Adds a .step command

asmsh.h

@@ -108,7 +108,6 @@ asmsh@0x7f6e312e5022 >
 
 @section TODO TODOLIST
 
-@todo Implement a .step instruction allowing to step without compiling any instruction
 @todo Implement breakpoints
 @todo Implement symbols for jumps
 @todo Implement write without exec

shell_cmds.c

@@ -280,6 +280,20 @@ flags: %c%c%c%c|%c%c%c\n\
 	return 0;
 }
 
+
+int asmsh_cmd_step(asmsh_t *sh, asmsh_cmd_args_t *args)
+{
+	int ret, status;
+	ret = asmsh_env_step(sh->env, &status);
+
+	if(ret > 1)
+	{
+		return status;
+	}
+	return ret;
+}
+
+
 int asmsh_cmd_syscalls(asmsh_t *sh, asmsh_cmd_args_t *args)
 {
 	const int sz = sizeof(syscall_infos)/sizeof(*syscall_infos);

shell_cmds.h

@@ -31,6 +31,7 @@
 typedef struct asmsh_cmd_s asmsh_cmd_t;
 typedef struct asmsh_cmd_args_s asmsh_cmd_args_t;
 #include "shell.h"
+#include "asm_env.h"
 
 /** @return <0 on recoverable error 0 on ok, 1+status on exit */
 typedef int (asmsh_cmd_f)(asmsh_t*, asmsh_cmd_args_t*);
@@ -98,6 +99,8 @@ int asmsh_cmd_maps(asmsh_t *sh, asmsh_cmd_args_t *args);
 
 int asmsh_cmd_print_regs(asmsh_t *sh, asmsh_cmd_args_t *args);
 
+int asmsh_cmd_step(asmsh_t *sh, asmsh_cmd_args_t *args);
+
 int asmsh_cmd_syscalls(asmsh_t *sh, asmsh_cmd_args_t *args);
 
 // Reset the shell (restart the child etc)a
@@ -131,8 +134,11 @@ static const asmsh_cmd_t asmsh_CMDS[] = {
 	{".regs", asmsh_cmd_print_regs, 1,
 	".(regs)", "",
 	"display registers value"},
-	{".syscalls", asmsh_cmd_syscalls, 2,
-	 ".s(yscalls)", "",
+	{".step", asmsh_cmd_step, 2,
+	 ".s(tep)", "",
+	 "Run the instruction pointed by RIP"},
+	{".syscalls", asmsh_cmd_syscalls, 4,
+	 ".sys(calls)", "",
 	 "print syscalls name & numbers"},
 	{".reset", asmsh_cmd_reset, 0,
 	 ".reset", "",