x32: Handle process creation

Allow an x32 process to be started.

Originally-by: H. J. Lu <hjl.tools@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>

2 files changed, 45 insertions, 6 deletions

diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index 7938b84e4506..e7f68b49c01a 100644
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -6,6 +6,7 @@
  */
 #include <linux/types.h>
 #include <linux/sched.h>
+#include <asm/processor.h>
 #include <asm/user32.h>
 #include <asm/unistd.h>
 
@@ -187,7 +188,20 @@ struct compat_shmid64_ds {
 /*
  * The type of struct elf_prstatus.pr_reg in compatible core dumps.
  */
+#ifdef CONFIG_X86_X32_ABI
+typedef struct user_regs_struct compat_elf_gregset_t;
+
+#define PR_REG_SIZE(S) (test_thread_flag(TIF_IA32) ? 68 : 216)
+#define PRSTATUS_SIZE(S) (test_thread_flag(TIF_IA32) ? 144 : 296)
+#define SET_PR_FPVALID(S,V) \
+  do { *(int *) (((void *) &((S)->pr_reg)) + PR_REG_SIZE(0)) = (V); } \
+  while (0)
+
+#define COMPAT_USE_64BIT_TIME \
+        (!!(task_pt_regs(current)->orig_ax & __X32_SYSCALL_BIT))
+#else
 typedef struct user_regs_struct32 compat_elf_gregset_t;
+#endif
 
 /*
  * A pointer passed in from user mode. This should not
@@ -209,8 +223,16 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
 
 static inline void __user *arch_compat_alloc_user_space(long len)
 {
-        struct pt_regs *regs = task_pt_regs(current);
-        return (void __user *)regs->sp - len;
+        compat_uptr_t sp;
+
+        if (test_thread_flag(TIF_IA32)) {
+                sp = task_pt_regs(current)->sp;
+        } else {
+                /* -128 for the x32 ABI redzone */
+                sp = percpu_read(old_rsp) - 128;
+        }
+
+        return (void __user *)round_down(sp - len, 16);
 }
 
 static inline bool is_compat_task(void)
diff --git a/arch/x86/include/asm/elf.h b/arch/x86/include/asm/elf.h
index 410fa6a219f6..83aabea95dd7 100644
--- a/arch/x86/include/asm/elf.h
+++ b/arch/x86/include/asm/elf.h
@@ -156,7 +156,12 @@ do {						\
 #define elf_check_arch(x)                       \
         ((x)->e_machine == EM_X86_64)
 
-#define compat_elf_check_arch(x)        elf_check_arch_ia32(x)
+#define compat_elf_check_arch(x)                \
+        (elf_check_arch_ia32(x) || (x)->e_machine == EM_X86_64)
+
+#if __USER32_DS != __USER_DS
+# error "The following code assumes __USER32_DS == __USER_DS"
+#endif
 
 static inline void elf_common_init(struct thread_struct *t,
                                    struct pt_regs *regs, const u16 ds)
@@ -179,8 +184,9 @@ static inline void elf_common_init(struct thread_struct *t,
 void start_thread_ia32(struct pt_regs *regs, u32 new_ip, u32 new_sp);
 #define compat_start_thread start_thread_ia32
 
-void set_personality_ia32(void);
-#define COMPAT_SET_PERSONALITY(ex) set_personality_ia32()
+void set_personality_ia32(bool);
+#define COMPAT_SET_PERSONALITY(ex)                      \
+        set_personality_ia32((ex).e_machine == EM_X86_64)
 
 #define COMPAT_ELF_PLATFORM                     ("i686")
 
@@ -296,9 +302,20 @@ do {									\
                             (unsigned long)current->mm->context.vdso);  \
 } while (0)
 
+#define ARCH_DLINFO_X32                                                 \
+do {                                                                    \
+        if (vdso_enabled)                                               \
+                NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
+                            (unsigned long)current->mm->context.vdso);  \
+} while (0)
+
 #define AT_SYSINFO              32
 
-#define COMPAT_ARCH_DLINFO      ARCH_DLINFO_IA32(sysctl_vsyscall32)
+#define COMPAT_ARCH_DLINFO                                              \
+if (test_thread_flag(TIF_X32))                                          \
+        ARCH_DLINFO_X32;                                                \
+else                                                                    \
+        ARCH_DLINFO_IA32(sysctl_vsyscall32)
 
 #define COMPAT_ELF_ET_DYN_BASE  (TASK_UNMAPPED_BASE + 0x1000000)