}
}
+static int
+cmdline_location()
+{
+ if (h8300smode)
+ return 0xffff00L;
+ else if (h8300hmode)
+ return 0x2ff00L;
+ else
+ return 0xff00L;
+}
+
static unsigned int
decode (int addr, unsigned char *data, decoded_inst *dst)
{
case 0xcb:
dst->opcode = O (O_SYS_FSTAT, SB);
break;
+ case 0xcc:
+ dst->opcode = O (O_SYS_CMDLINE, SB);
+ break;
}
/* End of Processing for system calls. */
}
goto condtrue;
goto next;
+ /* Trap for Command Line setup. */
+ case O (O_SYS_CMDLINE, SB):
+ {
+ int i = 0; /* Loop counter. */
+ int j = 0; /* Loop counter. */
+ int ind_arg_len = 0; /* Length of each argument. */
+ int no_of_args = 0; /* The no. or cmdline args. */
+ int current_location = 0; /* Location of string. */
+ int old_sp = 0; /* The Initial Stack Pointer. */
+ int no_of_slots = 0; /* No. of slots required on the stack
+ for storing cmdline args. */
+ int sp_move = 0; /* No. of locations by which the stack needs
+ to grow. */
+ int new_sp = 0; /* The final stack pointer location passed
+ back. */
+ int *argv_ptrs; /* Pointers of argv strings to be stored. */
+ int argv_ptrs_location = 0; /* Location of pointers to cmdline
+ args on the stack. */
+ int char_ptr_size = 0; /* Size of a character pointer on
+ target machine. */
+ int addr_cmdline = 0; /* Memory location where cmdline has
+ to be stored. */
+ int size_cmdline = 0; /* Size of cmdline. */
+
+ /* Set the address of 256 free locations where command line is
+ stored. */
+ addr_cmdline = cmdline_location();
+ cpu.regs[0] = addr_cmdline;
+
+ /* Counting the no. of commandline arguments. */
+ for (i = 0; ptr_command_line[i] != NULL; i++)
+ continue;
+
+ /* No. of arguments in the command line. */
+ no_of_args = i;
+
+ /* Current location is just a temporary variable,which we are
+ setting to the point to the start of our commandline string. */
+ current_location = addr_cmdline;
+
+ /* Allocating space for storing pointers of the command line
+ arguments. */
+ argv_ptrs = (int *) malloc (sizeof (int) * no_of_args);
+
+ /* Setting char_ptr_size to the sizeof (char *) on the different
+ architectures. */
+ if (h8300hmode || h8300smode)
+ {
+ char_ptr_size = 4;
+ }
+ else
+ {
+ char_ptr_size = 2;
+ }
+
+ for (i = 0; i < no_of_args; i++)
+ {
+ ind_arg_len = 0;
+
+ /* The size of the commandline argument. */
+ ind_arg_len = (strlen (ptr_command_line[i]) + 1);
+
+ /* The total size of the command line string. */
+ size_cmdline += ind_arg_len;
+
+ /* As we have only 256 bytes, we need to provide a graceful
+ exit. Anyways, a program using command line arguments
+ where we cannot store all the command line arguments
+ given may behave unpredictably. */
+ if (size_cmdline >= 256)
+ {
+ cpu.regs[0] = 0;
+ goto next;
+ }
+ else
+ {
+ /* current_location points to the memory where the next
+ commandline argument is stored. */
+ argv_ptrs[i] = current_location;
+ for (j = 0; j < ind_arg_len; j++)
+ {
+ SET_MEMORY_B ((current_location +
+ (sizeof (char) * j)),
+ *(ptr_command_line[i] +
+ sizeof (char) * j));
+ }
+
+ /* Setting current_location to the starting of next
+ argument. */
+ current_location += ind_arg_len;
+ }
+ }
+
+ /* This is the original position of the stack pointer. */
+ old_sp = cpu.regs[7];
+
+ /* We need space from the stack to store the pointers to argvs. */
+ /* As we will infringe on the stack, we need to shift the stack
+ pointer so that the data is not overwritten. We calculate how
+ much space is required. */
+ sp_move = (no_of_args) * (char_ptr_size);
+
+ /* The final position of stack pointer, we have thus taken some
+ space from the stack. */
+ new_sp = old_sp - sp_move;
+
+ /* Temporary variable holding value where the argv pointers need
+ to be stored. */
+ argv_ptrs_location = new_sp;
+
+ /* The argv pointers are stored at sequential locations. As per
+ the H8300 ABI. */
+ for (i = 0; i < no_of_args; i++)
+ {
+ /* Saving the argv pointer. */
+ if (h8300hmode || h8300smode)
+ {
+ SET_MEMORY_L (argv_ptrs_location, argv_ptrs[i]);
+ }
+ else
+ {
+ SET_MEMORY_W (argv_ptrs_location, argv_ptrs[i]);
+ }
+
+ /* The next location where the pointer to the next argv
+ string has to be stored. */
+ argv_ptrs_location += char_ptr_size;
+ }
+
+ /* Required by POSIX, Setting 0x0 at the end of the list of argv
+ pointers. */
+ if (h8300hmode || h8300smode)
+ {
+ SET_MEMORY_L (old_sp, 0x0);
+ }
+ else
+ {
+ SET_MEMORY_W (old_sp, 0x0);
+ }
+
+ /* Freeing allocated memory. */
+ free (argv_ptrs);
+ for (i = 0; i <= no_of_args; i++)
+ {
+ free (ptr_command_line[i]);
+ }
+ free (ptr_command_line);
+
+ /* The no. of argv arguments are returned in Reg 0. */
+ cpu.regs[0] = no_of_args;
+ /* The Pointer to argv in Register 1. */
+ cpu.regs[1] = new_sp;
+ /* Setting the stack pointer to the new value. */
+ cpu.regs[7] = new_sp;
+ }
+ goto next;
+
/* System call processing starts. */
case O (O_SYS_OPEN, SB):
{
SIM_RC
sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env)
{
+ int i = 0;
+ int len_arg = 0;
+ int no_of_args = 0;
+
if (abfd != NULL)
cpu.pc = bfd_get_start_address (abfd);
else
cpu.pc = 0;
+
+ /* Command Line support. */
+ if (argv != NULL)
+ {
+ /* Counting the no. of commandline arguments. */
+ for (no_of_args = 0; argv[no_of_args] != NULL; no_of_args++)
+ continue;
+
+ /* Allocating memory for the argv pointers. */
+ ptr_command_line = (char **) malloc ((sizeof (char *))
+ * (no_of_args + 1));
+
+ for (i = 0; i < no_of_args; i++)
+ {
+ /* Calculating the length of argument for allocating memory. */
+ len_arg = strlen (argv[i] + 1);
+ ptr_command_line[i] = (char *) malloc (sizeof (char) * len_arg);
+ /* Copying the argument string. */
+ ptr_command_line[i] = (char *) strdup (argv[i]);
+ }
+ ptr_command_line[i] = NULL;
+ }
+
return SIM_RC_OK;
}
projects / binutils-gdb.git / commitdiff