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author | Jeff Dike <jdike@addtoit.com> | 2007-10-16 01:26:47 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:05 -0700 |
commit | 42daba316557e597a90a730f61c762602b7f0e0c (patch) | |
tree | 9b7e9da84cef7d2547c577f1cf94b408cf308619 /arch/um/include | |
parent | 5c8aaceab88ac787c0a4038b29143c954c2a45e0 (diff) | |
download | kernel_samsung_smdk4412-42daba316557e597a90a730f61c762602b7f0e0c.zip kernel_samsung_smdk4412-42daba316557e597a90a730f61c762602b7f0e0c.tar.gz kernel_samsung_smdk4412-42daba316557e597a90a730f61c762602b7f0e0c.tar.bz2 |
uml: stop saving process FP state
Throw out a lot of code dealing with saving and restoring floating-point
state. In skas mode, where processes run in a restoring floating-point state
on kernel entry and exit is pointless.
This eliminates most of arch/um/os-Linux/sys-{i386,x86_64}/registers.c. Most
of what remained is now arch-indpendent, and can be moved up to
arch/um/os-Linux/registers.c. Both arches need the jmp_buf accessor
get_thread_reg, and i386 needs {save,restore}_fp_regs because it cheats during
sigreturn by getting the fp state using ptrace rather than copying it out of
the process sigcontext.
After this, it turns out that arch/um/include/skas/mode-skas.h is almost
completely unneeded. The declarations in it are variables which either don't
exist or which don't have global scope. The one exception is
kill_off_processes_skas. If that's removed, this header can be deleted.
This uncovered a bug in user.h, which wasn't correctly making sure that a
size_t definition was available to both userspace and kernelspace files.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/include')
-rw-r--r-- | arch/um/include/os.h | 2 | ||||
-rw-r--r-- | arch/um/include/registers.h | 2 | ||||
-rw-r--r-- | arch/um/include/skas/mode-skas.h | 9 | ||||
-rw-r--r-- | arch/um/include/sysdep-i386/ptrace.h | 11 | ||||
-rw-r--r-- | arch/um/include/user.h | 8 |
5 files changed, 9 insertions, 23 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h index bb6b7d9..c0803e6 100644 --- a/arch/um/include/os.h +++ b/arch/um/include/os.h @@ -307,6 +307,8 @@ extern int protect(struct mm_id * mm_idp, unsigned long addr, extern int is_skas_winch(int pid, int fd, void *data); extern int start_userspace(unsigned long stub_stack); extern int copy_context_skas0(unsigned long stack, int pid); +extern void save_registers(int pid, union uml_pt_regs *regs); +extern void restore_registers(int pid, union uml_pt_regs *regs); extern void userspace(union uml_pt_regs *regs); extern void map_stub_pages(int fd, unsigned long code, unsigned long data, unsigned long stack); diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h index f845b36..b7d2c4e 100644 --- a/arch/um/include/registers.h +++ b/arch/um/include/registers.h @@ -15,7 +15,7 @@ extern int restore_fp_registers(int pid, unsigned long *fp_regs); extern void save_registers(int pid, union uml_pt_regs *regs); extern void restore_registers(int pid, union uml_pt_regs *regs); extern void init_registers(int pid); -extern void get_safe_registers(unsigned long * regs, unsigned long * fp_regs); +extern void get_safe_registers(unsigned long *regs); extern unsigned long get_thread_reg(int reg, jmp_buf *buf); #endif diff --git a/arch/um/include/skas/mode-skas.h b/arch/um/include/skas/mode-skas.h index 8bc6916..e065feb 100644 --- a/arch/um/include/skas/mode-skas.h +++ b/arch/um/include/skas/mode-skas.h @@ -1,18 +1,11 @@ /* - * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) + * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) * Licensed under the GPL */ #ifndef __MODE_SKAS_H__ #define __MODE_SKAS_H__ -#include <sysdep/ptrace.h> - -extern unsigned long exec_regs[]; -extern unsigned long exec_fp_regs[]; -extern unsigned long exec_fpx_regs[]; -extern int have_fpx_regs; - extern void kill_off_processes_skas(void); #endif diff --git a/arch/um/include/sysdep-i386/ptrace.h b/arch/um/include/sysdep-i386/ptrace.h index 52b398b..b45a72f 100644 --- a/arch/um/include/sysdep-i386/ptrace.h +++ b/arch/um/include/sysdep-i386/ptrace.h @@ -219,14 +219,3 @@ struct syscall_args { CHOOSE_MODE((&(r)->tt.faultinfo), (&(r)->skas.faultinfo)) #endif - -/* - * Overrides for Emacs so that we follow Linus's tabbing style. - * Emacs will notice this stuff at the end of the file and automatically - * adjust the settings for this buffer only. This must remain at the end - * of the file. - * --------------------------------------------------------------------------- - * Local variables: - * c-file-style: "linux" - * End: - */ diff --git a/arch/um/include/user.h b/arch/um/include/user.h index d380e6d..99033ff 100644 --- a/arch/um/include/user.h +++ b/arch/um/include/user.h @@ -14,10 +14,12 @@ */ #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) -/* - * This will provide the size_t definition in both kernel and userspace builds - */ +/* This is to get size_t */ +#ifdef __KERNEL__ #include <linux/types.h> +#else +#include <stddef.h> +#endif extern void panic(const char *fmt, ...) __attribute__ ((format (printf, 1, 2))); |