Merge branch 'x86-ptrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-ptrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, ptrace: Remove set_stopped_child_used_math() in [x]fpregs_set
  x86, ptrace: Simplify xstateregs_get()
  ptrace: Fix ptrace_regset() comments and diagnose errors specifically
  parisc: Disable CONFIG_HAVE_ARCH_TRACEHOOK
  ptrace: Add support for generic PTRACE_GETREGSET/PTRACE_SETREGSET
  x86, ptrace: regset extensions to support xstate

2 files changed, 26 insertions, 1 deletions

diff --git a/include/linux/elf.h b/include/linux/elf.h
index 39ad4b230a4a..ad990c5f63f6 100644
--- a/include/linux/elf.h
+++ b/include/linux/elf.h
@@ -349,7 +349,11 @@ typedef struct elf64_shdr {
 #define ELF_OSABI ELFOSABI_NONE
 #endif
 
-/* Notes used in ET_CORE */
+/*
+ * Notes used in ET_CORE. Architectures export some of the arch register sets
+ * using the corresponding note types via the PTRACE_GETREGSET and
+ * PTRACE_SETREGSET requests.
+ */
 #define NT_PRSTATUS     1
 #define NT_PRFPREG      2
 #define NT_PRPSINFO     3
@@ -361,6 +365,7 @@ typedef struct elf64_shdr {
 #define NT_PPC_VSX      0x102           /* PowerPC VSX registers */
 #define NT_386_TLS      0x200           /* i386 TLS slots (struct user_desc) */
 #define NT_386_IOPERM   0x201           /* x86 io permission bitmap (1=deny) */
+#define NT_X86_XSTATE   0x202           /* x86 extended state using xsave */
 #define NT_S390_HIGH_GPRS       0x300   /* s390 upper register halves */
 #define NT_S390_TIMER   0x301           /* s390 timer register */
 #define NT_S390_TODCMP  0x302           /* s390 TOD clock comparator register */
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 56f2d63a5cbb..c5eab89da51e 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -27,6 +27,26 @@
 #define PTRACE_GETSIGINFO       0x4202
 #define PTRACE_SETSIGINFO       0x4203
 
+/*
+ * Generic ptrace interface that exports the architecture specific regsets
+ * using the corresponding NT_* types (which are also used in the core dump).
+ * Please note that the NT_PRSTATUS note type in a core dump contains a full
+ * 'struct elf_prstatus'. But the user_regset for NT_PRSTATUS contains just the
+ * elf_gregset_t that is the pr_reg field of 'struct elf_prstatus'. For all the
+ * other user_regset flavors, the user_regset layout and the ELF core dump note
+ * payload are exactly the same layout.
+ *
+ * This interface usage is as follows:
+ *      struct iovec iov = { buf, len};
+ *
+ *      ret = ptrace(PTRACE_GETREGSET/PTRACE_SETREGSET, pid, NT_XXX_TYPE, &iov);
+ *
+ * On the successful completion, iov.len will be updated by the kernel,
+ * specifying how much the kernel has written/read to/from the user's iov.buf.
+ */
+#define PTRACE_GETREGSET        0x4204
+#define PTRACE_SETREGSET        0x4205
+
 /* options set using PTRACE_SETOPTIONS */
 #define PTRACE_O_TRACESYSGOOD   0x00000001
 #define PTRACE_O_TRACEFORK      0x00000002