提交 085c648b 编写于 作者: R Richard Henderson

tcg/arm: Implement goto_ptr

Signed-off-by: NRichard Henderson <rth@twiddle.net>
上级 702a9474
......@@ -123,7 +123,7 @@ extern bool use_idiv_instructions;
#define TCG_TARGET_HAS_mulsh_i32 0
#define TCG_TARGET_HAS_div_i32 use_idiv_instructions
#define TCG_TARGET_HAS_rem_i32 0
#define TCG_TARGET_HAS_goto_ptr 0
#define TCG_TARGET_HAS_goto_ptr 1
enum {
TCG_AREG0 = TCG_REG_R6,
......
......@@ -1655,8 +1655,14 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
switch (opc) {
case INDEX_op_exit_tb:
tcg_out_movi32(s, COND_AL, TCG_REG_R0, args[0]);
tcg_out_goto(s, COND_AL, tb_ret_addr);
/* Reuse the zeroing that exists for goto_ptr. */
a0 = args[0];
if (a0 == 0) {
tcg_out_goto(s, COND_AL, s->code_gen_epilogue);
} else {
tcg_out_movi32(s, COND_AL, TCG_REG_R0, args[0]);
tcg_out_goto(s, COND_AL, tb_ret_addr);
}
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_insn_offset) {
......@@ -1671,6 +1677,9 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
}
s->tb_jmp_reset_offset[args[0]] = tcg_current_code_size(s);
break;
case INDEX_op_goto_ptr:
tcg_out_bx(s, COND_AL, args[0]);
break;
case INDEX_op_br:
tcg_out_goto_label(s, COND_AL, arg_label(args[0]));
break;
......@@ -1961,6 +1970,7 @@ static const TCGTargetOpDef arm_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" } },
......@@ -2136,9 +2146,16 @@ static void tcg_target_qemu_prologue(TCGContext *s)
tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
tcg_out_bx(s, COND_AL, tcg_target_call_iarg_regs[1]);
tb_ret_addr = s->code_ptr;
/* Epilogue. We branch here via tb_ret_addr. */
/*
* 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_movi(s, TCG_TYPE_PTR, TCG_REG_R0, 0);
/* TB epilogue */
tb_ret_addr = s->code_ptr;
tcg_out_dat_rI(s, COND_AL, ARITH_ADD, TCG_REG_CALL_STACK,
TCG_REG_CALL_STACK, stack_addend, 1);
......
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