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| author | Markos Chandras <markos.chandras@imgtec.com> | 2014-11-26 10:10:18 +0000 |
|---|---|---|
| committer | Markos Chandras <markos.chandras@imgtec.com> | 2015-02-17 15:37:32 +0000 |
| commit | c8a34581ec09a5ee11dd833d6c5cf41fdbef706f (patch) | |
| tree | ae78d1cc82562dfa92bcad4bcc7848343af21dc7 /arch/mips/math-emu | |
| parent | 319824eabc3f1c1aab67f408d66f384fbb996ee2 (diff) | |
| download | linux-c8a34581ec09a5ee11dd833d6c5cf41fdbef706f.tar.bz2 | |
MIPS: Emulate the BC1{EQ,NE}Z FPU instructions
MIPS R6 introduced the following two branch instructions for COP1:
BC1EQZ: Branch if Cop1 (FPR) Register Bit 0 is Equal to Zero
BC1NEZ: Branch if Cop1 (FPR) Register Bit 0 is Not Equal to Zero
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Diffstat (limited to 'arch/mips/math-emu')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 7bbaefe0434d..798204e492fc 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -602,6 +602,33 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, #endif case cop0_op: case cop1_op: + /* Need to check for R6 bc1nez and bc1eqz branches */ + if (cpu_has_mips_r6 && + ((insn.i_format.rs == bc1eqz_op) || + (insn.i_format.rs == bc1nez_op))) { + bit = 0; + switch (insn.i_format.rs) { + case bc1eqz_op: + if (get_fpr32(¤t->thread.fpu.fpr[insn.i_format.rt], 0) & 0x1) + bit = 1; + break; + case bc1nez_op: + if (!(get_fpr32(¤t->thread.fpu.fpr[insn.i_format.rt], 0) & 0x1)) + bit = 1; + break; + } + if (bit) + *contpc = regs->cp0_epc + + dec_insn.pc_inc + + (insn.i_format.simmediate << 2); + else + *contpc = regs->cp0_epc + + dec_insn.pc_inc + + dec_insn.next_pc_inc; + + return 1; + } + /* R2/R6 compatible cop1 instruction. Fall through */ case cop2_op: case cop1x_op: if (insn.i_format.rs == bc_op) { |