mirror of
https://github.com/golang/go
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121 lines
2.3 KiB
ArmAsm
121 lines
2.3 KiB
ArmAsm
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//
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// System calls for 386, Native Client
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//
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#define SYSCALL(x) $(0x10000+x * 32)
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// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
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// Trap # in AX, args in BX CX DX SI DI, return in AX
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TEXT syscall·Syscall(SB),7,$20
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CALL sys·entersyscall(SB)
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MOVL trap+0(FP), AX // syscall entry
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MOVL a1+4(FP), BX
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MOVL a2+8(FP), CX
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MOVL a3+12(FP), DX
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MOVL $0, SI
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MOVL $0, DI
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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MOVL SI, 12(SP)
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MOVL DI, 16(SP)
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// Call $(0x10000+32*AX)
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SHLL $5, AX
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ADDL $0x10000, AX
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CALL AX
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CMPL AX, $0xfffff001
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JLS ok
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MOVL $-1, 20(SP) // r1
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MOVL $0, 24(SP) // r2
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NEGL AX
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MOVL AX, 28(SP) // errno
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CALL sys·exitsyscall(SB)
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RET
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ok:
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MOVL AX, 20(SP) // r1
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MOVL DX, 24(SP) // r2
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MOVL $0, 28(SP) // errno
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CALL sys·exitsyscall(SB)
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RET
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// func Syscall6(trap uintptr, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
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// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
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TEXT syscall·Syscall6(SB),7,$20
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CALL sys·entersyscall(SB)
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MOVL trap+0(FP), AX // syscall entry
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MOVL a1+4(FP), BX
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MOVL a2+8(FP), CX
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MOVL a3+12(FP), DX
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MOVL a4+16(FP), SI
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MOVL a5+20(FP), DI
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// a6+24(FP) is ignored
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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MOVL SI, 12(SP)
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MOVL DI, 16(SP)
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// Call $(0x10000+32*AX)
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SHLL $5, AX
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ADDL $0x10000, AX
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CALL AX
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CMPL AX, $0xfffff001
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JLS ok6
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MOVL $-1, 32(SP) // r1
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MOVL $0, 36(SP) // r2
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NEGL AX
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MOVL AX, 40(SP) // errno
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CALL sys·exitsyscall(SB)
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RET
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ok6:
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MOVL AX, 32(SP) // r1
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MOVL DX, 36(SP) // r2
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MOVL $0, 40(SP) // errno
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CALL sys·exitsyscall(SB)
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RET
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// func RawSyscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr);
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TEXT syscall·RawSyscall(SB),7,$0
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TEXT syscall·Syscall(SB),7,$20
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MOVL trap+0(FP), AX // syscall entry
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MOVL a1+4(FP), BX
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MOVL a2+8(FP), CX
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MOVL a3+12(FP), DX
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MOVL $0, SI
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MOVL $0, DI
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MOVL BX, 0(SP)
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MOVL CX, 4(SP)
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MOVL DX, 8(SP)
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MOVL SI, 12(SP)
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MOVL DI, 16(SP)
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// Call $(0x10000+32*AX)
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SHLL $5, AX
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ADDL $0x10000, AX
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CALL AX
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CMPL AX, $0xfffff001
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JLS ok1
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MOVL $-1, 20(SP) // r1
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MOVL $0, 24(SP) // r2
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NEGL AX
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MOVL AX, 28(SP) // errno
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RET
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ok1:
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MOVL AX, 20(SP) // r1
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MOVL DX, 24(SP) // r2
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MOVL $0, 28(SP) // errno
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RET
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