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authorMichael Neuling <mikey@neuling.org>2008-06-25 14:07:18 +1000
committerPaul Mackerras <paulus@samba.org>2008-07-01 11:28:46 +1000
commitc6e6771b87d4e339d27f1383c8a808ae9b4ee5b8 (patch)
tree1900b7350ec685c3a31f2233fd88a57e34725b5c /arch/powerpc/kernel/signal_64.c
parent6f3d8e6947ec98e358514fc0f7b2e37fe88a21bb (diff)
powerpc: Introduce VSX thread_struct and CONFIG_VSX
The layout of the new VSR registers and how they overlap on top of the legacy FPR and VR registers is: VSR doubleword 0 VSR doubleword 1 ---------------------------------------------------------------- VSR[0] | FPR[0] | | ---------------------------------------------------------------- VSR[1] | FPR[1] | | ---------------------------------------------------------------- | ... | | | ... | | ---------------------------------------------------------------- VSR[30] | FPR[30] | | ---------------------------------------------------------------- VSR[31] | FPR[31] | | ---------------------------------------------------------------- VSR[32] | VR[0] | ---------------------------------------------------------------- VSR[33] | VR[1] | ---------------------------------------------------------------- | ... | | ... | ---------------------------------------------------------------- VSR[62] | VR[30] | ---------------------------------------------------------------- VSR[63] | VR[31] | ---------------------------------------------------------------- VSX has 64 128bit registers. The first 32 regs overlap with the FP registers and hence extend them with and additional 64 bits. The second 32 regs overlap with the VMX registers. This commit introduces the thread_struct changes required to reflect this register layout. Ptrace and signals code is updated so that the floating point registers are correctly accessed from the thread_struct when CONFIG_VSX is enabled. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/signal_64.c')
-rw-r--r--arch/powerpc/kernel/signal_64.c32
1 files changed, 29 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index da7c058e373..a587b33cd6b 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -89,6 +89,10 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
#endif
unsigned long msr = regs->msr;
long err = 0;
+#ifdef CONFIG_VSX
+ double buf[FP_REGS_SIZE];
+ int i;
+#endif
flush_fp_to_thread(current);
@@ -112,11 +116,21 @@ static long setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
#else /* CONFIG_ALTIVEC */
err |= __put_user(0, &sc->v_regs);
#endif /* CONFIG_ALTIVEC */
+ flush_fp_to_thread(current);
+#ifdef CONFIG_VSX
+ /* Copy FP to local buffer then write that out */
+ for (i = 0; i < 32 ; i++)
+ buf[i] = current->thread.TS_FPR(i);
+ memcpy(&buf[i], &current->thread.fpscr, sizeof(double));
+ err |= __copy_to_user(&sc->fp_regs, buf, FP_REGS_SIZE);
+#else /* CONFIG_VSX */
+ /* copy fpr regs and fpscr */
+ err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
+#endif /* CONFIG_VSX */
err |= __put_user(&sc->gp_regs, &sc->regs);
WARN_ON(!FULL_REGS(regs));
err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
- err |= __copy_to_user(&sc->fp_regs, &current->thread.fpr, FP_REGS_SIZE);
err |= __put_user(signr, &sc->signal);
err |= __put_user(handler, &sc->handler);
if (set != NULL)
@@ -135,6 +149,9 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
#ifdef CONFIG_ALTIVEC
elf_vrreg_t __user *v_regs;
#endif
+#ifdef CONFIG_VSX
+ double buf[FP_REGS_SIZE];
+#endif
unsigned long err = 0;
unsigned long save_r13 = 0;
elf_greg_t *gregs = (elf_greg_t *)regs;
@@ -182,8 +199,6 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
*/
regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC);
- err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
-
#ifdef CONFIG_ALTIVEC
err |= __get_user(v_regs, &sc->v_regs);
if (err)
@@ -202,7 +217,18 @@ static long restore_sigcontext(struct pt_regs *regs, sigset_t *set, int sig,
else
current->thread.vrsave = 0;
#endif /* CONFIG_ALTIVEC */
+#ifdef CONFIG_VSX
+ /* restore floating point */
+ err |= __copy_from_user(buf, &sc->fp_regs, FP_REGS_SIZE);
+ if (err)
+ return err;
+ for (i = 0; i < 32 ; i++)
+ current->thread.TS_FPR(i) = buf[i];
+ memcpy(&current->thread.fpscr, &buf[i], sizeof(double));
+#else
+ err |= __copy_from_user(&current->thread.fpr, &sc->fp_regs, FP_REGS_SIZE);
+#endif
return err;
}