static CORE_ADDR
arm_linux_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
char *fp;
int argnum, argreg, nstack_size;
/* Walk through the list of args and determine how large a temporary
stack is required. Need to take care here as structs may be
passed on the stack, and we have to to push them. */
nstack_size = -4 * REGISTER_SIZE; /* Some arguments go into A1-A4. */
if (struct_return) /* The struct address goes in A1. */
nstack_size += REGISTER_SIZE;
/* Walk through the arguments and add their size to nstack_size. */
for (argnum = 0; argnum < nargs; argnum++)
{
int len;
struct type *arg_type;
arg_type = check_typedef (VALUE_TYPE (args[argnum]));
len = TYPE_LENGTH (arg_type);
/* ANSI C code passes float arguments as integers, K&R code
passes float arguments as doubles. Correct for this here. */
if (TYPE_CODE_FLT == TYPE_CODE (arg_type) && REGISTER_SIZE == len)
nstack_size += FP_REGISTER_VIRTUAL_SIZE;
else
nstack_size += len;
}
/* Allocate room on the stack, and initialize our stack frame
pointer. */
fp = NULL;
if (nstack_size > 0)
{
sp -= nstack_size;
fp = (char *) sp;
}
/* Initialize the integer argument register pointer. */
argreg = ARM_A1_REGNUM;
/* The struct_return pointer occupies the first parameter passing
register. */
if (struct_return)
write_register (argreg++, struct_addr);
/* Process arguments from left to right. Store as many as allowed
in the parameter passing registers (A1-A4), and save the rest on
the temporary stack. */
for (argnum = 0; argnum < nargs; argnum++)
{
int len;
char *val;
CORE_ADDR regval;
enum type_code typecode;
struct type *arg_type, *target_type;
arg_type = check_typedef (VALUE_TYPE (args[argnum]));
target_type = TYPE_TARGET_TYPE (arg_type);
len = TYPE_LENGTH (arg_type);
typecode = TYPE_CODE (arg_type);
val = (char *) VALUE_CONTENTS (args[argnum]);
/* ANSI C code passes float arguments as integers, K&R code
passes float arguments as doubles. The .stabs record for
for ANSI prototype floating point arguments records the
type as FP_INTEGER, while a K&R style (no prototype)
.stabs records the type as FP_FLOAT. In this latter case
the compiler converts the float arguments to double before
calling the function. */
if (TYPE_CODE_FLT == typecode && REGISTER_SIZE == len)
{
DOUBLEST dblval;
dblval = extract_floating (val, len);
len = TARGET_DOUBLE_BIT / TARGET_CHAR_BIT;
val = alloca (len);
store_floating (val, len, dblval);
}
/* If the argument is a pointer to a function, and it is a Thumb
function, set the low bit of the pointer. */
if (TYPE_CODE_PTR == typecode
&& NULL != target_type
&& TYPE_CODE_FUNC == TYPE_CODE (target_type))
{
CORE_ADDR regval = extract_address (val, len);
if (arm_pc_is_thumb (regval))
store_address (val, len, MAKE_THUMB_ADDR (regval));
}
/* Copy the argument to general registers or the stack in
register-sized pieces. Large arguments are split between
registers and stack. */
while (len > 0)
{
int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
if (argreg <= ARM_LAST_ARG_REGNUM)
{
/* It's an argument being passed in a general register. */
regval = extract_address (val, partial_len);
write_register (argreg++, regval);
}
else
{
/* Push the arguments onto the stack. */
write_memory ((CORE_ADDR) fp, val, REGISTER_SIZE);
fp += REGISTER_SIZE;
}
len -= partial_len;
val += partial_len;
}
}
/* Return adjusted stack pointer. */
return sp;
}
void
generic_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp,
struct frame_info *frame, int regnum,
enum lval_type *lval)
{
if (!target_has_registers)
error ("No registers.");
/* Normal systems don't optimize out things with register numbers. */
if (optimized != NULL)
*optimized = 0;
if (addrp) /* default assumption: not found in memory */
*addrp = 0;
/* Note: since the current frame's registers could only have been
saved by frames INTERIOR TO the current frame, we skip examining
the current frame itself: otherwise, we would be getting the
previous frame's registers which were saved by the current frame. */
while (frame && ((frame = frame->next) != NULL))
{
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
{
if (lval) /* found it in a CALL_DUMMY frame */
*lval = not_lval;
if (raw_buffer)
memcpy (raw_buffer,
generic_find_dummy_frame (frame->pc, frame->frame) +
REGISTER_BYTE (regnum),
REGISTER_RAW_SIZE (regnum));
return;
}
FRAME_INIT_SAVED_REGS (frame);
if (frame->saved_regs != NULL
&& frame->saved_regs[regnum] != 0)
{
if (lval) /* found it saved on the stack */
*lval = lval_memory;
if (regnum == SP_REGNUM)
{
if (raw_buffer) /* SP register treated specially */
store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
frame->saved_regs[regnum]);
}
else
{
if (addrp) /* any other register */
*addrp = frame->saved_regs[regnum];
if (raw_buffer)
read_memory (frame->saved_regs[regnum], raw_buffer,
REGISTER_RAW_SIZE (regnum));
}
return;
}
}
/* If we get thru the loop to this point, it means the register was
not saved in any frame. Return the actual live-register value. */
if (lval) /* found it in a live register */
*lval = lval_register;
if (addrp)
*addrp = REGISTER_BYTE (regnum);
if (raw_buffer)
read_register_gen (regnum, raw_buffer);
}
