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

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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
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9
include/asm-powerpc/system.h
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@@ -139,6 +139,7 @@ extern void enable_kernel_altivec(void);
extern void giveup_altivec(struct task_struct *);
extern void load_up_altivec(struct task_struct *);
extern int emulate_altivec(struct pt_regs *);
extern void giveup_vsx(struct task_struct *);
extern void enable_kernel_spe(void);
extern void giveup_spe(struct task_struct *);
extern void load_up_spe(struct task_struct *);
@@ -162,6 +163,14 @@ static inline void flush_altivec_to_thread(struct task_struct *t)
}
#endif
#ifdef CONFIG_VSX
extern void flush_vsx_to_thread(struct task_struct *);
#else
static inline void flush_vsx_to_thread(struct task_struct *t)
{
}
#endif
#ifdef CONFIG_SPE
extern void flush_spe_to_thread(struct task_struct *);
#else