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 42
