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powerpc: fix e500 SPE float SIGFPE generation

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The e500 SPE floating-point emulation code is called from
SPEFloatingPointException and SPEFloatingPointRoundException in
arch/powerpc/kernel/traps.c.  Those functions have support for
generating SIGFPE, but do_spe_mathemu and speround_handler don't
generate a return value to indicate that this should be done.  Such a
return value should depend on whether an exception is raised that has
been set via prctl to generate SIGFPE.  This patch adds the relevant
logic in these functions so that SIGFPE is generated as expected by
the glibc testsuite.

Signed-off-by: Joseph Myers <joseph@codesourcery.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
This commit is contained in:
Joseph Myers 2013-11-04 16:55:05 +00:00 committed by Scott Wood
parent 28fbf1d540
commit 01c9ccee3c
1 changed files with 20 additions and 0 deletions
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20
arch/powerpc/math-emu/math_efp.c
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@ -20,6 +20,7 @@
*/
#include <linux/types.h>
#include <linux/prctl.h>
#include <asm/uaccess.h>
#include <asm/reg.h>
@ -691,6 +692,23 @@ int do_spe_mathemu(struct pt_regs *regs)
pr_debug("va: %08x %08x\n", va.wp[0], va.wp[1]);
pr_debug("vb: %08x %08x\n", vb.wp[0], vb.wp[1]);
if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE) {
if ((FP_CUR_EXCEPTIONS & FP_EX_DIVZERO)
&& (current->thread.fpexc_mode & PR_FP_EXC_DIV))
return 1;
if ((FP_CUR_EXCEPTIONS & FP_EX_OVERFLOW)
&& (current->thread.fpexc_mode & PR_FP_EXC_OVF))
return 1;
if ((FP_CUR_EXCEPTIONS & FP_EX_UNDERFLOW)
&& (current->thread.fpexc_mode & PR_FP_EXC_UND))
return 1;
if ((FP_CUR_EXCEPTIONS & FP_EX_INEXACT)
&& (current->thread.fpexc_mode & PR_FP_EXC_RES))
return 1;
if ((FP_CUR_EXCEPTIONS & FP_EX_INVALID)
&& (current->thread.fpexc_mode & PR_FP_EXC_INV))
return 1;
}
return 0;
illegal:
@ -867,6 +885,8 @@ int speround_handler(struct pt_regs *regs)
pr_debug(" to fgpr: %08x %08x\n", fgpr.wp[0], fgpr.wp[1]);
if (current->thread.fpexc_mode & PR_FP_EXC_SW_ENABLE)
return (current->thread.fpexc_mode & PR_FP_EXC_RES) ? 1 : 0;
return 0;
}