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m68k: fix subx mem, mem instruction

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This patch fixes decrement of the pointers for subx mem, mem instructions.
Without the patch pointers are decremented by OS_* constant value instead of
retrieving the corresponding data size and using it as a decrement.

Backports commit 355d4d1c00e708907ff391c24ca708f1c9c06bf0 from qemu
This commit is contained in:
Pavel Dovgalyuk 2018-05-01 11:39:46 -04:00 committed by Lioncash
parent d3e7bbffea
commit bf16c6daee
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 2 deletions
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4
qemu/target/m68k/translate.c
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@ -3279,11 +3279,11 @@ DISAS_INSN(subx_mem)
opsize = insn_opsize(insn);
addr_src = AREG(insn, 0);
tcg_gen_subi_i32(tcg_ctx, addr_src, addr_src, opsize);
tcg_gen_subi_i32(tcg_ctx, addr_src, addr_src, opsize_bytes(opsize));
src = gen_load(s, opsize, addr_src, 1, IS_USER(s));
addr_dest = AREG(insn, 9);
tcg_gen_subi_i32(tcg_ctx, addr_dest, addr_dest, opsize);
tcg_gen_subi_i32(tcg_ctx, addr_dest, addr_dest, opsize_bytes(opsize));
dest = gen_load(s, opsize, addr_dest, 1, IS_USER(s));
gen_subx(s, src, dest, opsize);