| Brad Fitzpatrick | 5194744 | 2016-03-01 22:57:46 +0000 | [diff] [blame] | 1 | // Copyright 2012 The Go Authors. All rights reserved. |
| Russ Cox | d17506e | 2013-02-28 22:14:55 -0800 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| Russ Cox | e8fc362 | 2014-09-06 15:27:39 -0400 | [diff] [blame] | 5 | #include "textflag.h" |
| Keith Randall | 8b789e1 | 2013-08-12 10:25:36 -0700 | [diff] [blame] | 6 | |
| Ian Lance Taylor | 5f9a870 | 2016-04-27 14:18:29 -0700 | [diff] [blame] | 7 | // Called by C code generated by cmd/cgo. |
| 8 | // func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr) |
| 9 | // Saves C callee-saved registers and calls fn with three arguments. |
| Austin Clements | a046caa | 2018-01-25 12:15:23 -0500 | [diff] [blame] | 10 | TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 |
| Russ Cox | d17506e | 2013-02-28 22:14:55 -0800 | [diff] [blame] | 11 | /* |
| 12 | * We still need to save all callee save register as before, and then |
| Ian Lance Taylor | 5f9a870 | 2016-04-27 14:18:29 -0700 | [diff] [blame] | 13 | * push 3 args for fn (R1, R2, R3). |
| Aaron Jacobs | 8628688 | 2015-06-24 09:50:12 +1000 | [diff] [blame] | 14 | * Also note that at procedure entry in gc world, 4(R13) will be the |
| Russ Cox | d17506e | 2013-02-28 22:14:55 -0800 | [diff] [blame] | 15 | * first arg, so we must push another dummy reg (R0) for 0(R13). |
| Russ Cox | 89f185f | 2014-06-26 11:54:39 -0400 | [diff] [blame] | 16 | * Additionally, runtime·load_g will clobber R0, so we need to save R0 |
| Russ Cox | d17506e | 2013-02-28 22:14:55 -0800 | [diff] [blame] | 17 | * nevertheless. |
| 18 | */ |
| Elias Naur | 72eb46c | 2016-05-16 15:51:07 +0200 | [diff] [blame] | 19 | SUB $(8*9), R13 // Reserve space for the floating point registers. |
| Ian Lance Taylor | 5f9a870 | 2016-04-27 14:18:29 -0700 | [diff] [blame] | 20 | MOVM.WP [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13) |
| Elias Naur | 72eb46c | 2016-05-16 15:51:07 +0200 | [diff] [blame] | 21 | |
| 22 | // Skip floating point registers on GOARM < 6. |
| 23 | MOVB runtime·goarm(SB), R11 |
| 24 | CMP $6, R11 |
| 25 | BLT skipfpsave |
| 26 | MOVD F8, (14*4+8*1)(R13) |
| 27 | MOVD F9, (14*4+8*2)(R13) |
| 28 | MOVD F10, (14*4+8*3)(R13) |
| 29 | MOVD F11, (14*4+8*4)(R13) |
| 30 | MOVD F12, (14*4+8*5)(R13) |
| 31 | MOVD F13, (14*4+8*6)(R13) |
| 32 | MOVD F14, (14*4+8*7)(R13) |
| 33 | MOVD F15, (14*4+8*8)(R13) |
| 34 | |
| 35 | skipfpsave: |
| Russ Cox | 89f185f | 2014-06-26 11:54:39 -0400 | [diff] [blame] | 36 | BL runtime·load_g(SB) |
| Rob Pike | 0f3f2c4 | 2015-02-17 09:49:57 -0800 | [diff] [blame] | 37 | MOVW R15, R14 // R15 is PC. |
| 38 | MOVW 0(R13), R15 |
| Elias Naur | 72eb46c | 2016-05-16 15:51:07 +0200 | [diff] [blame] | 39 | |
| 40 | MOVB runtime·goarm(SB), R11 |
| 41 | CMP $6, R11 |
| 42 | BLT skipfprest |
| 43 | MOVD (14*4+8*1)(R13), F8 |
| 44 | MOVD (14*4+8*2)(R13), F9 |
| 45 | MOVD (14*4+8*3)(R13), F10 |
| 46 | MOVD (14*4+8*4)(R13), F11 |
| 47 | MOVD (14*4+8*5)(R13), F12 |
| 48 | MOVD (14*4+8*6)(R13), F13 |
| 49 | MOVD (14*4+8*7)(R13), F14 |
| 50 | MOVD (14*4+8*8)(R13), F15 |
| 51 | |
| 52 | skipfprest: |
| 53 | MOVM.IAW (R13), [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14] |
| 54 | ADD $(8*9), R13 |
| 55 | MOVW R14, R15 |
