Date: Mon, 22 Feb 2010 14:17:23 +0000 (UTC) From: Nathan Whitehorn <nwhitehorn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r204197 - head/sys/powerpc/aim Message-ID: <201002221417.o1MEHNju067259@svn.freebsd.org>
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Author: nwhitehorn Date: Mon Feb 22 14:17:23 2010 New Revision: 204197 URL: http://svn.freebsd.org/changeset/base/204197 Log: Allow user programs to execute mfpvr instructions. Linux allows this, and some math-related software like GMP expects to be able to use it to pick a target appropriately. MFC after: 1 week Modified: head/sys/powerpc/aim/trap.c Modified: head/sys/powerpc/aim/trap.c ============================================================================== --- head/sys/powerpc/aim/trap.c Mon Feb 22 14:12:23 2010 (r204196) +++ head/sys/powerpc/aim/trap.c Mon Feb 22 14:17:23 2010 (r204197) @@ -82,6 +82,7 @@ static void printtrap(u_int vector, stru int user); static int trap_pfault(struct trapframe *frame, int user); static int fix_unaligned(struct thread *td, struct trapframe *frame); +static int ppc_instr_emulate(struct trapframe *frame); static int handle_onfault(struct trapframe *frame); static void syscall(struct trapframe *frame); @@ -209,7 +210,9 @@ trap(struct trapframe *frame) /* Identify the trap reason */ if (frame->srr1 & EXC_PGM_TRAP) sig = SIGTRAP; - else + else if (ppc_instr_emulate(frame) == 0) + frame->srr0 += 4; + else sig = SIGILL; break; @@ -615,3 +618,21 @@ fix_unaligned(struct thread *td, struct return -1; } + +static int +ppc_instr_emulate(struct trapframe *frame) +{ + uint32_t instr; + int reg; + + instr = fuword32((void *)frame->srr0); + + if ((instr & 0xfc1fffff) == 0x7c1f42a6) { /* mfpvr */ + reg = (instr & ~0xfc1fffff) >> 21; + frame->fixreg[reg] = mfpvr(); + return (0); + } + + return (-1); +} +
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