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target/mips: Fix MIPS64 MFC0 UserLocal on BE host

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Using MFC0 to read CP0_UserLocal uses tcg_gen_ld32s_tl, however
CP0_UserLocal is a target_ulong. On a big endian host with a MIPS64
target this reads and sign extends the more significant half of the
64-bit register.

Fix this by using ld_tl to load the whole target_ulong and ext32s_tl to
sign extend it, as done for various other target_ulong COP0 registers.

Backports commit e40df9a80bb7cdb0a4ca650985fa9fe572097fa7 from qemu
This commit is contained in:
James Hogan 2018-03-03 23:37:35 -05:00 committed by Lioncash
parent 32b3c3815d
commit fe0de45a26
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GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 3 additions and 2 deletions
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qemu/target/mips/translate.c
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@ -5219,8 +5219,9 @@ static void gen_mfc0(DisasContext *ctx, TCGv arg, int reg, int sel)
goto cp0_unimplemented;
case 2:
CP0_CHECK(ctx->ulri);
tcg_gen_ld32s_tl(tcg_ctx, arg, tcg_ctx->cpu_env,
offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
tcg_gen_ld_tl(tcg_ctx, arg, tcg_ctx->cpu_env,
offsetof(CPUMIPSState, active_tc.CP0_UserLocal));
tcg_gen_ext32s_tl(tcg_ctx, arg, arg);
rn = "UserLocal";
break;
default: