xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MIPS: Set `si_code' for SIGFPE signals sent from emulation too

Browse Source 
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>
This commit is contained in:
Maciej W. Rozycki
2015-04-03 23:27:15 +01:00
committed by Ralf Baechle
parent 443c44032a
commit 304acb717e
5 changed files with 97 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
arch/mips/include/asm/mips-r2-to-r6-emul.h
View File

@@ -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)