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authorMaciej W. Rozycki <macro@linux-mips.org>2015-04-03 23:27:15 +0100
committerRalf Baechle <ralf@linux-mips.org>2015-04-08 01:10:19 +0200
commit304acb717e5b67cf56f05bc5b21123758e1f7ea0 (patch)
tree031d9969f99864c02701d9df056f92c894a56116 /arch/mips/include
parent443c44032a54f9acf027a8e688380fddc809bc19 (diff)
MIPS: Set `si_code' for SIGFPE signals sent from emulation too
Rework `process_fpemu_return' and move IEEE 754 exception interpretation there, from `do_fpe'. Record the cause bits set in FCSR before they are cleared and pass them through to `process_fpemu_return' so as to set `si_code' correctly too for SIGFPE signals sent from emulation rather than those issued by hardware with the FPE processor exception only. For simplicity `mipsr2_decoder' assumes `*fcr31' has been preinitialised and only sets it to anything if an FPU instruction has been emulated, which in turn is the only case SIGFPE can be issued for here. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9705/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/include')
-rw-r--r--arch/mips/include/asm/fpu_emulator.h3
-rw-r--r--arch/mips/include/asm/mips-r2-to-r6-emul.h9
2 files changed, 9 insertions, 3 deletions
diff --git a/arch/mips/include/asm/fpu_emulator.h b/arch/mips/include/asm/fpu_emulator.h
index 6370c82eb5e1..bfcc5c64b7b0 100644
--- a/arch/mips/include/asm/fpu_emulator.h
+++ b/arch/mips/include/asm/fpu_emulator.h
@@ -66,7 +66,8 @@ extern int do_dsemulret(struct pt_regs *xcp);
extern int fpu_emulator_cop1Handler(struct pt_regs *xcp,
struct mips_fpu_struct *ctx, int has_fpu,
void *__user *fault_addr);
-int process_fpemu_return(int sig, void __user *fault_addr);
+int process_fpemu_return(int sig, void __user *fault_addr,
+ unsigned long fcr31);
int mm_isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn,
unsigned long *contpc);
diff --git a/arch/mips/include/asm/mips-r2-to-r6-emul.h b/arch/mips/include/asm/mips-r2-to-r6-emul.h
index dd6f1de5b621..4b89f28047f7 100644
--- a/arch/mips/include/asm/mips-r2-to-r6-emul.h
+++ b/arch/mips/include/asm/mips-r2-to-r6-emul.h
@@ -84,11 +84,16 @@ extern void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
#ifndef CONFIG_MIPSR2_TO_R6_EMULATOR
static int mipsr2_emulation;
-static inline int mipsr2_decoder(struct pt_regs *regs, u32 inst) { return 0; };
+static inline int mipsr2_decoder(struct pt_regs *regs, u32 inst,
+ unsigned long *fcr31)
+{
+ return 0;
+};
#else
/* MIPS R2 Emulator ON/OFF */
extern int mipsr2_emulation;
-extern int mipsr2_decoder(struct pt_regs *regs, u32 inst);
+extern int mipsr2_decoder(struct pt_regs *regs, u32 inst,
+ unsigned long *fcr31);
#endif /* CONFIG_MIPSR2_TO_R6_EMULATOR */
#define NO_R6EMU (cpu_has_mips_r6 && !mipsr2_emulation)