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tcg/s390: fix branch target change during code retranslation

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Make sure to not modify the branch target. This ensure that the
branch target is not corrupted during partial retranslation.

Backports commit cd3b29b745b0ff393b2d37317837bc726b8dacc8 from qemu
This commit is contained in:
Aurelien Jarno 2018-02-14 08:52:46 -05:00 committed by Lioncash
parent fa2b872b0b
commit ba73fd9162
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 8 additions and 4 deletions
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12
qemu/tcg/s390/tcg-target.c
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@ -1659,8 +1659,10 @@ static void tcg_out_qemu_ld(TCGContext* s, TCGReg data_reg, TCGReg addr_reg,
base_reg = tcg_out_tlb_read(s, addr_reg, opc, mem_index, 1);
label_ptr = s->code_ptr + 1;
tcg_out_insn(s, RI, BRC, S390_CC_NE, 0);
/* We need to keep the offset unchanged for retranslation. */
tcg_out16(s, RI_BRC | (S390_CC_NE << 4));
label_ptr = s->code_ptr;
s->code_ptr += 1;
tcg_out_qemu_ld_direct(s, opc, data_reg, base_reg, TCG_REG_R2, 0);
@ -1685,8 +1687,10 @@ static void tcg_out_qemu_st(TCGContext* s, TCGReg data_reg, TCGReg addr_reg,
base_reg = tcg_out_tlb_read(s, addr_reg, opc, mem_index, 0);
label_ptr = s->code_ptr + 1;
tcg_out_insn(s, RI, BRC, S390_CC_NE, 0);
/* We need to keep the offset unchanged for retranslation. */
tcg_out16(s, RI_BRC | (S390_CC_NE << 4));
label_ptr = s->code_ptr;
s->code_ptr += 1;
tcg_out_qemu_st_direct(s, opc, data_reg, base_reg, TCG_REG_R2, 0);