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8a, 8l: implement support for RDTSC instruction.

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Also modify runtime/asm_386.s to use it.

R=rsc
CC=golang-dev
https://golang.org/cl/5634043
This commit is contained in:
Shenghou Ma 2012-02-06 12:49:28 -05:00 committed by Russ Cox
parent 7ac03695f8
commit 6392b43a15
4 changed files with 7 additions and 2 deletions
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1
src/cmd/8a/lex.c
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@ -445,6 +445,7 @@ struct
"RCRB", LTYPE3, ARCRB, "RCRB", LTYPE3, ARCRB,
"RCRL", LTYPE3, ARCRL, "RCRL", LTYPE3, ARCRL,
"RCRW", LTYPE3, ARCRW, "RCRW", LTYPE3, ARCRW,
"RDTSC", LTYPE0, ARDTSC,
"REP", LTYPE0, AREP, "REP", LTYPE0, AREP,
"REPN", LTYPE0, AREPN, "REPN", LTYPE0, AREPN,
"RET", LTYPE0, ARET, "RET", LTYPE0, ARET,

4
src/cmd/8l/8.out.h
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@ -395,7 +395,9 @@ enum as
ACMPXCHGL, ACMPXCHGL,
ACMPXCHGW, ACMPXCHGW,
ACMPXCHG8B, ACMPXCHG8B,
ARDTSC,
AXADDB, AXADDB,
AXADDL, AXADDL,
AXADDW, AXADDW,

2
src/cmd/8l/optab.c
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@ -707,6 +707,8 @@ Optab optab[] =
{ ACMPXCHGW, yrl_ml, Pm, 0xb1 }, { ACMPXCHGW, yrl_ml, Pm, 0xb1 },
{ ACMPXCHG8B, yscond, Pm, 0xc7,(01) }, { ACMPXCHG8B, yscond, Pm, 0xc7,(01) },
{ ARDTSC, ynone, Pm, 0x31 },
{ AXADDB, yrb_mb, Pb, 0x0f,0xc0 }, { AXADDB, yrb_mb, Pb, 0x0f,0xc0 },
{ AXADDL, yrl_ml, Pm, 0xc1 }, { AXADDL, yrl_ml, Pm, 0xc1 },
{ AXADDW, yrl_ml, Pe, 0x0f,0xc1 }, { AXADDW, yrl_ml, Pe, 0x0f,0xc1 },

2
src/pkg/runtime/asm_386.s
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@ -527,7 +527,7 @@ TEXT runtime·getcallersp(SB), 7, $0
// int64 runtime·cputicks(void), so really // int64 runtime·cputicks(void), so really
// void runtime·cputicks(int64 *ticks) // void runtime·cputicks(int64 *ticks)
TEXT runtime·cputicks(SB),7,$0 TEXT runtime·cputicks(SB),7,$0
BYTE $0x0F; BYTE $0x31; // RDTSC; not supported by 8a RDTSC
MOVL ret+0(FP), DI MOVL ret+0(FP), DI
MOVL AX, 0(DI) MOVL AX, 0(DI)
MOVL DX, 4(DI) MOVL DX, 4(DI)