aboutsummaryrefslogtreecommitdiff
path: root/arch/um/include/os.h
diff options
context:
space:
mode:
authorJeff Dike <jdike@addtoit.com>2007-10-16 01:26:47 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:05 -0700
commit42daba316557e597a90a730f61c762602b7f0e0c (patch)
tree9b7e9da84cef7d2547c577f1cf94b408cf308619 /arch/um/include/os.h
parent5c8aaceab88ac787c0a4038b29143c954c2a45e0 (diff)
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/os.h')
-rw-r--r--arch/um/include/os.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index bb6b7d9e188..c0803e67fc6 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);