From a5f6096c805e6d2fa03ee932f8c70af34cee41a0 Mon Sep 17 00:00:00 2001 From: Jeff Dike Date: Tue, 16 Oct 2007 01:27:15 -0700 Subject: 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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/um/os-Linux/registers.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/um/os-Linux/registers.c') 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) -- cgit v1.2.1