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tcg/mips: implement goto_ptr

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Backports commit 5786e0683c4f8170dd05a550814b8809d8ae6d86 from qemu
This commit is contained in:
Aurelien Jarno 2018-03-03 14:19:41 -05:00 committed by Lioncash
parent 1d6c4f1a42
commit 0e9d3d1943
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 14 additions and 1 deletions
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2
qemu/tcg/mips/tcg-target.h
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@ -130,7 +130,7 @@ extern bool use_mips32r2_instructions;
#define TCG_TARGET_HAS_muluh_i32 1
#define TCG_TARGET_HAS_mulsh_i32 1
#define TCG_TARGET_HAS_bswap32_i32 1
#define TCG_TARGET_HAS_goto_ptr 0
#define TCG_TARGET_HAS_goto_ptr 1
#if TCG_TARGET_REG_BITS == 64
#define TCG_TARGET_HAS_add2_i32 0

13
qemu/tcg/mips/tcg-target.inc.c
View file

@ -1761,6 +1761,11 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
tcg_out_nop(s);
s->tb_jmp_reset_offset[a0] = tcg_current_code_size(s);
break;
case INDEX_op_goto_ptr:
/* jmp to the given host address (could be epilogue) */
tcg_out_opc_reg(s, OPC_JR, 0, a0, 0);
tcg_out_nop(s);
break;
case INDEX_op_br:
tcg_out_brcond(s, TCG_COND_EQ, TCG_REG_ZERO, TCG_REG_ZERO,
arg_label(s, a0));
@ -2175,6 +2180,7 @@ static const TCGTargetOpDef mips_op_defs[] = {
{ INDEX_op_exit_tb, { } },
{ INDEX_op_goto_tb, { } },
{ INDEX_op_br, { } },
{ INDEX_op_goto_ptr, { "r" } },
{ INDEX_op_ld8u_i32, { "r", "r" } },
{ INDEX_op_ld8s_i32, { "r", "r" } },
@ -2466,6 +2472,13 @@ static void tcg_target_qemu_prologue(TCGContext *s)
/* delay slot */
tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
/*
* Return path for goto_ptr. Set return value to 0, a-la exit_tb,
* and fall through to the rest of the epilogue.
*/
s->code_gen_epilogue = s->code_ptr;
tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_V0, TCG_REG_ZERO);
/* TB epilogue */
tb_ret_addr = s->code_ptr;
for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {