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Diffstat (limited to '')
| -rw-r--r-- | src/runtime/rt0_freebsd_riscv64.s | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/runtime/rt0_freebsd_riscv64.s b/src/runtime/rt0_freebsd_riscv64.s new file mode 100644 index 0000000..dc46b70 --- /dev/null +++ b/src/runtime/rt0_freebsd_riscv64.s @@ -0,0 +1,112 @@ +// Copyright 2022 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. + +#include "textflag.h" + +// On FreeBSD argc/argv are passed in R0, not X2 +TEXT _rt0_riscv64_freebsd(SB),NOSPLIT|NOFRAME,$0 + ADD $8, A0, A1 // argv + MOV 0(A0), A0 // argc + JMP main(SB) + +// When building with -buildmode=c-shared, this symbol is called when the shared +// library is loaded. +TEXT _rt0_riscv64_freebsd_lib(SB),NOSPLIT,$224 + // Preserve callee-save registers, along with X1 (LR). + MOV X1, (8*3)(X2) + MOV X8, (8*4)(X2) + MOV X9, (8*5)(X2) + MOV X18, (8*6)(X2) + MOV X19, (8*7)(X2) + MOV X20, (8*8)(X2) + MOV X21, (8*9)(X2) + MOV X22, (8*10)(X2) + MOV X23, (8*11)(X2) + MOV X24, (8*12)(X2) + MOV X25, (8*13)(X2) + MOV X26, (8*14)(X2) + MOV g, (8*15)(X2) + MOVD F8, (8*16)(X2) + MOVD F9, (8*17)(X2) + MOVD F18, (8*18)(X2) + MOVD F19, (8*19)(X2) + MOVD F20, (8*20)(X2) + MOVD F21, (8*21)(X2) + MOVD F22, (8*22)(X2) + MOVD F23, (8*23)(X2) + MOVD F24, (8*24)(X2) + MOVD F25, (8*25)(X2) + MOVD F26, (8*26)(X2) + MOVD F27, (8*27)(X2) + + // Initialize g as nil in case of using g later e.g. sigaction in cgo_sigaction.go + MOV X0, g + + MOV A0, _rt0_riscv64_freebsd_lib_argc<>(SB) + MOV A1, _rt0_riscv64_freebsd_lib_argv<>(SB) + + // Synchronous initialization. + MOV $runtime·libpreinit(SB), T0 + JALR RA, T0 + + // Create a new thread to do the runtime initialization and return. + MOV _cgo_sys_thread_create(SB), T0 + BEQZ T0, nocgo + MOV $_rt0_riscv64_freebsd_lib_go(SB), A0 + MOV $0, A1 + JALR RA, T0 + JMP restore + +nocgo: + MOV $0x800000, A0 // stacksize = 8192KB + MOV $_rt0_riscv64_freebsd_lib_go(SB), A1 + MOV A0, 8(X2) + MOV A1, 16(X2) + MOV $runtime·newosproc0(SB), T0 + JALR RA, T0 + +restore: + // Restore callee-save registers, along with X1 (LR). + MOV (8*3)(X2), X1 + MOV (8*4)(X2), X8 + MOV (8*5)(X2), X9 + MOV (8*6)(X2), X18 + MOV (8*7)(X2), X19 + MOV (8*8)(X2), X20 + MOV (8*9)(X2), X21 + MOV (8*10)(X2), X22 + MOV (8*11)(X2), X23 + MOV (8*12)(X2), X24 + MOV (8*13)(X2), X25 + MOV (8*14)(X2), X26 + MOV (8*15)(X2), g + MOVD (8*16)(X2), F8 + MOVD (8*17)(X2), F9 + MOVD (8*18)(X2), F18 + MOVD (8*19)(X2), F19 + MOVD (8*20)(X2), F20 + MOVD (8*21)(X2), F21 + MOVD (8*22)(X2), F22 + MOVD (8*23)(X2), F23 + MOVD (8*24)(X2), F24 + MOVD (8*25)(X2), F25 + MOVD (8*26)(X2), F26 + MOVD (8*27)(X2), F27 + + RET + +TEXT _rt0_riscv64_freebsd_lib_go(SB),NOSPLIT,$0 + MOV _rt0_riscv64_freebsd_lib_argc<>(SB), A0 + MOV _rt0_riscv64_freebsd_lib_argv<>(SB), A1 + MOV $runtime·rt0_go(SB), T0 + JALR ZERO, T0 + +DATA _rt0_riscv64_freebsd_lib_argc<>(SB)/8, $0 +GLOBL _rt0_riscv64_freebsd_lib_argc<>(SB),NOPTR, $8 +DATA _rt0_riscv64_freebsd_lib_argv<>(SB)/8, $0 +GLOBL _rt0_riscv64_freebsd_lib_argv<>(SB),NOPTR, $8 + +TEXT main(SB),NOSPLIT|NOFRAME,$0 + MOV $runtime·rt0_go(SB), T0 + JALR ZERO, T0 |