From: Kumar Gala Date: Thu, 11 Oct 2007 22:07:34 +0000 (-0500) Subject: [POWERPC] Fix handling of stfiwx math emulation X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ba02946a903015840ef672ccc9dc8620a7e83de6;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [POWERPC] Fix handling of stfiwx math emulation Its legal for the stfiwx instruction to have RA = 0 as part of its effective address calculation. This is illegal for all other XE form instructions. Add code to compute the proper effective address for stfiwx if RA = 0 rather than treating it as illegal. Signed-off-by: Kumar Gala --- diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c index 69058b2873de..381306bb1590 100644 --- a/arch/powerpc/math-emu/math.c +++ b/arch/powerpc/math-emu/math.c @@ -407,11 +407,16 @@ do_mathemu(struct pt_regs *regs) case XE: idx = (insn >> 16) & 0x1f; - if (!idx) - goto illegal; - op0 = (void *)¤t->thread.fpr[(insn >> 21) & 0x1f]; - op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 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]); + } + break; case XEU: