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MIPS: math-emu: Fix prefx detection and COP1X function field definition 

When running applications which contain the instruction "prefx" on FPU-less
CPUs, a message "Illegal instruction" will be seen. This instruction is
supposed to be ignored by the FPU emulator. However, its current detection
and function field encoding are incorrect. This patch fix the issue.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com>
Reviewed-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Acked-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Cc: Steven.Hill@imgtec.com
Patchwork: https://patchwork.linux-mips.org/patch/6608/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Deng-Cheng Zhu 2014-03-06 17:05:27 -08:00 committed by Ralf Baechle
parent 031365b471
commit 51061b8876
2 changed files with 5 additions and 5 deletions
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4
arch/mips/include/uapi/asm/inst.h
View File

@ -163,8 +163,8 @@ enum cop1_sdw_func {
*/
enum cop1x_func {
lwxc1_op = 0x00, ldxc1_op = 0x01,
pfetch_op = 0x07, swxc1_op = 0x08,
sdxc1_op = 0x09, madd_s_op = 0x20,
swxc1_op = 0x08, sdxc1_op = 0x09,
pfetch_op = 0x0f, madd_s_op = 0x20,
madd_d_op = 0x21, madd_e_op = 0x22,
msub_s_op = 0x28, msub_d_op = 0x29,
msub_e_op = 0x2a, nmadd_s_op = 0x30,

6
arch/mips/math-emu/cp1emu.c
View File

@ -1538,10 +1538,10 @@ static int fpux_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
break;
}
case 0x7: /* 7 */
if (MIPSInst_FUNC(ir) != pfetch_op) {
case 0x3:
if (MIPSInst_FUNC(ir) != pfetch_op)
return SIGILL;
}
/* ignore prefx operation */
break;