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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/os-Linux
parent189872f968def833727b6bfef83ebd7440c538e6 (diff)
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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')
-rw-r--r--arch/um/os-Linux/registers.c2
-rw-r--r--arch/um/os-Linux/sys-i386/registers.c35
2 files changed, 34 insertions, 3 deletions
diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c
index b06c780..a32ba6a 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)
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;
+}