| /********************************************************************** |
| ptrace.c |
| |
| Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing |
| terms and conditions. |
| |
| Jeff Dike (jdike@karaya.com) : Modified for integration into uml |
| **********************************************************************/ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include <sys/types.h> |
| #include <sys/time.h> |
| #include <sys/wait.h> |
| |
| #include "ptproxy.h" |
| #include "debug.h" |
| #include "user_util.h" |
| #include "kern_util.h" |
| #include "ptrace_user.h" |
| #include "tt.h" |
| |
| long proxy_ptrace(struct debugger *debugger, int arg1, pid_t arg2, |
| long arg3, long arg4, pid_t child, int *ret) |
| { |
| sigset_t relay; |
| long result; |
| int status; |
| |
| *ret = 0; |
| if(debugger->debugee->died) return(-ESRCH); |
| |
| switch(arg1){ |
| case PTRACE_ATTACH: |
| if(debugger->debugee->traced) return(-EPERM); |
| |
| debugger->debugee->pid = arg2; |
| debugger->debugee->traced = 1; |
| |
| if(is_valid_pid(arg2) && (arg2 != child)){ |
| debugger->debugee->in_context = 0; |
| kill(arg2, SIGSTOP); |
| debugger->debugee->event = 1; |
| debugger->debugee->wait_status = W_STOPCODE(SIGSTOP); |
| } |
| else { |
| debugger->debugee->in_context = 1; |
| if(debugger->debugee->stopped) |
| child_proxy(child, W_STOPCODE(SIGSTOP)); |
| else kill(child, SIGSTOP); |
| } |
| |
| return(0); |
| |
| case PTRACE_DETACH: |
| if(!debugger->debugee->traced) return(-EPERM); |
| |
| debugger->debugee->traced = 0; |
| debugger->debugee->pid = 0; |
| if(!debugger->debugee->in_context) |
| kill(child, SIGCONT); |
| |
| return(0); |
| |
| case PTRACE_CONT: |
| if(!debugger->debugee->in_context) return(-EPERM); |
| *ret = PTRACE_CONT; |
| return(ptrace(PTRACE_CONT, child, arg3, arg4)); |
| |
| #ifdef UM_HAVE_GETFPREGS |
| case PTRACE_GETFPREGS: |
| { |
| long regs[FP_FRAME_SIZE]; |
| int i, result; |
| |
| result = ptrace(PTRACE_GETFPREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i, |
| regs[i]); |
| return(result); |
| } |
| #endif |
| |
| #ifdef UM_HAVE_GETFPXREGS |
| case PTRACE_GETFPXREGS: |
| { |
| long regs[FPX_FRAME_SIZE]; |
| int i, result; |
| |
| result = ptrace(PTRACE_GETFPXREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i, |
| regs[i]); |
| return(result); |
| } |
| #endif |
| |
| #ifdef UM_HAVE_GETREGS |
| case PTRACE_GETREGS: |
| { |
| long regs[FRAME_SIZE]; |
| int i, result; |
| |
| result = ptrace(PTRACE_GETREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| ptrace (PTRACE_POKEDATA, debugger->pid, |
| arg4 + 4 * i, regs[i]); |
| return(result); |
| } |
| break; |
| #endif |
| |
| case PTRACE_KILL: |
| result = ptrace(PTRACE_KILL, child, arg3, arg4); |
| if(result == -1) return(-errno); |
| |
| return(result); |
| |
| case PTRACE_PEEKDATA: |
| case PTRACE_PEEKTEXT: |
| case PTRACE_PEEKUSR: |
| /* The value being read out could be -1, so we have to |
| * check errno to see if there's an error, and zero it |
| * beforehand so we're not faked out by an old error |
| */ |
| |
| errno = 0; |
| result = ptrace(arg1, child, arg3, 0); |
| if((result == -1) && (errno != 0)) return(-errno); |
| |
| result = ptrace(PTRACE_POKEDATA, debugger->pid, arg4, result); |
| if(result == -1) return(-errno); |
| |
| return(result); |
| |
| case PTRACE_POKEDATA: |
| case PTRACE_POKETEXT: |
| case PTRACE_POKEUSR: |
| result = ptrace(arg1, child, arg3, arg4); |
| if(result == -1) return(-errno); |
| |
| if(arg1 == PTRACE_POKEUSR) ptrace_pokeuser(arg3, arg4); |
| return(result); |
| |
| #ifdef UM_HAVE_SETFPREGS |
| case PTRACE_SETFPREGS: |
| { |
| long regs[FP_FRAME_SIZE]; |
| int i; |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid, |
| arg4 + 4 * i, 0); |
| result = ptrace(PTRACE_SETFPREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| return(result); |
| } |
| #endif |
| |
| #ifdef UM_HAVE_SETFPXREGS |
| case PTRACE_SETFPXREGS: |
| { |
| long regs[FPX_FRAME_SIZE]; |
| int i; |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid, |
| arg4 + 4 * i, 0); |
| result = ptrace(PTRACE_SETFPXREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| return(result); |
| } |
| #endif |
| |
| #ifdef UM_HAVE_SETREGS |
| case PTRACE_SETREGS: |
| { |
| long regs[FRAME_SIZE]; |
| int i; |
| |
| for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| regs[i] = ptrace(PTRACE_PEEKDATA, debugger->pid, |
| arg4 + 4 * i, 0); |
| result = ptrace(PTRACE_SETREGS, child, 0, regs); |
| if(result == -1) return(-errno); |
| |
| return(result); |
| } |
| #endif |
| |
| case PTRACE_SINGLESTEP: |
| if(!debugger->debugee->in_context) return(-EPERM); |
| sigemptyset(&relay); |
| sigaddset(&relay, SIGSEGV); |
| sigaddset(&relay, SIGILL); |
| sigaddset(&relay, SIGBUS); |
| result = ptrace(PTRACE_SINGLESTEP, child, arg3, arg4); |
| if(result == -1) return(-errno); |
| |
| status = wait_for_stop(child, SIGTRAP, PTRACE_SINGLESTEP, |
| &relay); |
| child_proxy(child, status); |
| return(result); |
| |
| case PTRACE_SYSCALL: |
| if(!debugger->debugee->in_context) return(-EPERM); |
| result = ptrace(PTRACE_SYSCALL, child, arg3, arg4); |
| if(result == -1) return(-errno); |
| |
| *ret = PTRACE_SYSCALL; |
| return(result); |
| |
| case PTRACE_TRACEME: |
| default: |
| return(-EINVAL); |
| } |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-file-style: "linux" |
| * End: |
| */ |