| Torne (Richard Coles) | 9e12abd | 2014-08-28 12:05:47 +0100 | [diff] [blame^] | 1 | // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | /* |
| 6 | * typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*); |
| 7 | * extern "C" void pushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback) |
| 8 | */ |
| 9 | |
| 10 | .type pushAllRegisters, %function |
| 11 | .global pushAllRegisters |
| 12 | .hidden pushAllRegisters |
| 13 | pushAllRegisters: |
| 14 | // Push all callee-saves registers to get them |
| 15 | // on the stack for conservative stack scanning. |
| 16 | // Reserve space for callee-saved registers and return address. |
| 17 | daddiu $sp,$sp,-80 |
| 18 | // Save the callee-saved registers and the return address. |
| 19 | sd $s0,0($sp) |
| 20 | sd $s1,8($sp) |
| 21 | sd $s2,16($sp) |
| 22 | sd $s3,24($sp) |
| 23 | sd $s4,32($sp) |
| 24 | sd $s5,40($sp) |
| 25 | sd $s6,48($sp) |
| 26 | sd $s7,56($sp) |
| 27 | sd $ra,64($sp) |
| 28 | // Note: the callee-saved floating point registers do not need to be |
| 29 | // copied to the stack, because fp registers never hold heap pointers |
| 30 | // and so do not need to be kept visible to the garbage collector. |
| 31 | // Pass the two first arguments untouched in a0 and a1 and the |
| 32 | // stack pointer to the callback. |
| 33 | move $t9,$a2 |
| 34 | move $a2,$sp |
| 35 | jal $t9 |
| 36 | // Restore return address, adjust stack and return. |
| 37 | // Note: the copied registers do not need to be reloaded here, |
| 38 | // because they were preserved by the called routine. |
| 39 | ld $ra,64($sp) |
| 40 | daddiu $sp,$sp,80 |
| 41 | jr $ra |