| // Copyright 2020 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. |
| |
| /* |
| * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g) |
| * |
| * Calling into the gc tool chain, where all registers are caller save. |
| * Called from standard RISCV ELF psABI, where x8-x9, x18-x27, f8-f9 and |
| * f18-f27 are callee-save, so they must be saved explicitly, along with |
| * x1 (LR). |
| */ |
| .globl crosscall1 |
| crosscall1: |
| sd x1, -200(sp) |
| addi sp, sp, -200 |
| sd x8, 8(sp) |
| sd x9, 16(sp) |
| sd x18, 24(sp) |
| sd x19, 32(sp) |
| sd x20, 40(sp) |
| sd x21, 48(sp) |
| sd x22, 56(sp) |
| sd x23, 64(sp) |
| sd x24, 72(sp) |
| sd x25, 80(sp) |
| sd x26, 88(sp) |
| sd x27, 96(sp) |
| fsd f8, 104(sp) |
| fsd f9, 112(sp) |
| fsd f18, 120(sp) |
| fsd f19, 128(sp) |
| fsd f20, 136(sp) |
| fsd f21, 144(sp) |
| fsd f22, 152(sp) |
| fsd f23, 160(sp) |
| fsd f24, 168(sp) |
| fsd f25, 176(sp) |
| fsd f26, 184(sp) |
| fsd f27, 192(sp) |
| |
| // a0 = *fn, a1 = *setg_gcc, a2 = *g |
| mv s1, a0 |
| mv s0, a1 |
| mv a0, a2 |
| jalr ra, s0 // call setg_gcc (clobbers x30 aka g) |
| jalr ra, s1 // call fn |
| |
| ld x1, 0(sp) |
| ld x8, 8(sp) |
| ld x9, 16(sp) |
| ld x18, 24(sp) |
| ld x19, 32(sp) |
| ld x20, 40(sp) |
| ld x21, 48(sp) |
| ld x22, 56(sp) |
| ld x23, 64(sp) |
| ld x24, 72(sp) |
| ld x25, 80(sp) |
| ld x26, 88(sp) |
| ld x27, 96(sp) |
| fld f8, 104(sp) |
| fld f9, 112(sp) |
| fld f18, 120(sp) |
| fld f19, 128(sp) |
| fld f20, 136(sp) |
| fld f21, 144(sp) |
| fld f22, 152(sp) |
| fld f23, 160(sp) |
| fld f24, 168(sp) |
| fld f25, 176(sp) |
| fld f26, 184(sp) |
| fld f27, 192(sp) |
| addi sp, sp, 200 |
| |
| jr ra |
| |
| #ifdef __ELF__ |
| .section .note.GNU-stack,"",%progbits |
| #endif |
