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[PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64

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  [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64 Kyle Huey <me@kylehuey.com> - 2016-11-17 03:10 +0100
    Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to  do_arch_prctl_64 Ingo Molnar <mingo@kernel.org> - 2016-11-18 08:30 +0100
      Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to  do_arch_prctl_64 Thomas Gleixner <tglx@linutronix.de> - 2016-11-18 08:40 +0100
        Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to  do_arch_prctl_64 Ingo Molnar <mingo@kernel.org> - 2016-11-18 09:20 +0100
      Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64 Kyle Huey <me@kylehuey.com> - 2016-11-18 17:40 +0100

#1524021 — [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64

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    | 12 ++++++------
 6 files changed, 31 insertions(+), 30 deletions(-)

diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h
index de5d572..2b47e0e 100644
--- a/arch/um/include/shared/os.h
+++ b/arch/um/include/shared/os.h
@@ -298,17 +298,17 @@ extern void os_set_ioignore(void);
 
 /* sigio.c */
 extern int add_sigio_fd(int fd);
 extern int ignore_sigio_fd(int fd);
 extern void maybe_sigio_broken(int fd, int read);
 extern void sigio_broken(int fd, int read);
 
 /* sys-x86_64/prctl.c */
-extern int os_arch_prctl(int pid, int code, unsigned long *addr);
+extern int os_arch_prctl(int pid, int code, unsigned long *arg2);
 
 /* tty.c */
 extern int get_pty(void);
 
 /* sys-$ARCH/task_size.c */
 extern unsigned long os_get_top_address(void);
 
 long syscall(long number, ...);
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index 9b9b30b..f8e9194 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h
@@ -4,16 +4,17 @@
 #include <asm/ldt.h>
 
 /* misc architecture specific prototypes */
 
 void syscall_init(void);
 
 #ifdef CONFIG_X86_64
 void entry_SYSCALL_64(void);
+long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
 #endif
 
 #ifdef CONFIG_X86_32
 void entry_INT80_32(void);
 void entry_SYSENTER_32(void);
 void __begin_SYSENTER_singlestep_region(void);
 void __end_SYSENTER_singlestep_region(void);
 #endif
@@ -25,11 +26,9 @@ void entry_SYSCALL_compat(void);
 void entry_INT80_compat(void);
 #endif
 
 void x86_configure_nx(void);
 void x86_report_nx(void);
 
 extern int reboot_force;
 
-long do_arch_prctl(struct task_struct *task, int code, 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 2718cf9..611df20 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -193,17 +193,17 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long sp,
 	 */
 	if (clone_flags & CLONE_SETTLS) {
 #ifdef CONFIG_IA32_EMULATION
 		if (in_ia32_syscall())
 			err = do_set_thread_area(p, -1,
 				(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;
 	}
 	err = 0;
 out:
 	if (err && p->thread.io_bitmap_ptr) {
 		kfree(p->thread.io_bitmap_ptr);
 		p->thread.io_bitmap_max = 0;
@@ -534,91 +534,93 @@ static long prctl_map_vdso(const struct vdso_image *image, unsigned long addr)
 	ret = map_vdso_once(image, addr);
 	if (ret)
 		return ret;
 
 	return (long)image->size;
 }
 #endif
 
-long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
+long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2)
 {
 	int ret = 0;
 	int doit = task == current;
 	int cpu;
 
 	switch (code) {
 	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:
 		ret = -EINVAL;
 		break;
 	}
 
 	return ret;
 }
 
-SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, addr)
+SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
 {
-	return do_arch_prctl(current, code, addr);
+	return do_arch_prctl_64(current, code, arg2);
 }
 
 unsigned long KSTK_ESP(struct task_struct *task)
 {
 	return task_pt_regs(task)->sp;
 }
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index 0e63c02..5004302 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -390,31 +390,31 @@ static int putreg(struct task_struct *child,
 	case offsetof(struct user_regs_struct, flags):
 		return set_flags(child, value);
 
 #ifdef CONFIG_X86_64
 	case offsetof(struct user_regs_struct,fs_base):
 		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):
 		/*
 		 * Exactly the same here as the %fs handling above.
 		 */
 		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
 	}
 
 	*pt_regs_access(task_pt_regs(child), offset) = value;
 	return 0;
 }
 
@@ -863,17 +863,17 @@ long arch_ptrace(struct task_struct *child, long request,
 		break;
 #endif
 
 #ifdef CONFIG_X86_64
 		/* normal 64bit interface to access TLS data.
 		   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
 
 	default:
 		ret = ptrace_request(child, request, addr, data);
 		break;
 	}
 
diff --git a/arch/x86/um/os-Linux/prctl.c b/arch/x86/um/os-Linux/prctl.c
index 96eb2bd..efc9d74 100644
--- a/arch/x86/um/os-Linux/prctl.c
+++ b/arch/x86/um/os-Linux/prctl.c
@@ -1,12 +1,12 @@
 /*
  * Copyright (C) 2007 Jeff Dike (jdike@{addtoit.com,linux.intel.com})
  * Licensed under the GPL
  */
 
 #include <sys/ptrace.h>
 #include <asm/ptrace.h>
 
-int os_arch_prctl(int pid, int code, unsigned long *addr)
+int os_arch_prctl(int pid, int code, unsigned long *arg2)
 {
-        return ptrace(PTRACE_ARCH_PRCTL, pid, (unsigned long) addr, code);
+	return ptrace(PTRACE_ARCH_PRCTL, pid, (unsigned long) arg2, code);
 }
diff --git a/arch/x86/um/syscalls_64.c b/arch/x86/um/syscalls_64.c
index ab3f7f4..d472c6b 100644
--- a/arch/x86/um/syscalls_64.c
+++ b/arch/x86/um/syscalls_64.c
@@ -6,19 +6,19 @@
  */
 
 #include <linux/sched.h>
 #include <linux/syscalls.h>
 #include <linux/uaccess.h>
 #include <asm/prctl.h> /* XXX This should get the constants from libc */
 #include <os.h>
 
-long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
+long arch_prctl(struct task_struct *task, int code, unsigned long __user *arg2)
 {
-	unsigned long *ptr = addr, tmp;
+	unsigned long *ptr = arg2, tmp;
 	long ret;
 	int pid = task->mm->context.id.u.pid;
 
 	/*
 	 * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
 	 * be safe), we need to call arch_prctl on the host because
 	 * setting %fs may result in something else happening (like a
 	 * GDT or thread.fs being set instead).  So, we let the host
@@ -58,29 +58,29 @@ long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
 	case ARCH_SET_FS:
 		current->thread.arch.fs = (unsigned long) ptr;
 		ret = save_registers(pid, &current->thread.regs.regs);
 		break;
 	case ARCH_SET_GS:
 		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, code, unsigned long, addr)
+SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
 {
-	return arch_prctl(current, code, (unsigned long __user *) addr);
+	return arch_prctl(current, code, (unsigned long __user *) arg2);
 }
 
 void arch_switch_to(struct task_struct *to)
 {
 	if ((to->thread.arch.fs == 0) || (to->mm == NULL))
 		return;
 
 	arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
-- 
2.10.2

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#1525042 — Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64

* Kyle Huey <me@kylehuey.com> wrote:

> 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.

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

Could you please also rename the weirdly named 'code' argument to 'option',
to be in line with the existing sys_prctl() interface nomenclature?

Thanks,

	Ingo

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#1525045 — Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64

On Fri, 18 Nov 2016, Ingo Molnar wrote:

> 
> * Kyle Huey <me@kylehuey.com> wrote:
> 
> > 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.
> 
> >  #ifdef CONFIG_X86_64
> >  void entry_SYSCALL_64(void);
> > +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
> >  #endif
> 
> Could you please also rename the weirdly named 'code' argument to 'option',
> to be in line with the existing sys_prctl() interface nomenclature?

I'll fix that up when picking up the series. No need for another iteration, ok?

Thanks,

	tglx

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#1525064 — Re: [PATCH v12 2/7] x86/arch_prctl/64: Rename do_arch_prctl to do_arch_prctl_64

* Thomas Gleixner <tglx@linutronix.de> wrote:

> On Fri, 18 Nov 2016, Ingo Molnar wrote:
> 
> > 
> > * Kyle Huey <me@kylehuey.com> wrote:
> > 
> > > 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.
> > 
> > >  #ifdef CONFIG_X86_64
> > >  void entry_SYSCALL_64(void);
> > > +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
> > >  #endif
> > 
> > Could you please also rename the weirdly named 'code' argument to 'option',
> > to be in line with the existing sys_prctl() interface nomenclature?
> 
> I'll fix that up when picking up the series. No need for another iteration, ok?

I think the main patch needs a bit of conceptual work still:

 - simpler ABI
 - better exec() behavior
 - simpler, better, faster implementation for the MSR writes

... see the mail I just wrote.

Thanks,

	Ingo

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#1525501

On Thu, Nov 17, 2016 at 11:27 PM, Ingo Molnar <mingo@kernel.org> wrote:
>
> * Kyle Huey <me@kylehuey.com> wrote:
>
>> 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.
>
>>  #ifdef CONFIG_X86_64
>>  void entry_SYSCALL_64(void);
>> +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2);
>>  #endif
>
> Could you please also rename the weirdly named 'code' argument to 'option',
> to be in line with the existing sys_prctl() interface nomenclature?

arch_prctl consistently uses 'code' throughout the kernel and in the
main page.  This renaming should probably be done separately if
desired.

- Kyle

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