| // Copyright 2016 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 crosscall_s390x(void (*fn)(void), void *g) |
| * |
| * Calling into the go tool chain, where all registers are caller save. |
| * Called from standard s390x C ABI, where r6-r13, r15, and f0, f2, f4 and f6 are |
| * callee-save, so they must be saved explicitly. |
| */ |
| .globl crosscall_s390x |
| crosscall_s390x: |
| /* |
| * save r6-r15, f0, f2, f4 and f6 in the |
| * register save area of the calling function |
| */ |
| stmg %r6, %r15, 48(%r15) |
| stdy %f0, 128(%r15) |
| stdy %f2, 136(%r15) |
| stdy %f4, 144(%r15) |
| stdy %f6, 152(%r15) |
| |
| /* set r0 to 0 */ |
| xgr %r0, %r0 |
| |
| /* restore g pointer */ |
| lgr %r13, %r3 |
| |
| /* grow stack 8 bytes and call fn */ |
| agfi %r15, -8 |
| basr %r14, %r2 |
| agfi %r15, 8 |
| |
| /* restore registers */ |
| lmg %r6, %r15, 48(%r15) |
| ldy %f0, 128(%r15) |
| ldy %f2, 136(%r15) |
| ldy %f4, 144(%r15) |
| ldy %f6, 152(%r15) |
| |
| br %r14 /* restored by lmg */ |
| |
| #ifdef __ELF__ |
| .section .note.GNU-stack,"",%progbits |
| #endif |
