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

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>

1 files changed, 4 insertions, 2 deletions

diff --git a/include/asm-powerpc/elf.h b/include/asm-powerpc/elf.h
index d1e3bda0625d..746e53d60cbe 100644
--- a/include/asm-powerpc/elf.h
+++ b/include/asm-powerpc/elf.h
@@ -109,6 +109,7 @@ typedef elf_gregset_t32 compat_elf_gregset_t;
 #ifdef __powerpc64__
 # define ELF_NVRREG32   33      /* includes vscr & vrsave stuffed together */
 # define ELF_NVRREG     34      /* includes vscr & vrsave in split vectors */
+# define ELF_NVSRHALFREG 32     /* Half the vsx registers */
 # define ELF_GREG_TYPE  elf_greg_t64
 #else
 # define ELF_NEVRREG    34      /* includes acc (as 2) */
@@ -158,6 +159,7 @@ typedef __vector128 elf_vrreg_t;
 typedef elf_vrreg_t elf_vrregset_t[ELF_NVRREG];
 #ifdef __powerpc64__
 typedef elf_vrreg_t elf_vrregset_t32[ELF_NVRREG32];
+typedef elf_fpreg_t elf_vsrreghalf_t32[ELF_NVSRHALFREG];
 #endif
 
 #ifdef __KERNEL__
@@ -219,8 +221,8 @@ extern int dump_task_fpu(struct task_struct *, elf_fpregset_t *);
 typedef elf_vrregset_t elf_fpxregset_t;
 
 #ifdef CONFIG_ALTIVEC
-extern int dump_task_altivec(struct task_struct *, elf_vrregset_t *vrregs);
-#define ELF_CORE_COPY_XFPREGS(tsk, regs) dump_task_altivec(tsk, regs)
+extern int dump_task_vector(struct task_struct *, elf_vrregset_t *vrregs);
+#define ELF_CORE_COPY_XFPREGS(tsk, regs) dump_task_vector(tsk, regs)
 #define ELF_CORE_XFPREG_TYPE NT_PPC_VMX
 #endif