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 syscall_trace(r, 0); 22 23 /* 24 * This should go in the declaration of syscall, but when I do that, 25 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing 26 * children at all, sometimes hanging when bash doesn't see the first 27 * ls exit. 28 * The assembly looks functionally the same to me. This is 29 * gcc version 4.0.1 20050727 (Red Hat 4.0.1-5) 30 * in case it's a compiler bug. 31 */ 32 syscall = UPT_SYSCALL_NR(r); 33 if ((syscall >= NR_SYSCALLS) || (syscall < 0)) 34 result = -ENOSYS; 35 else result = EXECUTE_SYSCALL(syscall, regs); 36 37 REGS_SET_SYSCALL_RETURN(r->gp, result); 38 39 syscall_trace(r, 1); 40 } 41