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MIPS: traps.c: Correct microMIPS RDHWR emulation 

Fix the code to fetch and decode the whole 32-bit instruction.  This
only really matters with the `noulri' kernel parameter as all microMIPS
processors are supposed to have all the hardware registers we support.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/12281/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2016-01-30 09:08:28 +00:00 committed by Ralf Baechle
parent 10f6d99f0f
commit 7aa7047100
1 changed files with 5 additions and 4 deletions
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9
arch/mips/kernel/traps.c
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@ -663,7 +663,7 @@ static int simulate_rdhwr_normal(struct pt_regs *regs, unsigned int opcode)
return -1;
}
static int simulate_rdhwr_mm(struct pt_regs *regs, unsigned short opcode)
static int simulate_rdhwr_mm(struct pt_regs *regs, unsigned int opcode)
{
if ((opcode & MM_POOL32A_FUNC) == MM_RDHWR) {
int rd = (opcode & MM_RS) >> 16;
@ -1119,11 +1119,12 @@ no_r2_instr:
if (get_isa16_mode(regs->cp0_epc)) {
unsigned short mmop[2] = { 0 };
if (unlikely(get_user(mmop[0], epc) < 0))
if (unlikely(get_user(mmop[0], (u16 __user *)epc + 0) < 0))
status = SIGSEGV;
if (unlikely(get_user(mmop[1], epc) < 0))
if (unlikely(get_user(mmop[1], (u16 __user *)epc + 1) < 0))
status = SIGSEGV;
opcode = (mmop[0] << 16) | mmop[1];
opcode = mmop[0];
opcode = (opcode << 16) | mmop[1];
if (status < 0)
status = simulate_rdhwr_mm(regs, opcode);