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MFC r204197:

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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.

Reported by:	Jakob van Santen <vansanten at wisc dot edu>
This commit is contained in:
Nathan Whitehorn 2010-03-01 00:38:20 +00:00
parent a0b72790e4
commit 7eb87cc8c7
1 changed files with 22 additions and 1 deletions
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23
sys/powerpc/aim/trap.c
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@ -82,6 +82,7 @@ static void printtrap(u_int vector, struct trapframe *frame, int isfatal,
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);
@ -211,7 +212,9 @@ 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;
@ -632,3 +635,21 @@ fix_unaligned(struct thread *td, struct trapframe *frame)
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);
}