From 5cb4ef80f65252dd85b86fa7f3c985015423d670 Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Wed, 26 Apr 2017 23:29:18 -0400 Subject: tcg/i386: implement goto_ptr Suggested-by: Richard Henderson Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Message-Id: <1493263764-18657-6-git-send-email-cota@braap.org> [rth: Reuse goto_ptr epilogue for exit_tb 0.] Signed-off-by: Richard Henderson --- tcg/i386/tcg-target.inc.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) (limited to 'tcg/i386/tcg-target.inc.c') diff --git a/tcg/i386/tcg-target.inc.c b/tcg/i386/tcg-target.inc.c index 5918008296..01e3b4e95c 100644 --- a/tcg/i386/tcg-target.inc.c +++ b/tcg/i386/tcg-target.inc.c @@ -1882,8 +1882,13 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, switch (opc) { case INDEX_op_exit_tb: - tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_EAX, a0); - tcg_out_jmp(s, tb_ret_addr); + /* Reuse the zeroing that exists for goto_ptr. */ + if (a0 == 0) { + tcg_out_jmp(s, s->code_gen_epilogue); + } else { + tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_EAX, a0); + tcg_out_jmp(s, tb_ret_addr); + } break; case INDEX_op_goto_tb: if (s->tb_jmp_insn_offset) { @@ -1906,6 +1911,10 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, } 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_modrm(s, OPC_GRP5, EXT5_JMPN_Ev, a0); + break; case INDEX_op_br: tcg_out_jxx(s, JCC_JMP, arg_label(a0), 0); break; @@ -2277,6 +2286,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op) { + static const TCGTargetOpDef r = { .args_ct_str = { "r" } }; static const TCGTargetOpDef ri_r = { .args_ct_str = { "ri", "r" } }; static const TCGTargetOpDef re_r = { .args_ct_str = { "re", "r" } }; static const TCGTargetOpDef qi_r = { .args_ct_str = { "qi", "r" } }; @@ -2299,6 +2309,9 @@ static const TCGTargetOpDef *tcg_target_op_def(TCGOpcode op) = { .args_ct_str = { "L", "L", "L", "L" } }; switch (op) { + case INDEX_op_goto_ptr: + return &r; + case INDEX_op_ld8u_i32: case INDEX_op_ld8u_i64: case INDEX_op_ld8s_i32: @@ -2567,6 +2580,13 @@ static void tcg_target_qemu_prologue(TCGContext *s) tcg_out_modrm(s, OPC_GRP5, EXT5_JMPN_Ev, tcg_target_call_iarg_regs[1]); #endif + /* + * 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_REG, TCG_REG_EAX, 0); + /* TB epilogue */ tb_ret_addr = s->code_ptr; -- cgit v1.2.1