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MIPS: math-emu: Add mfhc1 & mthc1 support.

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This patch adds support for the mfhc1 & mthc1 instructions to the FPU
emulator. These instructions were introduced in release 2 of the MIPS32
& MIPS64 architectures and allow access to the most significant 32 bits
of a 64-bit FP register.

[ralf@linux-mips.org: Fix ifdef hell added by original patch.]

Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6112/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Leonid Yegoshin 2013-11-07 12:48:28 +00:00 committed by Ralf Baechle
parent 7e22e91102
commit 1ac944007b
2 changed files with 27 additions and 2 deletions
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5
arch/mips/include/uapi/asm/inst.h
View File

@ -98,8 +98,9 @@ enum rt_op {
*/
enum cop_op {
mfc_op = 0x00, dmfc_op = 0x01,
cfc_op = 0x02, mtc_op = 0x04,
dmtc_op = 0x05, ctc_op = 0x06,
cfc_op = 0x02, mfhc_op = 0x03,
mtc_op = 0x04, dmtc_op = 0x05,
ctc_op = 0x06, mthc_op = 0x07,
bc_op = 0x08, cop_op = 0x10,
copm_op = 0x18
};

24
arch/mips/math-emu/cp1emu.c
View File

@ -878,6 +878,10 @@ static inline int cop1_64bit(struct pt_regs *xcp)
ctx->fpr[x & ~1] >> 32 << 32 | (u32)(si) : \
ctx->fpr[x & ~1] << 32 >> 32 | (u64)(si) << 32)
#define SIFROMHREG(si, x) ((si) = (int)(ctx->fpr[x] >> 32))
#define SITOHREG(si, x) (ctx->fpr[x] = \
ctx->fpr[x] << 32 >> 32 | (u64)(si) << 32)
#define DIFROMREG(di, x) ((di) = ctx->fpr[x & ~(cop1_64bit(xcp) == 0)])
#define DITOREG(di, x) (ctx->fpr[x & ~(cop1_64bit(xcp) == 0)] = (di))
@ -1055,6 +1059,25 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
break;
#endif
case mfhc_op:
if (!cpu_has_mips_r2)
goto sigill;
/* copregister rd -> gpr[rt] */
if (MIPSInst_RT(ir) != 0) {
SIFROMHREG(xcp->regs[MIPSInst_RT(ir)],
MIPSInst_RD(ir));
}
break;
case mthc_op:
if (!cpu_has_mips_r2)
goto sigill;
/* copregister rd <- gpr[rt] */
SITOHREG(xcp->regs[MIPSInst_RT(ir)], MIPSInst_RD(ir));
break;
case mfc_op:
/* copregister rd -> gpr[rt] */
if (MIPSInst_RT(ir) != 0) {
@ -1263,6 +1286,7 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
#endif
default:
sigill:
return SIGILL;
}