lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

powerpc: Add VSX context save/restore, ptrace and signal support

Browse Source 
This patch extends the floating point save and restore code to use the
VSX load/stores when VSX is available.  This will make FP context
save/restore marginally slower on FP only code, when VSX is available,
as it has to load/store 128bits rather than just 64bits.

Mixing FP, VMX and VSX code will get constant architected state.

The signals interface is extended to enable access to VSR 0-31
doubleword 1 after discussions with tool chain maintainers.  Backward
compatibility is maintained.

The ptrace interface is also extended to allow access to VSR 0-31 full
registers.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Neuling
2008-06-25 14:07:18 +10:00
committed by Paul Mackerras
parent 72ffff5b17
commit ce48b21007
16 changed files with 451 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
arch/powerpc/kernel/traps.c
View File

@@ -967,6 +967,20 @@ void altivec_unavailable_exception(struct pt_regs *regs)
die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);
}
void vsx_unavailable_exception(struct pt_regs *regs)
{
if (user_mode(regs)) {
/* A user program has executed an vsx instruction,
but this kernel doesn't support vsx. */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return;
}
printk(KERN_EMERG "Unrecoverable VSX Unavailable Exception "
"%lx at %lx\n", regs->trap, regs->nip);
die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT);
}
void performance_monitor_exception(struct pt_regs *regs)
{
perf_irq(regs);
@@ -1099,6 +1113,21 @@ void altivec_assist_exception(struct pt_regs *regs)
}
#endif /* CONFIG_ALTIVEC */
#ifdef CONFIG_VSX
void vsx_assist_exception(struct pt_regs *regs)
{
if (!user_mode(regs)) {
printk(KERN_EMERG "VSX assist exception in kernel mode"
" at %lx\n", regs->nip);
die("Kernel VSX assist exception", regs, SIGILL);
}
flush_vsx_to_thread(current);
printk(KERN_INFO "VSX assist not supported at %lx\n", regs->nip);
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
}
#endif /* CONFIG_VSX */
#ifdef CONFIG_FSL_BOOKE
void CacheLockingException(struct pt_regs *regs, unsigned long address,
unsigned long error_code)