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tcg/i386: Generalize multi-part load overlap test

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Test for both base and index; use datahi as a temporary, overwritten
by the final load.  Always perform the loads in ascending order, so
that any (user-only) fault sees the correct address.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-04-16 15:56:41 +02:00
parent bf12e2240d
commit 3174941fe0
1 changed files with 15 additions and 16 deletions
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31
tcg/i386/tcg-target.c.inc
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@ -2221,23 +2221,22 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, TCGReg datalo, TCGReg datahi,
if (TCG_TARGET_REG_BITS == 64) { if (TCG_TARGET_REG_BITS == 64) {
tcg_out_modrm_sib_offset(s, movop + P_REXW + seg, datalo, tcg_out_modrm_sib_offset(s, movop + P_REXW + seg, datalo,
base, index, 0, ofs); base, index, 0, ofs);
break;
}
if (use_movbe) {
TCGReg t = datalo;
datalo = datahi;
datahi = t;
}
if (base == datalo || index == datalo) {
tcg_out_modrm_sib_offset(s, OPC_LEA, datahi, base, index, 0, ofs);
tcg_out_modrm_offset(s, movop + seg, datalo, datahi, 0);
tcg_out_modrm_offset(s, movop + seg, datahi, datahi, 4);
} else { } else {
if (use_movbe) { tcg_out_modrm_sib_offset(s, movop + seg, datalo,
TCGReg t = datalo; base, index, 0, ofs);
datalo = datahi; tcg_out_modrm_sib_offset(s, movop + seg, datahi,
datahi = t; base, index, 0, ofs + 4);
}
if (base != datalo) {
tcg_out_modrm_sib_offset(s, movop + seg, datalo,
base, index, 0, ofs);
tcg_out_modrm_sib_offset(s, movop + seg, datahi,
base, index, 0, ofs + 4);
} else {
tcg_out_modrm_sib_offset(s, movop + seg, datahi,
base, index, 0, ofs + 4);
tcg_out_modrm_sib_offset(s, movop + seg, datalo,
base, index, 0, ofs);
}
} }
break; break;
default: default: