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tcg/s390: Implement goto_ptr

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Backports commit 46644483cae978c734460131bb1d9071f813b287 from qemu
This commit is contained in:
Richard Henderson 2018-03-03 14:16:01 -05:00 committed by Lioncash
parent f0420c3427
commit d496bb6150
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GPG Key ID: 4E3C3CC1031BA9C7
2 changed files with 22 additions and 4 deletions
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2
qemu/tcg/s390/tcg-target.h
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@ -92,7 +92,7 @@ extern uint64_t s390_facilities;
#define TCG_TARGET_HAS_mulsh_i32 0
#define TCG_TARGET_HAS_extrl_i64_i32 0
#define TCG_TARGET_HAS_extrh_i64_i32 0
#define TCG_TARGET_HAS_goto_ptr 0
#define TCG_TARGET_HAS_goto_ptr 1
#define TCG_TARGET_HAS_div2_i64 1
#define TCG_TARGET_HAS_rot_i64 1

24
qemu/tcg/s390/tcg-target.inc.c
View File

@ -1748,9 +1748,14 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
switch (opc) {
case INDEX_op_exit_tb:
/* return value */
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R2, args[0]);
tgen_gotoi(s, S390_CC_ALWAYS, tb_ret_addr);
/* Reuse the zeroing that exists for goto_ptr. */
a0 = args[0];
if (a0 == 0) {
tgen_gotoi(s, S390_CC_ALWAYS, s->code_gen_epilogue);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R2, a0);
tgen_gotoi(s, S390_CC_ALWAYS, tb_ret_addr);
}
break;
case INDEX_op_goto_tb:
@ -1774,6 +1779,10 @@ 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_insn(s, RR, BCR, S390_CC_ALWAYS, args[0]);
break;
OP_32_64(ld8u):
/* ??? LLC (RXY format) is only present with the extended-immediate
facility, whereas LLGC is always present. */
@ -2248,6 +2257,7 @@ static const TCGTargetOpDef s390_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" } },
@ -2446,6 +2456,14 @@ static void tcg_target_qemu_prologue(TCGContext *s)
/* br %r3 (go to TB) */
tcg_out_insn(s, RR, BCR, S390_CC_ALWAYS, tcg_target_call_iarg_regs[1]);
/*
* 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_R2, 0);
/* TB epilogue */
tb_ret_addr = s->code_ptr;
/* lmg %r6,%r15,fs+48(%r15) (restore registers) */