haraldwolff/qemu-patch-raspberry4
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X86_64: Use proper jumps/calls when displacement exceeds +-2G

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Signed-off-by: malc <av1474@comtv.ru>
This commit is contained in:
malc 2009-09-03 04:20:01 +04:00
parent 3c854e4770
commit abb6ae2c00
1 changed files with 19 additions and 12 deletions
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31
tcg/x86_64/tcg-target.c
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@ -363,6 +363,20 @@ static inline void tcg_out_movi(TCGContext *s, TCGType type,
}
}
static void tcg_out_goto(TCGContext *s, int call, uint8_t *target)
{
int32_t disp;
disp = target - s->code_ptr - 5;
if (disp == (target - s->code_ptr - 5)) {
tcg_out8(s, call ? 0xe8 : 0xe9);
tcg_out32(s, disp);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R10, (tcg_target_long) target);
tcg_out_modrm(s, 0xff, call ? 2 : 4, TCG_REG_R10);
}
}
static inline void tcg_out_ld(TCGContext *s, TCGType type, int ret,
int arg1, tcg_target_long arg2)
{
@ -559,9 +573,7 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args,
/* XXX: move that code at the end of the TB */
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_RSI, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_ld_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_goto(s, 1, qemu_ld_helpers[s_bits]);
switch(opc) {
case 0 | 4:
@ -774,9 +786,7 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
break;
}
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_RDX, mem_index);
tcg_out8(s, 0xe8);
tcg_out32(s, (tcg_target_long)qemu_st_helpers[s_bits] -
(tcg_target_long)s->code_ptr - 4);
tcg_out_goto(s, 1, qemu_st_helpers[s_bits]);
/* jmp label2 */
tcg_out8(s, 0xeb);
@ -865,8 +875,7 @@ static inline void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
switch(opc) {
case INDEX_op_exit_tb:
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RAX, args[0]);
tcg_out8(s, 0xe9); /* jmp tb_ret_addr */
tcg_out32(s, tb_ret_addr - s->code_ptr - 4);
tcg_out_goto(s, 0, tb_ret_addr);
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_offset) {
@ -885,16 +894,14 @@ static inline void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
break;
case INDEX_op_call:
if (const_args[0]) {
tcg_out8(s, 0xe8);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
tcg_out_goto(s, 1, (void *) args[0]);
} else {
tcg_out_modrm(s, 0xff, 2, args[0]);
}
break;
case INDEX_op_jmp:
if (const_args[0]) {
tcg_out8(s, 0xe9);
tcg_out32(s, args[0] - (tcg_target_long)s->code_ptr - 4);
tcg_out_goto(s, 0, (void *) args[0]);
} else {
tcg_out_modrm(s, 0xff, 4, args[0]);
}