Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x32 support for x86-64 from Ingo Molnar:
 "This tree introduces the X32 binary format and execution mode for x86:
  32-bit data space binaries using 64-bit instructions and 64-bit kernel
  syscalls.

  This allows applications whose working set fits into a 32 bits address
  space to make use of 64-bit instructions while using a 32-bit address
  space with shorter pointers, more compressed data structures, etc."

Fix up trivial context conflicts in arch/x86/{Kconfig,vdso/vma.c}

* 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (71 commits)
  x32: Fix alignment fail in struct compat_siginfo
  x32: Fix stupid ia32/x32 inversion in the siginfo format
  x32: Add ptrace for x32
  x32: Switch to a 64-bit clock_t
  x32: Provide separate is_ia32_task() and is_x32_task() predicates
  x86, mtrr: Use explicit sizing and padding for the 64-bit ioctls
  x86/x32: Fix the binutils auto-detect
  x32: Warn and disable rather than error if binutils too old
  x32: Only clear TIF_X32 flag once
  x32: Make sure TS_COMPAT is cleared for x32 tasks
  fs: Remove missed ->fds_bits from cessation use of fd_set structs internally
  fs: Fix close_on_exec pointer in alloc_fdtable
  x32: Drop non-__vdso weak symbols from the x32 VDSO
  x32: Fix coding style violations in the x32 VDSO code
  x32: Add x32 VDSO support
  x32: Allow x32 to be configured
  x32: If configured, add x32 system calls to system call tables
  x32: Handle process creation
  x32: Signal-related system calls
  x86: Add #ifdef CONFIG_COMPAT to <asm/sys_ia32.h>
  ...

1 files changed, 99 insertions, 0 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 8a634c887652..284c35ae60e4 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -1130,6 +1130,100 @@ static int genregs32_set(struct task_struct *target,
         return ret;
 }
 
+#ifdef CONFIG_X86_X32_ABI
+static long x32_arch_ptrace(struct task_struct *child,
+                            compat_long_t request, compat_ulong_t caddr,
+                            compat_ulong_t cdata)
+{
+        unsigned long addr = caddr;
+        unsigned long data = cdata;
+        void __user *datap = compat_ptr(data);
+        int ret;
+
+        switch (request) {
+        /* Read 32bits at location addr in the USER area.  Only allow
+           to return the lower 32bits of segment and debug registers.  */
+        case PTRACE_PEEKUSR: {
+                u32 tmp;
+
+                ret = -EIO;
+                if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
+                    addr < offsetof(struct user_regs_struct, cs))
+                        break;
+
+                tmp = 0;  /* Default return condition */
+                if (addr < sizeof(struct user_regs_struct))
+                        tmp = getreg(child, addr);
+                else if (addr >= offsetof(struct user, u_debugreg[0]) &&
+                         addr <= offsetof(struct user, u_debugreg[7])) {
+                        addr -= offsetof(struct user, u_debugreg[0]);
+                        tmp = ptrace_get_debugreg(child, addr / sizeof(data));
+                }
+                ret = put_user(tmp, (__u32 __user *)datap);
+                break;
+        }
+
+        /* Write the word at location addr in the USER area.  Only allow
+           to update segment and debug registers with the upper 32bits
+           zero-extended. */
+        case PTRACE_POKEUSR:
+                ret = -EIO;
+                if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
+                    addr < offsetof(struct user_regs_struct, cs))
+                        break;
+
+                if (addr < sizeof(struct user_regs_struct))
+                        ret = putreg(child, addr, data);
+                else if (addr >= offsetof(struct user, u_debugreg[0]) &&
+                         addr <= offsetof(struct user, u_debugreg[7])) {
+                        addr -= offsetof(struct user, u_debugreg[0]);
+                        ret = ptrace_set_debugreg(child,
+                                                  addr / sizeof(data), data);
+                }
+                break;
+
+        case PTRACE_GETREGS:    /* Get all gp regs from the child. */
+                return copy_regset_to_user(child,
+                                           task_user_regset_view(current),
+                                           REGSET_GENERAL,
+                                           0, sizeof(struct user_regs_struct),
+                                           datap);
+
+        case PTRACE_SETREGS:    /* Set all gp regs in the child. */
+                return copy_regset_from_user(child,
+                                             task_user_regset_view(current),
+                                             REGSET_GENERAL,
+                                             0, sizeof(struct user_regs_struct),
+                                             datap);
+
+        case PTRACE_GETFPREGS:  /* Get the child FPU state. */
+                return copy_regset_to_user(child,
+                                           task_user_regset_view(current),
+                                           REGSET_FP,
+                                           0, sizeof(struct user_i387_struct),
+                                           datap);
+
+        case PTRACE_SETFPREGS:  /* Set the child FPU state. */
+                return copy_regset_from_user(child,
+                                             task_user_regset_view(current),
+                                             REGSET_FP,
+                                             0, sizeof(struct user_i387_struct),
+                                             datap);
+
+                /* normal 64bit interface to access TLS data.
+                   Works just like arch_prctl, except that the arguments
+                   are reversed. */
+        case PTRACE_ARCH_PRCTL:
+                return do_arch_prctl(child, data, addr);
+
+        default:
+                return compat_ptrace_request(child, request, addr, data);
+        }
+
+        return ret;
+}
+#endif
+
 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
                         compat_ulong_t caddr, compat_ulong_t cdata)
 {
@@ -1139,6 +1233,11 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
         int ret;
         __u32 val;
 
+#ifdef CONFIG_X86_X32_ABI
+        if (!is_ia32_task())
+                return x32_arch_ptrace(child, request, caddr, cdata);
+#endif
+
         switch (request) {
         case PTRACE_PEEKUSR:
                 ret = getreg32(child, addr, &val);