| // 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. | |
| // | |
| // System calls for AMD64, Linux | |
| // | |
| // func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64); | |
| // Trap # in AX, args in DI SI DX R10 R8 R9, return in AX DX | |
| // Note that this differs from "standard" ABI convention, which | |
| // would pass 4th arg in CX, not R10. | |
| TEXT syscall·Syscall(SB),7,$-8 | |
| MOVQ 16(SP), DI | |
| MOVQ 24(SP), SI | |
| MOVQ 32(SP), DX | |
| MOVQ 8(SP), AX // syscall entry | |
| SYSCALL | |
| CMPQ AX, $0xfffffffffffff001 | |
| JLS 6(PC) | |
| MOVQ $-1, 40(SP) // r1 | |
| MOVQ $0, 48(SP) // r2 | |
| NEGQ AX | |
| MOVQ AX, 56(SP) // errno | |
| RET | |
| MOVQ AX, 40(SP) // r1 | |
| MOVQ DX, 48(SP) // r2 | |
| MOVQ $0, 56(SP) // errno | |
| RET | |
| // conversion operators - really just casts | |
| TEXT syscall·AddrToInt(SB),7,$-8 | |
| MOVQ 8(SP), AX | |
| MOVQ AX, 16(SP) | |
| RET | |
| TEXT syscall·Addr32ToInt(SB),7,$-8 | |
| MOVQ 8(SP), AX | |
| MOVQ AX, 16(SP) | |
| RET | |
| TEXT syscall·StatToInt(SB),7,$-8 | |
| MOVQ 8(SP), AX | |
| MOVQ AX, 16(SP) | |
| RET |