asm_plan9_386.s

Documentation: syscall

     1// Copyright 2009 The Go Authors. All rights reserved.
     2// Use of this source code is governed by a BSD-style
     3// license that can be found in the LICENSE file.
     4
     5#include "textflag.h"
     6#include "funcdata.h"
     7
     8//
     9// System call support for 386, Plan 9
    10//
    11
    12//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err string)
    13//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err string)
    14//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
    15//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
    16
    17#define SYS_ERRSTR 41	/* from zsysnum_plan9.go */
    18
    19// Trap # in AX, args on stack above caller pc.
    20TEXT	·Syscall(SB),NOSPLIT,$148-32
    21	NO_LOCAL_POINTERS
    22	CALL	runtime·entersyscall(SB)
    23	MOVL	trap+0(FP), AX	// syscall entry
    24	// copy args down
    25	LEAL	a1+4(FP), SI
    26	LEAL	sysargs-144(SP), DI
    27	CLD
    28	MOVSL
    29	MOVSL
    30	MOVSL
    31	INT	$64
    32	MOVL	AX, r1+16(FP)
    33	MOVL	$0, r2+20(FP)
    34	CMPL	AX, $-1
    35	JNE	ok3
    36
    37	LEAL	errbuf-128(SP), AX
    38	MOVL	AX, sysargs-144(SP)
    39	MOVL	$128, sysargs1-140(SP)
    40	MOVL	$SYS_ERRSTR, AX
    41	INT	$64
    42	CALL	runtime·exitsyscall(SB)
    43	MOVL	sysargs-144(SP), AX
    44	MOVL	AX, errbuf-148(SP)
    45	CALL	runtime·gostring(SB)
    46	LEAL	str-144(SP), SI
    47	JMP	copyresult3
    48
    49ok3:
    50	CALL	runtime·exitsyscall(SB)
    51	LEAL	·emptystring(SB), SI
    52
    53copyresult3:
    54	LEAL	err+24(FP), DI
    55
    56	CLD
    57	MOVSL
    58	MOVSL
    59
    60	RET
    61
    62TEXT	·Syscall6(SB),NOSPLIT,$148-44
    63	NO_LOCAL_POINTERS
    64	CALL	runtime·entersyscall(SB)
    65	MOVL	trap+0(FP), AX	// syscall entry
    66	// copy args down
    67	LEAL	a1+4(FP), SI
    68	LEAL	sysargs-144(SP), DI
    69	CLD
    70	MOVSL
    71	MOVSL
    72	MOVSL
    73	MOVSL
    74	MOVSL
    75	MOVSL
    76	INT	$64
    77	MOVL	AX, r1+28(FP)
    78	MOVL	$0, r2+32(FP)
    79	CMPL	AX, $-1
    80	JNE	ok4
    81
    82	LEAL	errbuf-128(SP), AX
    83	MOVL	AX, sysargs-144(SP)
    84	MOVL	$128, sysargs1-140(SP)
    85	MOVL	$SYS_ERRSTR, AX
    86	INT	$64
    87	CALL	runtime·exitsyscall(SB)
    88	MOVL	sysargs-144(SP), AX
    89	MOVL	AX, errbuf-148(SP)
    90	CALL	runtime·gostring(SB)
    91	LEAL	str-144(SP), SI
    92	JMP	copyresult4
    93
    94ok4:
    95	CALL	runtime·exitsyscall(SB)
    96	LEAL	·emptystring(SB), SI
    97
    98copyresult4:
    99	LEAL	err+36(FP), DI
   100
   101	CLD
   102	MOVSL
   103	MOVSL
   104
   105	RET
   106
   107TEXT ·RawSyscall(SB),NOSPLIT,$0-28
   108	MOVL	trap+0(FP), AX	// syscall entry
   109	// slide args down on top of system call number
   110	LEAL	a1+4(FP), SI
   111	LEAL	trap+0(FP), DI
   112	CLD
   113	MOVSL
   114	MOVSL
   115	MOVSL
   116	INT	$64
   117	MOVL	AX, r1+16(FP)
   118	MOVL	AX, r2+20(FP)
   119	MOVL	AX, err+24(FP)
   120	RET
   121
   122TEXT	·RawSyscall6(SB),NOSPLIT,$0-40
   123	MOVL	trap+0(FP), AX	// syscall entry
   124	// slide args down on top of system call number
   125	LEAL	a1+4(FP), SI
   126	LEAL	trap+0(FP), DI
   127	CLD
   128	MOVSL
   129	MOVSL
   130	MOVSL
   131	MOVSL
   132	MOVSL
   133	MOVSL
   134	INT	$64
   135	MOVL	AX, r1+28(FP)
   136	MOVL	AX, r2+32(FP)
   137	MOVL	AX, err+36(FP)
   138	RET
   139
   140#define SYS_SEEK 39	/* from zsysnum_plan9.go */
   141
   142//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
   143TEXT ·seek(SB),NOSPLIT,$24-36
   144	NO_LOCAL_POINTERS
   145	LEAL	newoffset+20(FP), AX
   146	MOVL	AX, placeholder+0(FP)
   147
   148	// copy args down
   149	LEAL	placeholder+0(FP), SI
   150	LEAL	sysargs-20(SP), DI
   151	CLD
   152	MOVSL
   153	MOVSL
   154	MOVSL
   155	MOVSL
   156	MOVSL
   157	MOVL	$SYS_SEEK, AX	// syscall entry
   158	INT	$64
   159
   160	CMPL	AX, $-1
   161	JNE	ok6
   162	MOVL	AX, newoffset_lo+20(FP)
   163	MOVL	AX, newoffset_hi+24(FP)
   164
   165	CALL	syscall·errstr(SB)
   166	MOVL	SP, SI
   167	JMP	copyresult6
   168
   169ok6:
   170	LEAL	·emptystring(SB), SI
   171
   172copyresult6:
   173	LEAL	err+28(FP), DI
   174
   175	CLD
   176	MOVSL
   177	MOVSL
   178	RET
View as plain text