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authorJeff Dike <jdike@addtoit.com>2007-10-16 01:27:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:07 -0700
commita5f6096c805e6d2fa03ee932f8c70af34cee41a0 (patch)
treec74d984c0e2fc2958425df65605dd3451adc6520 /arch/um/include
parent189872f968def833727b6bfef83ebd7440c538e6 (diff)
uml: floating point signal delivery fixes
Handle floating point state in across signals correctly. UML/i386 needs to know whether the host does PTRACE_[GS]ETFPXREGS, so an arch_init_registers hook is added, which on x86_64 does nothing. UML doesn't save and restore floating point registers on kernel entry and exit, so they need to be copied between the host process and the sigcontext. save_fpx_registers and restore_fpx_registers are added for this purpose. save_fp_registers and restore_fp_registers already exist. There was a bunch of floating point state conversion code in arch/um/sys-i386/ptrace.c which isn't needed there, but is needed in signal.c, so it is moved over. The i386 code now distinguishes between fp and fpx state and handles them correctly. The x86_64 code just needs to copy state as-is between the host process and the stack. There are also some fixes there to pass the correct address of the floating point state around. 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/registers.h2
-rw-r--r--arch/um/include/sysdep-i386/ptrace.h2
-rw-r--r--arch/um/include/sysdep-x86_64/ptrace.h4
3 files changed, 8 insertions, 0 deletions
diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h
index 8e8ea965118..0e27406a43a 100644
--- a/arch/um/include/registers.h
+++ b/arch/um/include/registers.h
@@ -12,6 +12,8 @@
extern void init_thread_registers(struct uml_pt_regs *to);
extern int save_fp_registers(int pid, unsigned long *fp_regs);
extern int restore_fp_registers(int pid, unsigned long *fp_regs);
+extern int save_fpx_registers(int pid, unsigned long *fp_regs);
+extern int restore_fpx_registers(int pid, unsigned long *fp_regs);
extern void save_registers(int pid, struct uml_pt_regs *regs);
extern void restore_registers(int pid, struct uml_pt_regs *regs);
extern void init_registers(int pid);
diff --git a/arch/um/include/sysdep-i386/ptrace.h b/arch/um/include/sysdep-i386/ptrace.h
index edb9393283b..c16d739d208 100644
--- a/arch/um/include/sysdep-i386/ptrace.h
+++ b/arch/um/include/sysdep-i386/ptrace.h
@@ -168,4 +168,6 @@ struct syscall_args {
#define UPT_FAULTINFO(r) (&(r)->faultinfo)
+extern void arch_init_registers(int pid);
+
#endif
diff --git a/arch/um/include/sysdep-x86_64/ptrace.h b/arch/um/include/sysdep-x86_64/ptrace.h
index 2ae04480ac8..7848b7dce71 100644
--- a/arch/um/include/sysdep-x86_64/ptrace.h
+++ b/arch/um/include/sysdep-x86_64/ptrace.h
@@ -234,4 +234,8 @@ struct syscall_args {
#define UPT_FAULTINFO(r) (&(r)->faultinfo)
+static inline void arch_init_registers(int pid)
+{
+}
+
#endif