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Subject[PATCH v16 04/10] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64
Date
In order to introduce new arch_prctls that are not 64 bit only, rename the
existing 64 bit implementation to do_arch_prctl_64(). Also rename the second
argument to arch_prctl(), which will no longer always be an address.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
---
arch/um/include/shared/os.h | 2 +-
arch/x86/include/asm/proto.h | 3 +--
arch/x86/kernel/process_64.c | 32 +++++++++++++++++---------------
arch/x86/kernel/ptrace.c | 8 ++++----
arch/x86/um/os-Linux/prctl.c | 4 ++--
arch/x86/um/syscalls_64.c | 14 +++++++-------
6 files changed, 32 insertions(+), 31 deletions(-)

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index 32e41c4ef6d3..cd1fa97776c3 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -303,7 +303,7 @@ extern void maybe_sigio_broken(int fd, int read);
extern void sigio_broken(int fd, int read);

/* prctl.c */
-extern int os_arch_prctl(int pid, int option, unsigned long *addr);
+extern int os_arch_prctl(int pid, int option, unsigned long *arg2);

/* tty.c */
extern int get_pty(void);
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index 91675a960391..4e276f6cb1c1 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h
@@ -9,6 +9,7 @@ void syscall_init(void);

#ifdef CONFIG_X86_64
void entry_SYSCALL_64(void);
+long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2);
#endif

#ifdef CONFIG_X86_32
@@ -30,6 +31,4 @@ void x86_report_nx(void);

extern int reboot_force;

-long do_arch_prctl(struct task_struct *task, int option, unsigned long addr);
-
#endif /* _ASM_X86_PROTO_H */
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index bf9d7b6c0223..e37f764c11cc 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -205,7 +205,7 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
(struct user_desc __user *)tls, 0);
else
#endif
- err = do_arch_prctl(p, ARCH_SET_FS, tls);
+ err = do_arch_prctl_64(p, ARCH_SET_FS, tls);
if (err)
goto out;
}
@@ -548,7 +548,7 @@ static long prctl_map_vdso(const struct vdso_image *image, unsigned long addr)
}
#endif

-long do_arch_prctl(struct task_struct *task, int option, unsigned long addr)
+long do_arch_prctl_64(struct task_struct *task, int option, unsigned long arg2)
{
int ret = 0;
int doit = task == current;
@@ -556,62 +556,64 @@ long do_arch_prctl(struct task_struct *task, int option, unsigned long addr)

switch (option) {
case ARCH_SET_GS:
- if (addr >= TASK_SIZE_MAX)
+ if (arg2 >= TASK_SIZE_MAX)
return -EPERM;
cpu = get_cpu();
task->thread.gsindex = 0;
- task->thread.gsbase = addr;
+ task->thread.gsbase = arg2;
if (doit) {
load_gs_index(0);
- ret = wrmsrl_safe(MSR_KERNEL_GS_BASE, addr);
+ ret = wrmsrl_safe(MSR_KERNEL_GS_BASE, arg2);
}
put_cpu();
break;
case ARCH_SET_FS:
/* Not strictly needed for fs, but do it for symmetry
with gs */
- if (addr >= TASK_SIZE_MAX)
+ if (arg2 >= TASK_SIZE_MAX)
return -EPERM;
cpu = get_cpu();
task->thread.fsindex = 0;
- task->thread.fsbase = addr;
+ task->thread.fsbase = arg2;
if (doit) {
/* set the selector to 0 to not confuse __switch_to */
loadsegment(fs, 0);
- ret = wrmsrl_safe(MSR_FS_BASE, addr);
+ ret = wrmsrl_safe(MSR_FS_BASE, arg2);
}
put_cpu();
break;
case ARCH_GET_FS: {
unsigned long base;
+
if (doit)
rdmsrl(MSR_FS_BASE, base);
else
base = task->thread.fsbase;
- ret = put_user(base, (unsigned long __user *)addr);
+ ret = put_user(base, (unsigned long __user *)arg2);
break;
}
case ARCH_GET_GS: {
unsigned long base;
+
if (doit)
rdmsrl(MSR_KERNEL_GS_BASE, base);
else
base = task->thread.gsbase;
- ret = put_user(base, (unsigned long __user *)addr);
+ ret = put_user(base, (unsigned long __user *)arg2);
break;
}

#ifdef CONFIG_CHECKPOINT_RESTORE
# ifdef CONFIG_X86_X32_ABI
case ARCH_MAP_VDSO_X32:
- return prctl_map_vdso(&vdso_image_x32, addr);
+ return prctl_map_vdso(&vdso_image_x32, arg2);
# endif
# if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
case ARCH_MAP_VDSO_32:
- return prctl_map_vdso(&vdso_image_32, addr);
+ return prctl_map_vdso(&vdso_image_32, arg2);
# endif
case ARCH_MAP_VDSO_64:
- return prctl_map_vdso(&vdso_image_64, addr);
+ return prctl_map_vdso(&vdso_image_64, arg2);
#endif

default:
@@ -622,9 +624,9 @@ long do_arch_prctl(struct task_struct *task, int option, unsigned long addr)
return ret;
}

-SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, addr)
+SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{
- return do_arch_prctl(current, option, addr);
+ return do_arch_prctl_64(current, option, arg2);
}

unsigned long KSTK_ESP(struct task_struct *task)
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 2364b23ea3e5..f37d18124648 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -396,12 +396,12 @@ static int putreg(struct task_struct *child,
if (value >= TASK_SIZE_MAX)
return -EIO;
/*
- * When changing the segment base, use do_arch_prctl
+ * When changing the segment base, use do_arch_prctl_64
* to set either thread.fs or thread.fsindex and the
* corresponding GDT slot.
*/
if (child->thread.fsbase != value)
- return do_arch_prctl(child, ARCH_SET_FS, value);
+ return do_arch_prctl_64(child, ARCH_SET_FS, value);
return 0;
case offsetof(struct user_regs_struct,gs_base):
/*
@@ -410,7 +410,7 @@ static int putreg(struct task_struct *child,
if (value >= TASK_SIZE_MAX)
return -EIO;
if (child->thread.gsbase != value)
- return do_arch_prctl(child, ARCH_SET_GS, value);
+ return do_arch_prctl_64(child, ARCH_SET_GS, value);
return 0;
#endif
}
@@ -869,7 +869,7 @@ long arch_ptrace(struct task_struct *child, long request,
Works just like arch_prctl, except that the arguments
are reversed. */
case PTRACE_ARCH_PRCTL:
- ret = do_arch_prctl(child, data, addr);
+ ret = do_arch_prctl_64(child, data, addr);
break;
#endif

diff --git a/arch/x86/um/os-Linux/prctl.c b/arch/x86/um/os-Linux/prctl.c
index 0a6e16a35b77..8431e87ac333 100644
--- a/arch/x86/um/os-Linux/prctl.c
+++ b/arch/x86/um/os-Linux/prctl.c
@@ -6,7 +6,7 @@
#include <sys/ptrace.h>
#include <asm/ptrace.h>

-int os_arch_prctl(int pid, int option, unsigned long *addr)
+int os_arch_prctl(int pid, int option, unsigned long *arg2)
{
- return ptrace(PTRACE_ARCH_PRCTL, pid, (unsigned long) addr, option);
+ return ptrace(PTRACE_ARCH_PRCTL, pid, (unsigned long) arg2, option);
}
diff --git a/arch/x86/um/syscalls_64.c b/arch/x86/um/syscalls_64.c
index 42369fa5421f..81b9fe100f7c 100644
--- a/arch/x86/um/syscalls_64.c
+++ b/arch/x86/um/syscalls_64.c
@@ -12,10 +12,10 @@
#include <asm/prctl.h> /* XXX This should get the constants from libc */
#include <os.h>

-long arch_prctl(struct task_struct *task, int option
- unsigned long __user *addr)
+long arch_prctl(struct task_struct *task, int option)
+ unsigned long __user *arg2)
{
- unsigned long *ptr = addr, tmp;
+ unsigned long *ptr = arg2, tmp;
long ret;
int pid = task->mm->context.id.u.pid;

@@ -65,19 +65,19 @@ long arch_prctl(struct task_struct *task, int option
ret = save_registers(pid, &current->thread.regs.regs);
break;
case ARCH_GET_FS:
- ret = put_user(tmp, addr);
+ ret = put_user(tmp, arg2);
break;
case ARCH_GET_GS:
- ret = put_user(tmp, addr);
+ ret = put_user(tmp, arg2);
break;
}

return ret;
}

-SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, addr)
+SYSCALL_DEFINE2(arch_prctl, int, option, unsigned long, arg2)
{
- return arch_prctl(current, option, (unsigned long __user *) addr);
+ return arch_prctl(current, option, (unsigned long __user *) arg2);
}

void arch_switch_to(struct task_struct *to)
--
2.11.0
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