1 /* 2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/ptrace.h> 8 #include <kern_util.h> 9 #include <sysdep/ptrace.h> 10 #include <sysdep/syscalls.h> 11 12 extern int syscall_table_size; 13 #define NR_SYSCALLS (syscall_table_size / sizeof(void *)) 14 15 void handle_syscall(struct uml_pt_regs *r) 16 { 17 struct pt_regs *regs = container_of(r, struct pt_regs, regs); 18 long result; 19 int syscall; 20 21 if (syscall_trace_enter(regs)) { 22 result = -ENOSYS; 23 goto out; 24 } 25 26 /* 27 * This should go in the declaration of syscall, but when I do that, 28 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing 29 * children at all, sometimes hanging when bash doesn't see the first 30 * ls exit. 31 * The assembly looks functionally the same to me. This is 32 * gcc version 4.0.1 20050727 (Red Hat 4.0.1-5) 33 * in case it's a compiler bug. 34 */ 35 syscall = UPT_SYSCALL_NR(r); 36 if ((syscall >= NR_SYSCALLS) || (syscall < 0)) 37 result = -ENOSYS; 38 else result = EXECUTE_SYSCALL(syscall, regs); 39 40 out: 41 PT_REGS_SET_SYSCALL_RETURN(regs, result); 42 43 syscall_trace_leave(regs); 44 } 45