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tcg/mips: Support r6 JR encoding

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MIPSr6 encodes JR as JALR with zero as the link register, and the pre-r6
JR encoding is removed. Update TCG to use the new encoding when built
for r6.

We still use the old encoding for pre-r6, so as not to confuse return
prediction stack hardware which may detect only particular encodings of
the return instruction.

Backports commit 6e0d096989be52c2b945fc83a9bd15d887bbdb47 from qemu
This commit is contained in:
James Hogan 2018-02-16 15:48:00 -05:00 committed by Lioncash
parent 7f1bc28513
commit 9dac598855
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 1 deletions
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5
qemu/tcg/mips/tcg-target.c
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@ -288,7 +288,7 @@ typedef enum {
OPC_SRLV = OPC_SPECIAL | 0x06,
OPC_ROTRV = OPC_SPECIAL | (0x01 << 6) | 0x06,
OPC_SRAV = OPC_SPECIAL | 0x07,
OPC_JR = OPC_SPECIAL | 0x08,
OPC_JR_R5 = OPC_SPECIAL | 0x08,
OPC_JALR = OPC_SPECIAL | 0x09,
OPC_MOVZ = OPC_SPECIAL | 0x0A,
OPC_MOVN = OPC_SPECIAL | 0x0B,
@ -320,6 +320,9 @@ typedef enum {
OPC_WSBH = OPC_SPECIAL3 | 0x0a0,
OPC_SEB = OPC_SPECIAL3 | 0x420,
OPC_SEH = OPC_SPECIAL3 | 0x620,
/* MIPS r6 doesn't have JR, JALR should be used instead */
OPC_JR = use_mips32r6_instructions ? OPC_JALR : OPC_JR_R5,
} MIPSInsn;
/*