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#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <sys/ptrace.h>
#include <asm/ptrace.h>
#include "ltrace.h"
#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
#endif
#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
# define PTRACE_POKEUSER PTRACE_POKEUSR
#endif
/* syscall tracing protocol: ArmLinux
on the way in, ip is 0
on the way out, ip is non-zero
*/
#define off_r0 0
#define off_ip 48
#define off_pc 60
/* Returns 1 if syscall, 2 if sysret, 0 otherwise.
*/
int syscall_p(struct process * proc, int status, int * sysnum)
{
if (WIFSTOPPED(status) && WSTOPSIG(status)==SIGTRAP) {
/* get the user's pc (plus 8) */
int pc = ptrace(PTRACE_PEEKUSER, proc->pid, off_pc, 0);
/* fetch the SWI instruction */
int insn = ptrace(PTRACE_PEEKTEXT, proc->pid, pc-4, 0) ;
*sysnum = insn & 0xFFFF;
/* if it is a syscall, return 1 or 2 */
if ((insn & 0xFFFF0000) == 0xef900000) {
return ptrace(PTRACE_PEEKUSER, proc->pid, off_ip, 0) ? 2 : 1;
}
}
return 0;
}
void continue_after_breakpoint(struct process *proc, struct breakpoint * sbp, int delete_it)
{
delete_breakpoint(proc->pid, sbp);
ptrace(PTRACE_POKEUSER, proc->pid, off_pc, sbp->addr);
if (delete_it) {
continue_process(proc->pid);
} else {
proc->breakpoint_being_enabled = sbp;
ptrace(PTRACE_SINGLESTEP, proc->pid, 0, 0);
}
}
long gimme_arg(enum tof type, struct process * proc, int arg_num)
{
if (arg_num==-1) { /* return value */
return ptrace(PTRACE_PEEKUSER, proc->pid, off_r0, 0);
}
/* deal with the ARM calling conventions */
if (type==LT_TOF_FUNCTION) {
if (arg_num<4) {
return ptrace(PTRACE_PEEKUSER, proc->pid, 4*arg_num, 0);
} else {
return ptrace(PTRACE_PEEKDATA, proc->pid, proc->stack_pointer+4*(arg_num-4), 0);
}
} else if (type==LT_TOF_SYSCALL) {
if (arg_num<5) {
return ptrace(PTRACE_PEEKUSER, proc->pid, 4*arg_num, 0);
} else {
return ptrace(PTRACE_PEEKDATA, proc->pid, proc->stack_pointer+4*(arg_num-5), 0);
}
} else {
fprintf(stderr, "gimme_arg called with wrong arguments\n");
exit(1);
}
return 0;
}
int umovestr(struct process * proc, void * addr, int len, void * laddr)
{
long a;
int i;
int offset=0;
while(offset<len) {
a = ptrace(PTRACE_PEEKTEXT, proc->pid, addr+offset, 0);
for(i=0; i<sizeof(long); i++) {
if (((char*)&a)[i] && offset+i < len) {
*(char *)(laddr+offset+i) = ((char*)&a)[i];
} else {
*(char *)(laddr+offset+i) = '\0';
return 0;
}
}
offset += sizeof(long);
}
*(char *)(laddr+offset) = '\0';
return 0;
}
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