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author | Jeff Dike <jdike@addtoit.com> | 2007-10-16 01:27:15 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 09:43:07 -0700 |
commit | a5f6096c805e6d2fa03ee932f8c70af34cee41a0 (patch) | |
tree | c74d984c0e2fc2958425df65605dd3451adc6520 /arch/um/os-Linux/sys-i386 | |
parent | 189872f968def833727b6bfef83ebd7440c538e6 (diff) | |
download | kernel_samsung_smdk4412-a5f6096c805e6d2fa03ee932f8c70af34cee41a0.zip kernel_samsung_smdk4412-a5f6096c805e6d2fa03ee932f8c70af34cee41a0.tar.gz kernel_samsung_smdk4412-a5f6096c805e6d2fa03ee932f8c70af34cee41a0.tar.bz2 |
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/sys-i386')
-rw-r--r-- | arch/um/os-Linux/sys-i386/registers.c | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/arch/um/os-Linux/sys-i386/registers.c b/arch/um/os-Linux/sys-i386/registers.c index f171204..8f1f0ab 100644 --- a/arch/um/os-Linux/sys-i386/registers.c +++ b/arch/um/os-Linux/sys-i386/registers.c @@ -8,9 +8,6 @@ #include "longjmp.h" #include "user.h" -/* XXX These need to use [GS]ETFPXREGS and copy_sc_{to,from}_user_skas needs - * to pass in a sufficiently large buffer - */ int save_fp_registers(int pid, unsigned long *fp_regs) { if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0) @@ -25,6 +22,20 @@ int restore_fp_registers(int pid, unsigned long *fp_regs) return 0; } +int save_fpx_registers(int pid, unsigned long *fp_regs) +{ + if(ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0) + return -errno; + return 0; +} + +int restore_fpx_registers(int pid, unsigned long *fp_regs) +{ + if(ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0) + return -errno; + return 0; +} + unsigned long get_thread_reg(int reg, jmp_buf *buf) { switch(reg){ @@ -36,3 +47,21 @@ unsigned long get_thread_reg(int reg, jmp_buf *buf) return 0; } } + +int have_fpx_regs = 1; + +void arch_init_registers(int pid) +{ + unsigned long fpx_regs[HOST_XFP_SIZE]; + int err; + + err = ptrace(PTRACE_GETFPXREGS, pid, 0, fpx_regs); + if(!err) + return; + + if(errno != EIO) + panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d", + errno); + + have_fpx_regs = 0; +} |