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authorJeff Dike <jdike@addtoit.com>2007-08-30 23:56:20 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-08-31 01:42:22 -0700
commitd1254b12c93e1e586137a2ffef71fd33cf273f35 (patch)
treeb122f08030c920608996eb52cce1068030ffd3b6 /arch
parentc7ec16da5adc1c1b341b2a83bde7add17dcf811a (diff)
downloadop-kernel-dev-d1254b12c93e1e586137a2ffef71fd33cf273f35.zip
op-kernel-dev-d1254b12c93e1e586137a2ffef71fd33cf273f35.tar.gz
uml: fix x86_64 core dump crash
Stop UML crashing when trying to dump a process core on x86_64. This is the minimal fix to stop the crash - more things are broken here, and patches are forthcoming. The immediate thing to do is define ELF_CORE_COPY_REGS and ELF_CORE_COPY_FPREGS. Defining ELF_CORE_COPY_FPREGS allows dump_fpu to go away. It is defined in terms of save_fp_registers, so that needs to be added. 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')
-rw-r--r--arch/um/os-Linux/sys-x86_64/registers.c15
-rw-r--r--arch/um/sys-x86_64/ptrace.c6
2 files changed, 15 insertions, 6 deletions
diff --git a/arch/um/os-Linux/sys-x86_64/registers.c b/arch/um/os-Linux/sys-x86_64/registers.c
index e6fc217..9467315 100644
--- a/arch/um/os-Linux/sys-x86_64/registers.c
+++ b/arch/um/os-Linux/sys-x86_64/registers.c
@@ -4,6 +4,7 @@
*/
#include <errno.h>
+#include <sys/ptrace.h>
#include <string.h>
#include "ptrace_user.h"
#include "uml-config.h"
@@ -17,6 +18,20 @@
static unsigned long exec_regs[MAX_REG_NR];
static unsigned long exec_fp_regs[HOST_FP_SIZE];
+int save_fp_registers(int pid, unsigned long *fp_regs)
+{
+ if(ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
+ return -errno;
+ return 0;
+}
+
+int restore_fp_registers(int pid, unsigned long *fp_regs)
+{
+ if(ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
+ return -errno;
+ return 0;
+}
+
void init_thread_registers(union uml_pt_regs *to)
{
memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
index 55b66e0..1970d78 100644
--- a/arch/um/sys-x86_64/ptrace.c
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -156,12 +156,6 @@ int is_syscall(unsigned long addr)
return(instr == 0x050f);
}
-int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
-{
- panic("dump_fpu");
- return(1);
-}
-
int get_fpregs(unsigned long buf, struct task_struct *child)
{
panic("get_fpregs");
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