From: Benjamin Berg benjamin.berg@intel.com
The registers.c file only contain the routines for floating point register access in ptrace mode and initial size detection. The file can be moved over to nolibc by replacing the ptrace libc call with a simple wrapper that does a direct syscall.
Signed-off-by: Benjamin Berg benjamin.berg@intel.com --- arch/x86/um/os-Linux/Makefile | 5 ++++- arch/x86/um/os-Linux/registers.c | 22 ++++++++-------------- 2 files changed, 12 insertions(+), 15 deletions(-)
diff --git a/arch/x86/um/os-Linux/Makefile b/arch/x86/um/os-Linux/Makefile index 77a308aaa5ec..d37320430822 100644 --- a/arch/x86/um/os-Linux/Makefile +++ b/arch/x86/um/os-Linux/Makefile @@ -3,10 +3,13 @@ # Licensed under the GPL #
-obj-y = registers.o mcontext.o +obj-y = mcontext.o
obj-$(CONFIG_X86_32) += tls.o
USER_OBJS := $(obj-y)
+obj-y += registers.o +NOLIBC_OBJS := registers.o + include $(srctree)/arch/um/scripts/Makefile.rules diff --git a/arch/x86/um/os-Linux/registers.c b/arch/x86/um/os-Linux/registers.c index eb1cdadc8a61..55bce0d3f5d2 100644 --- a/arch/x86/um/os-Linux/registers.c +++ b/arch/x86/um/os-Linux/registers.c @@ -6,18 +6,20 @@
#include <errno.h> #include <stdlib.h> -#include <sys/ptrace.h> +#include <linux/ptrace.h> #ifdef __i386__ #include <sys/user.h> #endif #include <longjmp.h> #include <sysdep/ptrace_user.h> -#include <sys/uio.h> +#include <linux/uio.h> #include <asm/sigcontext.h> #include <linux/elf.h> #include <registers.h> #include <sys/mman.h>
+#define my_ptrace(...) my_syscall4(__NR_ptrace, __VA_ARGS__) + static unsigned long ptrace_regset; unsigned long host_fp_size;
@@ -28,9 +30,7 @@ int get_fp_registers(int pid, unsigned long *regs) .iov_len = host_fp_size, };
- if (ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov) < 0) - return -errno; - return 0; + return my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); }
int put_fp_registers(int pid, unsigned long *regs) @@ -40,9 +40,7 @@ int put_fp_registers(int pid, unsigned long *regs) .iov_len = host_fp_size, };
- if (ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov) < 0) - return -errno; - return 0; + return my_ptrace(PTRACE_SETREGSET, pid, ptrace_regset, &iov); }
int arch_init_registers(int pid) @@ -60,9 +58,7 @@ int arch_init_registers(int pid)
/* GDB has x86_xsave_length, which uses x86_cpuid_count */ ptrace_regset = NT_X86_XSTATE; - ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); - if (ret) - ret = -errno; + ret = my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov);
if (ret == -ENODEV) { #ifdef CONFIG_X86_32 @@ -71,9 +67,7 @@ int arch_init_registers(int pid) ptrace_regset = NT_PRFPREG; #endif iov.iov_len = 2 * 1024 * 1024; - ret = ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); - if (ret) - ret = -errno; + ret = my_ptrace(PTRACE_GETREGSET, pid, ptrace_regset, &iov); }
munmap(iov.iov_base, 2 * 1024 * 1024);