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runtime: fix mmap comments

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We only pass lower 32 bits of file offset to asm routine.

R=r, dave, rsc
CC=golang-dev
https://golang.org/cl/6499118
This commit is contained in:
Shenghou Ma 2012-09-21 13:50:02 +08:00
parent 8572950383
commit b151af1f36
4 changed files with 6 additions and 3 deletions
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3
src/pkg/runtime/runtime.h
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@ -728,6 +728,9 @@ void runtime·parfordo(ParFor *desc);
/* /*
* low level C-called * low level C-called
*/ */
// for mmap, we only pass the lower 32 bits of file offset to the
// assembly routine; the higher bits (if required), should be provided
// by the assembly routine as 0.
uint8* runtime·mmap(byte*, uintptr, int32, int32, int32, uint32); uint8* runtime·mmap(byte*, uintptr, int32, int32, int32, uint32);
void runtime·munmap(byte*, uintptr); void runtime·munmap(byte*, uintptr);
void runtime·madvise(byte*, uintptr, int32); void runtime·madvise(byte*, uintptr, int32);

2
src/pkg/runtime/sys_freebsd_386.s
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@ -89,7 +89,7 @@ TEXT runtime·mmap(SB),7,$32
MOVSL MOVSL
MOVSL MOVSL
MOVSL MOVSL
MOVL $0, AX // top 64 bits of file offset MOVL $0, AX // top 32 bits of file offset
STOSL STOSL
MOVL $477, AX MOVL $477, AX
INT $0x80 INT $0x80

2
src/pkg/runtime/sys_netbsd_386.s
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@ -68,7 +68,7 @@ TEXT runtime·mmap(SB),7,$36
MOVL $0, AX MOVL $0, AX
STOSL // arg 6 - pad STOSL // arg 6 - pad
MOVSL // arg 7 - offset MOVSL // arg 7 - offset
MOVL $0, AX // top 64 bits of file offset MOVL $0, AX // top 32 bits of file offset
STOSL STOSL
MOVL $197, AX // sys_mmap MOVL $197, AX // sys_mmap
INT $0x80 INT $0x80

2
src/pkg/runtime/sys_openbsd_386.s
View File

@ -69,7 +69,7 @@ TEXT runtime·mmap(SB),7,$36
MOVL $0, AX MOVL $0, AX
STOSL // arg 6 - pad STOSL // arg 6 - pad
MOVSL // arg 7 - offset MOVSL // arg 7 - offset
MOVL $0, AX // top 64 bits of file offset MOVL $0, AX // top 32 bits of file offset
STOSL STOSL
MOVL $197, AX // sys_mmap MOVL $197, AX // sys_mmap
INT $0x80 INT $0x80