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| author | Markos Chandras <markos.chandras@imgtec.com> | 2014-11-27 10:32:25 +0100 |
|---|---|---|
| committer | Markos Chandras <markos.chandras@imgtec.com> | 2015-02-17 16:37:35 +0100 |
| commit | 69b9a2fd05a308b9b1e1f282f3b772491603c582 (patch) | |
| tree | 15a949df838007dfa51396b0286e7e7547f072f3 | |
| parent | MIPS: Emulate the new MIPS R6 BALC instruction (diff) | |
| download | linux-69b9a2fd05a308b9b1e1f282f3b772491603c582.tar.xz linux-69b9a2fd05a308b9b1e1f282f3b772491603c582.zip | |
MIPS: Emulate the new MIPS R6 BEQZC and JIC instructions
MIPS R6 uses the <R6 ldc2 opcode for the new BEQZC and JIC instructions
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
| -rw-r--r-- | arch/mips/include/uapi/asm/inst.h | 2 | ||||
| -rw-r--r-- | arch/mips/kernel/branch.c | 8 | ||||
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 7 |
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/mips/include/uapi/asm/inst.h b/arch/mips/include/uapi/asm/inst.h index 32063c52f24b..721f8fe705a4 100644 --- a/arch/mips/include/uapi/asm/inst.h +++ b/arch/mips/include/uapi/asm/inst.h @@ -32,7 +32,7 @@ enum major_op { sb_op, sh_op, swl_op, sw_op, sdl_op, sdr_op, swr_op, cache_op, ll_op, lwc1_op, lwc2_op, bc6_op = lwc2_op, pref_op, - lld_op, ldc1_op, ldc2_op, ld_op, + lld_op, ldc1_op, ldc2_op, beqzcjic_op = ldc2_op, ld_op, sc_op, swc1_op, swc2_op, balc6_op = swc2_op, major_3b_op, scd_op, sdc1_op, sdc2_op, sd_op }; diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c index 1f28724d23e5..c61a41df3363 100644 --- a/arch/mips/kernel/branch.c +++ b/arch/mips/kernel/branch.c @@ -799,6 +799,14 @@ int __compute_return_epc_for_insn(struct pt_regs *regs, epc += 4 + (insn.i_format.simmediate << 2); regs->cp0_epc = epc; break; + case beqzcjic_op: + if (!cpu_has_mips_r6) { + ret = -SIGILL; + break; + } + /* Compact branch: BEQZC || JIC */ + regs->cp0_epc += 8; + break; #endif case cbcond0_op: case cbcond1_op: diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index d732100c99f0..f00af84f017d 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -679,6 +679,13 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, dec_insn.next_pc_inc; return 1; + case beqzcjic_op: + if (!cpu_has_mips_r6) + break; + *contpc = regs->cp0_epc + dec_insn.pc_inc + + dec_insn.next_pc_inc; + + return 1; #endif case cop0_op: case cop1_op: |