diff options
| author | Jeff Dike <jdike@addtoit.com> | 2007-10-16 01:27:15 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:07 -0700 |
| commit | a5f6096c805e6d2fa03ee932f8c70af34cee41a0 (patch) | |
| tree | c74d984c0e2fc2958425df65605dd3451adc6520 /arch/um/include | |
| parent | 189872f968def833727b6bfef83ebd7440c538e6 (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.h | 2 | ||||
| -rw-r--r-- | arch/um/include/sysdep-i386/ptrace.h | 2 | ||||
| -rw-r--r-- | arch/um/include/sysdep-x86_64/ptrace.h | 4 |
3 files changed, 8 insertions, 0 deletions
diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h index 8e8ea9651189..0e27406a43a4 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 edb9393283b5..c16d739d2089 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 2ae04480ac81..7848b7dce715 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 |