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- // Copyright 2009 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- // TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
- // so that go vet can check that they are correct.
- #include "textflag.h"
- //
- // System call support for AMD64, FreeBSD
- //
- // The SYSCALL variant for invoking system calls is broken in FreeBSD.
- // See comment at top of ../runtime/sys_freebsd_amd64.c and
- // golang.org/issue/6372.
- #define SYSCALL MOVQ R10, CX; INT $0x80
- // func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
- // func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64);
- // func Syscall9(trap int64, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int64)
- // Trap # in AX, args in DI SI DX, return in AX DX
- TEXT ·Syscall(SB),NOSPLIT,$0-56
- CALL runtime·entersyscall(SB)
- MOVQ 16(SP), DI
- MOVQ 24(SP), SI
- MOVQ 32(SP), DX
- MOVQ $0, R10
- MOVQ $0, R8
- MOVQ $0, R9
- MOVQ 8(SP), AX // syscall entry
- SYSCALL
- JCC ok
- MOVQ $-1, 40(SP) // r1
- MOVQ $0, 48(SP) // r2
- MOVQ AX, 56(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- ok:
- MOVQ AX, 40(SP) // r1
- MOVQ DX, 48(SP) // r2
- MOVQ $0, 56(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- TEXT ·Syscall6(SB),NOSPLIT,$0-80
- CALL runtime·entersyscall(SB)
- MOVQ 16(SP), DI
- MOVQ 24(SP), SI
- MOVQ 32(SP), DX
- MOVQ 40(SP), R10
- MOVQ 48(SP), R8
- MOVQ 56(SP), R9
- MOVQ 8(SP), AX // syscall entry
- SYSCALL
- JCC ok6
- MOVQ $-1, 64(SP) // r1
- MOVQ $0, 72(SP) // r2
- MOVQ AX, 80(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- ok6:
- MOVQ AX, 64(SP) // r1
- MOVQ DX, 72(SP) // r2
- MOVQ $0, 80(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- TEXT ·Syscall9(SB),NOSPLIT,$0-104
- CALL runtime·entersyscall(SB)
- MOVQ 8(SP), AX
- MOVQ 16(SP), DI
- MOVQ 24(SP), SI
- MOVQ 32(SP), DX
- MOVQ 40(SP), R10
- MOVQ 48(SP), R8
- MOVQ 56(SP), R9
- // shift around the last three arguments so they're at the
- // top of the stack when the syscall is called.
- MOVQ 64(SP), R11 // arg 7
- MOVQ R11, 8(SP)
- MOVQ 72(SP), R11 // arg 8
- MOVQ R11, 16(SP)
- MOVQ 80(SP), R11 // arg 9
- MOVQ R11, 24(SP)
- SYSCALL
- JCC ok9
- MOVQ $-1, 88(SP) // r1
- MOVQ $0, 96(SP) // r2
- MOVQ AX, 104(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- ok9:
- MOVQ AX, 88(SP) // r1
- MOVQ DX, 96(SP) // r2
- MOVQ $0, 104(SP) // errno
- CALL runtime·exitsyscall(SB)
- RET
- TEXT ·RawSyscall(SB),NOSPLIT,$0-56
- MOVQ 16(SP), DI
- MOVQ 24(SP), SI
- MOVQ 32(SP), DX
- MOVQ $0, R10
- MOVQ $0, R8
- MOVQ $0, R9
- MOVQ 8(SP), AX // syscall entry
- SYSCALL
- JCC ok1
- MOVQ $-1, 40(SP) // r1
- MOVQ $0, 48(SP) // r2
- MOVQ AX, 56(SP) // errno
- RET
- ok1:
- MOVQ AX, 40(SP) // r1
- MOVQ DX, 48(SP) // r2
- MOVQ $0, 56(SP) // errno
- RET
- TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
- MOVQ 16(SP), DI
- MOVQ 24(SP), SI
- MOVQ 32(SP), DX
- MOVQ 40(SP), R10
- MOVQ 48(SP), R8
- MOVQ 56(SP), R9
- MOVQ 8(SP), AX // syscall entry
- SYSCALL
- JCC ok2
- MOVQ $-1, 64(SP) // r1
- MOVQ $0, 72(SP) // r2
- MOVQ AX, 80(SP) // errno
- RET
- ok2:
- MOVQ AX, 64(SP) // r1
- MOVQ DX, 72(SP) // r2
- MOVQ $0, 80(SP) // errno
- RET
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