPL AX + XORL 0(SP), AX + POPFL // restore EFLAGS + TESTL $(1<<21), AX + JNE has_cpuid +#endif + +bad_proc: // show that the program requires MMX. + MOVL $2, 0(SP) + MOVL $bad_proc_msg<>(SB), 4(SP) + MOVL $0x3d, 8(SP) + CALL runtime·write(SB) + MOVL $1, 0(SP) + CALL runtime·exit(SB) + INT $3 + +has_cpuid: MOVL $0, AX CPUID CMPL AX, $0 @@ -48,6 +74,11 @@ notintel: MOVL CX, AX // Move to global variable clobbers CX when generating PIC MOVL AX, runtime·cpuid_ecx(SB) MOVL DX, runtime·cpuid_edx(SB) + + // Check for MMX support + TESTL $(1<<23), DX // MMX + JZ bad_proc + nocpuinfo: // if there is an _cgo_init, call it to let it @@ -129,6 +160,17 @@ ok: INT $3 RET +DATA bad_proc_msg<>+0x00(SB)/8, $"This pro" +DATA bad_proc_msg<>+0x08(SB)/8, $"gram can" +DATA bad_proc_msg<>+0x10(SB)/8, $" only be" +DATA bad_proc_msg<>+0x18(SB)/8, $" run on " +DATA bad_proc_msg<>+0x20(SB)/8, $"processe" +DATA bad_proc_msg<>+0x28(SB)/8, $"rs with " +DATA bad_proc_msg<>+0x30(SB)/8, $"MMX supp" +DATA bad_proc_msg<>+0x38(SB)/4, $"ort." +DATA bad_proc_msg<>+0x3c(SB)/1, $0xa +GLOBL bad_proc_msg<>(SB), RODATA, $0x3d + DATA runtime·mainPC+0(SB)/4,$runtime·main(SB) GLOBL runtime·mainPC(SB),RODATA,$4 |