1 files changed, 104 insertions, 0 deletions
diff --git a/sysdeps/Linux/arm/trace.c b/sysdeps/Linux/arm/trace.c
new file mode 100644
index 0000000..95d2c47
--- /dev/null
+++ b/sysdeps/Linux/arm/trace.c
@@ -0,0 +1,104 @@
+#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;
+}