1 /* 2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/sys.h" 7 #include "linux/ptrace.h" 8 #include "asm/errno.h" 9 #include "asm/unistd.h" 10 #include "asm/ptrace.h" 11 #include "asm/current.h" 12 #include "sysdep/syscalls.h" 13 #include "kern_util.h" 14 #include "syscall.h" 15 16 void handle_syscall(union uml_pt_regs *r) 17 { 18 struct pt_regs *regs = container_of(r, struct pt_regs, regs); 19 long result; 20 int syscall; 21 #ifdef UML_CONFIG_SYSCALL_DEBUG 22 int index; 23 24 index = record_syscall_start(UPT_SYSCALL_NR(r)); 25 #endif 26 syscall_trace(r, 0); 27 28 current->thread.nsyscalls++; 29 nsyscalls++; 30 31 /* This should go in the declaration of syscall, but when I do that, 32 * strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing 33 * children at all, sometimes hanging when bash doesn't see the first 34 * ls exit. 35 * The assembly looks functionally the same to me. This is 36 * gcc version 4.0.1 20050727 (Red Hat 4.0.1-5) 37 * in case it's a compiler bug. 38 */ 39 syscall = UPT_SYSCALL_NR(r); 40 if((syscall >= NR_syscalls) || (syscall < 0)) 41 result = -ENOSYS; 42 else result = EXECUTE_SYSCALL(syscall, regs); 43 44 REGS_SET_SYSCALL_RETURN(r->skas.regs, result); 45 46 syscall_trace(r, 1); 47 #ifdef UML_CONFIG_SYSCALL_DEBUG 48 record_syscall_end(index, result); 49 #endif 50 } 51