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| 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/os-Linux/registers.c | |
| parent | uml: don't use glibc asm/user.h (diff) | |
| download | linux-dev-a5f6096c805e6d2fa03ee932f8c70af34cee41a0.tar.xz linux-dev-a5f6096c805e6d2fa03ee932f8c70af34cee41a0.zip | |
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/os-Linux/registers.c')
| -rw-r--r-- | arch/um/os-Linux/registers.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c index b06c780e8dba..a32ba6ab1211 100644 --- a/arch/um/os-Linux/registers.c +++ b/arch/um/os-Linux/registers.c @@ -47,6 +47,8 @@ void init_registers(int pid) if (err) panic("check_ptrace : PTRACE_GETREGS failed, errno = %d", errno); + + arch_init_registers(pid); } void get_safe_registers(unsigned long *regs) |