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authorJames Yang <James.Yang@freescale.com>2013-07-04 16:18:44 -0500
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-08-14 14:59:57 +1000
commitcc7059b5ea730edde256deb94a42f8e9e732d9b8 (patch)
tree227c68582067ee0700b8befa841e34f90b8b4ffa /arch/powerpc/math-emu
parent5f20be4478032eeba66abddc79eae3abea45c5c8 (diff)
downloadlinux-cc7059b5ea730edde256deb94a42f8e9e732d9b8.tar.bz2
powerpc/math-emu: Fix load/store indexed emulation
Load/store indexed instructions where the index register RA=R0, such as "lfdx f1,0,r3", are not illegal. Load/store indexed with update instructions where the index register RA=R0, such as "lfdux f1,0,r3", are invalid, and, to be consistent with existing math-emu behavior for other invalid instruction forms, will signal as illegal. Signed-off-by: James Yang <James.Yang@freescale.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/math-emu')
-rw-r--r--arch/powerpc/math-emu/math.c15
1 files changed, 5 insertions, 10 deletions
diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c
index bc901623d8df..ab151f040502 100644
--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -380,21 +380,16 @@ do_mathemu(struct pt_regs *regs)
case XE:
idx = (insn >> 16) & 0x1f;
op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- if (!idx) {
- if (((insn >> 1) & 0x3ff) == STFIWX)
- op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
- else
- goto illegal;
- } else {
- op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
- }
-
+ op1 = (void *)((idx ? regs->gpr[idx] : 0)
+ + regs->gpr[(insn >> 11) & 0x1f]);
break;
case XEU:
idx = (insn >> 16) & 0x1f;
+ if (!idx)
+ goto illegal;
op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0)
+ op1 = (void *)(regs->gpr[idx]
+ regs->gpr[(insn >> 11) & 0x1f]);
break;