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| author | Wayne Zuo <wdvxdr@golangcn.org> | 2022-10-17 23:01:13 +0800 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2022-10-26 05:51:33 +0000 |
| commit | 939f9fd64a740ef770a0ca3588f8c193dceebe83 (patch) | |
| tree | ceabde1e60f4f17637e5980526fee1fe4901f8b6 /src/runtime/internal/syscall | |
| parent | d2901205c15d5d839c95988497c190b652c5cf3a (diff) | |
| download | go-939f9fd64a740ef770a0ca3588f8c193dceebe83.tar.xz | |
runtime/internal/syscall: use ABIInternal for Syscall6 on riscv64
Change-Id: Iceed0f55038c87f261b60309e025132142946364
Reviewed-on: https://go-review.googlesource.com/c/go/+/443557
Run-TryBot: Wayne Zuo <wdvxdr@golangcn.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Wayne Zuo <wdvxdr@golangcn.org>
Diffstat (limited to 'src/runtime/internal/syscall')
| -rw-r--r-- | src/runtime/internal/syscall/asm_linux_riscv64.s | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/src/runtime/internal/syscall/asm_linux_riscv64.s b/src/runtime/internal/syscall/asm_linux_riscv64.s index a8652fdd6b..15e50ec153 100644 --- a/src/runtime/internal/syscall/asm_linux_riscv64.s +++ b/src/runtime/internal/syscall/asm_linux_riscv64.s @@ -5,25 +5,39 @@ #include "textflag.h" // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr) -TEXT ·Syscall6(SB),NOSPLIT,$0-80 - MOV num+0(FP), A7 // syscall entry - MOV a1+8(FP), A0 - MOV a2+16(FP), A1 - MOV a3+24(FP), A2 - MOV a4+32(FP), A3 - MOV a5+40(FP), A4 - MOV a6+48(FP), A5 +// +// We need to convert to the syscall ABI. +// +// arg | ABIInternal | Syscall +// --------------------------- +// num | A0 | A7 +// a1 | A1 | A0 +// a2 | A2 | A1 +// a3 | A3 | A2 +// a4 | A4 | A3 +// a5 | A5 | A4 +// a6 | A6 | A5 +// +// r1 | A0 | A0 +// r2 | A1 | A1 +// err | A2 | part of A0 +TEXT ·Syscall6<ABIInternal>(SB),NOSPLIT,$0-80 + MOV A0, A7 + MOV A1, A0 + MOV A2, A1 + MOV A3, A2 + MOV A4, A3 + MOV A5, A4 + MOV A6, A5 ECALL MOV $-4096, T0 BLTU T0, A0, err - MOV A0, r1+56(FP) - MOV A1, r2+64(FP) - MOV ZERO, errno+72(FP) + // r1 already in A0 + // r2 already in A1 + MOV ZERO, A2 // errno RET err: - MOV $-1, T0 - MOV T0, r1+56(FP) - MOV ZERO, r2+64(FP) - SUB A0, ZERO, A0 - MOV A0, errno+72(FP) + SUB A0, ZERO, A2 // errno + MOV $-1, A0 // r1 + MOV ZERO, A1 // r2 RET |