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Diffstat (limited to 'arch/powerpc/math-emu/math.c')
-rw-r--r--arch/powerpc/math-emu/math.c89
1 files changed, 27 insertions, 62 deletions
diff --git a/arch/powerpc/math-emu/math.c b/arch/powerpc/math-emu/math.c
index 0328e66e0799..ab151f040502 100644
--- a/arch/powerpc/math-emu/math.c
+++ b/arch/powerpc/math-emu/math.c
@@ -7,12 +7,27 @@
#include <asm/uaccess.h>
#include <asm/reg.h>
+#include <asm/switch_to.h>
#include <asm/sfp-machine.h>
#include <math-emu/double.h>
#define FLOATFUNC(x) extern int x(void *, void *, void *, void *)
+/* The instructions list which may be not implemented by a hardware FPU */
+FLOATFUNC(fre);
+FLOATFUNC(frsqrtes);
+FLOATFUNC(fsqrt);
+FLOATFUNC(fsqrts);
+FLOATFUNC(mtfsf);
+FLOATFUNC(mtfsfi);
+
+#ifdef CONFIG_MATH_EMULATION_HW_UNIMPLEMENTED
+#undef FLOATFUNC(x)
+#define FLOATFUNC(x) static inline int x(void *op1, void *op2, void *op3, \
+ void *op4) { }
+#endif
+
FLOATFUNC(fadd);
FLOATFUNC(fadds);
FLOATFUNC(fdiv);
@@ -42,8 +57,6 @@ FLOATFUNC(mcrfs);
FLOATFUNC(mffs);
FLOATFUNC(mtfsb0);
FLOATFUNC(mtfsb1);
-FLOATFUNC(mtfsf);
-FLOATFUNC(mtfsfi);
FLOATFUNC(lfd);
FLOATFUNC(lfs);
@@ -58,13 +71,9 @@ FLOATFUNC(fnabs);
FLOATFUNC(fneg);
/* Optional */
-FLOATFUNC(fre);
FLOATFUNC(fres);
FLOATFUNC(frsqrte);
-FLOATFUNC(frsqrtes);
FLOATFUNC(fsel);
-FLOATFUNC(fsqrt);
-FLOATFUNC(fsqrts);
#define OP31 0x1f /* 31 */
@@ -154,7 +163,6 @@ FLOATFUNC(fsqrts);
#define XEU 15
#define XFLB 10
-#ifdef CONFIG_MATH_EMULATION
static int
record_exception(struct pt_regs *regs, int eflag)
{
@@ -212,7 +220,6 @@ record_exception(struct pt_regs *regs, int eflag)
return (fpscr & FPSCR_FEX) ? 1 : 0;
}
-#endif /* CONFIG_MATH_EMULATION */
int
do_mathemu(struct pt_regs *regs)
@@ -222,56 +229,13 @@ do_mathemu(struct pt_regs *regs)
signed short sdisp;
u32 insn = 0;
int idx = 0;
-#ifdef CONFIG_MATH_EMULATION
int (*func)(void *, void *, void *, void *);
int type = 0;
int eflag, trap;
-#endif
if (get_user(insn, (u32 *)pc))
return -EFAULT;
-#ifndef CONFIG_MATH_EMULATION
- switch (insn >> 26) {
- case LFD:
- idx = (insn >> 16) & 0x1f;
- sdisp = (insn & 0xffff);
- op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
- lfd(op0, op1, op2, op3);
- break;
- case LFDU:
- idx = (insn >> 16) & 0x1f;
- sdisp = (insn & 0xffff);
- op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
- lfd(op0, op1, op2, op3);
- regs->gpr[idx] = (unsigned long)op1;
- break;
- case STFD:
- idx = (insn >> 16) & 0x1f;
- sdisp = (insn & 0xffff);
- op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
- stfd(op0, op1, op2, op3);
- break;
- case STFDU:
- idx = (insn >> 16) & 0x1f;
- sdisp = (insn & 0xffff);
- op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0) + sdisp);
- stfd(op0, op1, op2, op3);
- regs->gpr[idx] = (unsigned long)op1;
- break;
- case OP63:
- op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)&current->thread.TS_FPR((insn >> 11) & 0x1f);
- fmr(op0, op1, op2, op3);
- break;
- default:
- goto illegal;
- }
-#else /* CONFIG_MATH_EMULATION */
switch (insn >> 26) {
case LFS: func = lfs; type = D; break;
case LFSU: func = lfs; type = DU; break;
@@ -416,21 +380,16 @@ do_mathemu(struct pt_regs *regs)
case XE:
idx = (insn >> 16) & 0x1f;
op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- if (!idx) {
- if (((insn >> 1) & 0x3ff) == STFIWX)
- op1 = (void *)(regs->gpr[(insn >> 11) & 0x1f]);
- else
- goto illegal;
- } else {
- op1 = (void *)(regs->gpr[idx] + regs->gpr[(insn >> 11) & 0x1f]);
- }
-
+ op1 = (void *)((idx ? regs->gpr[idx] : 0)
+ + regs->gpr[(insn >> 11) & 0x1f]);
break;
case XEU:
idx = (insn >> 16) & 0x1f;
+ if (!idx)
+ goto illegal;
op0 = (void *)&current->thread.TS_FPR((insn >> 21) & 0x1f);
- op1 = (void *)((idx ? regs->gpr[idx] : 0)
+ op1 = (void *)(regs->gpr[idx]
+ regs->gpr[(insn >> 11) & 0x1f]);
break;
@@ -465,6 +424,13 @@ do_mathemu(struct pt_regs *regs)
goto illegal;
}
+ /*
+ * If we support a HW FPU, we need to ensure the FP state
+ * is flushed into the thread_struct before attempting
+ * emulation
+ */
+ flush_fp_to_thread(current);
+
eflag = func(op0, op1, op2, op3);
if (insn & 1) {
@@ -485,7 +451,6 @@ do_mathemu(struct pt_regs *regs)
default:
break;
}
-#endif /* CONFIG_MATH_EMULATION */
regs->nip += 4;
return 0;
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