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

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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
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4
arch/mips/kernel/unaligned.c
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@@ -1076,7 +1076,7 @@ static void emulate_load_store_insn(struct pt_regs *regs,
own_fpu(1); /* Restore FPU state. */
/* Signal if something went wrong. */
process_fpemu_return(res, fault_addr);
process_fpemu_return(res, fault_addr, 0);
if (res == 0)
break;
@@ -1511,7 +1511,7 @@ fpu_emul:
own_fpu(1); /* restore FPU state */
/* If something went wrong, signal */
process_fpemu_return(res, fault_addr);
process_fpemu_return(res, fault_addr, 0);
if (res == 0)
goto success;