| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /* |
| * typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*); |
| * extern "C" void pushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback) |
| */ |
| |
| .type pushAllRegisters, %function |
| .global pushAllRegisters |
| .hidden pushAllRegisters |
| pushAllRegisters: |
| // Push all callee-saves registers to get them |
| // on the stack for conservative stack scanning. |
| // Reserve space for callee-saved registers and return address. |
| daddiu $sp,$sp,-80 |
| // Save the callee-saved registers and the return address. |
| sd $s0,0($sp) |
| sd $s1,8($sp) |
| sd $s2,16($sp) |
| sd $s3,24($sp) |
| sd $s4,32($sp) |
| sd $s5,40($sp) |
| sd $s6,48($sp) |
| sd $s7,56($sp) |
| sd $ra,64($sp) |
| // Note: the callee-saved floating point registers do not need to be |
| // copied to the stack, because fp registers never hold heap pointers |
| // and so do not need to be kept visible to the garbage collector. |
| // Pass the two first arguments untouched in a0 and a1 and the |
| // stack pointer to the callback. |
| move $t9,$a2 |
| move $a2,$sp |
| jal $t9 |
| // Restore return address, adjust stack and return. |
| // Note: the copied registers do not need to be reloaded here, |
| // because they were preserved by the called routine. |
| ld $ra,64($sp) |
| daddiu $sp,$sp,80 |
| jr $ra |