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| author | Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> | 2013-03-25 13:08:40 -0500 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-05-09 17:55:18 +0200 |
| commit | fb6883e5809c08e43de23581759af4570ca91b0f (patch) | |
| tree | 2bf479748d969f85c79cb8880a1573b2ca7c61ee /arch/mips/include/asm/branch.h | |
| parent | 2a0b24f56c2492b932f1aed617ae80fb23500d21 (diff) | |
| download | blackbird-op-linux-fb6883e5809c08e43de23581759af4570ca91b0f.tar.gz blackbird-op-linux-fb6883e5809c08e43de23581759af4570ca91b0f.zip | |
MIPS: microMIPS: Support handling of delay slots.
Add logic needed to properly calculate exceptions for delay slots
when in microMIPS mode.
Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Diffstat (limited to 'arch/mips/include/asm/branch.h')
| -rw-r--r-- | arch/mips/include/asm/branch.h | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/arch/mips/include/asm/branch.h b/arch/mips/include/asm/branch.h index 888766ae1f85..40bb9ebcc7aa 100644 --- a/arch/mips/include/asm/branch.h +++ b/arch/mips/include/asm/branch.h @@ -11,6 +11,13 @@ #include <asm/ptrace.h> #include <asm/inst.h> +extern int __isa_exception_epc(struct pt_regs *regs); +extern int __compute_return_epc(struct pt_regs *regs); +extern int __compute_return_epc_for_insn(struct pt_regs *regs, + union mips_instruction insn); +extern int __microMIPS_compute_return_epc(struct pt_regs *regs); + + static inline int delay_slot(struct pt_regs *regs) { return regs->cp0_cause & CAUSEF_BD; @@ -18,20 +25,25 @@ static inline int delay_slot(struct pt_regs *regs) static inline unsigned long exception_epc(struct pt_regs *regs) { - if (!delay_slot(regs)) + if (likely(!delay_slot(regs))) return regs->cp0_epc; + if (get_isa16_mode(regs->cp0_epc)) + return __isa_exception_epc(regs); + return regs->cp0_epc + 4; } #define BRANCH_LIKELY_TAKEN 0x0001 -extern int __compute_return_epc(struct pt_regs *regs); -extern int __compute_return_epc_for_insn(struct pt_regs *regs, - union mips_instruction insn); - static inline int compute_return_epc(struct pt_regs *regs) { + if (get_isa16_mode(regs->cp0_epc)) { + if (cpu_has_mmips) + return __microMIPS_compute_return_epc(regs); + return regs->cp0_epc; + } + if (!delay_slot(regs)) { regs->cp0_epc += 4; return 0; |
