x86: x86 user_regset_view

This defines task_user_regset_view and the tables
describing the x86 user_regset layouts for 32 and 64.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index ef349ff170a7..196cc27bd39a 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -15,6 +15,7 @@
 #include <linux/ptrace.h>
 #include <linux/regset.h>
 #include <linux/user.h>
+#include <linux/elf.h>
 #include <linux/security.h>
 #include <linux/audit.h>
 #include <linux/seccomp.h>
@@ -32,6 +33,14 @@
 #include <asm/proto.h>
 #include <asm/ds.h>
 
+#include "tls.h"
+
+enum x86_regset {
+        REGSET_GENERAL,
+        REGSET_FP,
+        REGSET_XFP,
+        REGSET_TLS,
+};
 
 /*
  * does not yet catch signals sent when the child dies.
@@ -1335,6 +1344,84 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
 
 #endif  /* CONFIG_IA32_EMULATION */
 
+#ifdef CONFIG_X86_64
+
+static const struct user_regset x86_64_regsets[] = {
+        [REGSET_GENERAL] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = sizeof(struct user_regs_struct) / sizeof(long),
+                .size = sizeof(long), .align = sizeof(long),
+                .get = genregs_get, .set = genregs_set
+        },
+        [REGSET_FP] = {
+                .core_note_type = NT_PRFPREG,
+                .n = sizeof(struct user_i387_struct) / sizeof(long),
+                .size = sizeof(long), .align = sizeof(long),
+                .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
+        },
+};
+
+static const struct user_regset_view user_x86_64_view = {
+        .name = "x86_64", .e_machine = EM_X86_64,
+        .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
+};
+
+#else  /* CONFIG_X86_32 */
+
+#define user_regs_struct32      user_regs_struct
+#define genregs32_get           genregs_get
+#define genregs32_set           genregs_set
+
+#endif  /* CONFIG_X86_64 */
+
+#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
+static const struct user_regset x86_32_regsets[] = {
+        [REGSET_GENERAL] = {
+                .core_note_type = NT_PRSTATUS,
+                .n = sizeof(struct user_regs_struct32) / sizeof(u32),
+                .size = sizeof(u32), .align = sizeof(u32),
+                .get = genregs32_get, .set = genregs32_set
+        },
+        [REGSET_FP] = {
+                .core_note_type = NT_PRFPREG,
+                .n = sizeof(struct user_i387_struct) / sizeof(u32),
+                .size = sizeof(u32), .align = sizeof(u32),
+                .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
+        },
+        [REGSET_XFP] = {
+                .core_note_type = NT_PRXFPREG,
+                .n = sizeof(struct user_i387_struct) / sizeof(u32),
+                .size = sizeof(u32), .align = sizeof(u32),
+                .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
+        },
+        [REGSET_TLS] = {
+                .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
+                .size = sizeof(struct user_desc),
+                .align = sizeof(struct user_desc),
+                .active = regset_tls_active,
+                .get = regset_tls_get, .set = regset_tls_set
+        },
+};
+
+static const struct user_regset_view user_x86_32_view = {
+        .name = "i386", .e_machine = EM_386,
+        .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
+};
+#endif
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *task)
+{
+#ifdef CONFIG_IA32_EMULATION
+        if (test_tsk_thread_flag(task, TIF_IA32))
+#endif
+#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
+                return &user_x86_32_view;
+#endif
+#ifdef CONFIG_X86_64
+        return &user_x86_64_view;
+#endif
+}
+
 #ifdef CONFIG_X86_32
 
 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)