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* arm-tdep.c (arm_push_arguments): Delete.
(struct stack_item): New type. (push_stack_item, pop_stack_item, arm_push_dummy_call): New functions. (arm_store_struct_return): Delte. (arm_gdbarch_init): Register arm_push_dummy_call. Don't register arm_push_arguments or arm_store_struct_return.
This commit is contained in:
Richard Earnshaw
parent
e8933a55f2
commit
2dd604e7ef
@ -1,3 +1,12 @@
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2003-03-29 Richard Earnshaw <rearnsha@arm.com>
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* arm-tdep.c (arm_push_arguments): Delete.
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(struct stack_item): New type.
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(push_stack_item, pop_stack_item, arm_push_dummy_call): New functions.
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(arm_store_struct_return): Delte.
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(arm_gdbarch_init): Register arm_push_dummy_call. Don't register
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arm_push_arguments or arm_store_struct_return.
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2003-03-28 Andrew Cagney <cagney@redhat.com>
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* Makefile.in (d10v-tdep.o): Update dependencies.
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299
gdb/arm-tdep.c
299
gdb/arm-tdep.c
@ -1334,137 +1334,6 @@ arm_fix_call_dummy (char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs,
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write_register (4, fun);
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}
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/* Note: ScottB
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This function does not support passing parameters using the FPA
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variant of the APCS. It passes any floating point arguments in the
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general registers and/or on the stack. */
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static CORE_ADDR
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arm_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
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int struct_return, CORE_ADDR struct_addr)
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{
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CORE_ADDR fp;
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int argnum;
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int argreg;
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int nstack;
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int simd_argreg;
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int second_pass;
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struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
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/* Walk through the list of args and determine how large a temporary
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stack is required. Need to take care here as structs may be
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passed on the stack, and we have to to push them. On the second
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pass, do the store. */
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nstack = 0;
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fp = sp;
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for (second_pass = 0; second_pass < 2; second_pass++)
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{
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/* Compute the FP using the information computed during the
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first pass. */
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if (second_pass)
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fp = sp - nstack;
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simd_argreg = 0;
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argreg = ARM_A1_REGNUM;
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nstack = 0;
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/* The struct_return pointer occupies the first parameter
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passing register. */
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if (struct_return)
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{
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if (second_pass)
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{
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog,
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"struct return in %s = 0x%s\n",
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REGISTER_NAME (argreg),
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paddr (struct_addr));
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write_register (argreg, struct_addr);
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}
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argreg++;
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}
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for (argnum = 0; argnum < nargs; argnum++)
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{
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int len;
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struct type *arg_type;
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struct type *target_type;
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enum type_code typecode;
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char *val;
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arg_type = check_typedef (VALUE_TYPE (args[argnum]));
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len = TYPE_LENGTH (arg_type);
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target_type = TYPE_TARGET_TYPE (arg_type);
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typecode = TYPE_CODE (arg_type);
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val = VALUE_CONTENTS (args[argnum]);
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/* If the argument is a pointer to a function, and it is a
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Thumb function, create a LOCAL copy of the value and set
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the THUMB bit in it. */
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if (second_pass
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&& TYPE_CODE_PTR == typecode
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&& target_type != NULL
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&& TYPE_CODE_FUNC == TYPE_CODE (target_type))
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{
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CORE_ADDR regval = extract_address (val, len);
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if (arm_pc_is_thumb (regval))
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{
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val = alloca (len);
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store_address (val, len, MAKE_THUMB_ADDR (regval));
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}
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}
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/* Copy the argument to general registers or the stack in
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register-sized pieces. Large arguments are split between
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registers and stack. */
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while (len > 0)
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{
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int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
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if (argreg <= ARM_LAST_ARG_REGNUM)
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{
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/* The argument is being passed in a general purpose
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register. */
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if (second_pass)
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{
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CORE_ADDR regval = extract_address (val,
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partial_len);
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog,
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"arg %d in %s = 0x%s\n",
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argnum,
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REGISTER_NAME (argreg),
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phex (regval, REGISTER_SIZE));
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write_register (argreg, regval);
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}
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argreg++;
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}
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else
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{
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if (second_pass)
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{
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/* Push the arguments onto the stack. */
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog,
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"arg %d @ 0x%s + %d\n",
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argnum, paddr (fp), nstack);
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write_memory (fp + nstack, val, REGISTER_SIZE);
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}
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nstack += REGISTER_SIZE;
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}
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len -= partial_len;
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val += partial_len;
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}
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}
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}
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/* Return the bottom of the argument list (pointed to by fp). */
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return fp;
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}
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/* Pop the current frame. So long as the frame info has been
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initialized properly (see arm_init_extra_frame_info), this code
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works for dummy frames as well as regular frames. I.e, there's no
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@ -1499,6 +1368,161 @@ arm_pop_frame (void)
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flush_cached_frames ();
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}
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/* When arguments must be pushed onto the stack, they go on in reverse
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order. The code below implements a FILO (stack) to do this. */
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struct stack_item
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{
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int len;
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struct stack_item *prev;
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void *data;
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};
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static struct stack_item *
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push_stack_item (struct stack_item *prev, void *contents, int len)
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{
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struct stack_item *si;
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si = xmalloc (sizeof (struct stack_item));
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si->data = malloc (len);
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si->len = len;
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si->prev = prev;
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memcpy (si->data, contents, len);
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return si;
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}
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static struct stack_item *
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pop_stack_item (struct stack_item *si)
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{
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struct stack_item *dead = si;
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si = si->prev;
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xfree (dead->data);
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xfree (dead);
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return si;
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}
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/* We currently only support passing parameters in integer registers. This
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conforms with GCC's default model. Several other variants exist and
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we should probably support some of them based on the selected ABI. */
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static CORE_ADDR
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arm_push_dummy_call (struct gdbarch *gdbarch, struct regcache *regcache,
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CORE_ADDR dummy_addr, int nargs, struct value **args,
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CORE_ADDR sp, int struct_return, CORE_ADDR struct_addr)
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{
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int argnum;
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int argreg;
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int nstack;
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struct stack_item *si = NULL;
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/* Set the return address. For the ARM, the return breakpoint is always
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at DUMMY_ADDR. */
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/* XXX Fix for Thumb. */
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regcache_cooked_write_unsigned (regcache, ARM_LR_REGNUM, dummy_addr);
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/* Walk through the list of args and determine how large a temporary
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stack is required. Need to take care here as structs may be
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passed on the stack, and we have to to push them. */
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nstack = 0;
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argreg = ARM_A1_REGNUM;
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nstack = 0;
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/* Some platforms require a double-word aligned stack. Make sure sp
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is correctly aligned before we start. We always do this even if
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it isn't really needed -- it can never hurt things. */
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sp &= ~(CORE_ADDR)(2 * REGISTER_SIZE - 1);
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/* The struct_return pointer occupies the first parameter
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passing register. */
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if (struct_return)
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{
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog, "struct return in %s = 0x%s\n",
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REGISTER_NAME (argreg), paddr (struct_addr));
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regcache_cooked_write_unsigned (regcache, argreg, struct_addr);
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argreg++;
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}
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for (argnum = 0; argnum < nargs; argnum++)
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{
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int len;
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struct type *arg_type;
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struct type *target_type;
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enum type_code typecode;
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char *val;
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arg_type = check_typedef (VALUE_TYPE (args[argnum]));
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len = TYPE_LENGTH (arg_type);
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target_type = TYPE_TARGET_TYPE (arg_type);
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typecode = TYPE_CODE (arg_type);
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val = VALUE_CONTENTS (args[argnum]);
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/* If the argument is a pointer to a function, and it is a
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Thumb function, create a LOCAL copy of the value and set
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the THUMB bit in it. */
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if (TYPE_CODE_PTR == typecode
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&& target_type != NULL
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&& TYPE_CODE_FUNC == TYPE_CODE (target_type))
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{
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CORE_ADDR regval = extract_address (val, len);
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if (arm_pc_is_thumb (regval))
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{
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val = alloca (len);
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store_address (val, len, MAKE_THUMB_ADDR (regval));
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}
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}
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/* Copy the argument to general registers or the stack in
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register-sized pieces. Large arguments are split between
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registers and stack. */
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while (len > 0)
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{
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int partial_len = len < REGISTER_SIZE ? len : REGISTER_SIZE;
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if (argreg <= ARM_LAST_ARG_REGNUM)
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{
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/* The argument is being passed in a general purpose
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register. */
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CORE_ADDR regval = extract_address (val, partial_len);
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog, "arg %d in %s = 0x%s\n",
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argnum, REGISTER_NAME (argreg),
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phex (regval, REGISTER_SIZE));
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regcache_cooked_write_unsigned (regcache, argreg, regval);
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argreg++;
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}
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else
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{
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/* Push the arguments onto the stack. */
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if (arm_debug)
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fprintf_unfiltered (gdb_stdlog, "arg %d @ sp + %d\n",
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argnum, nstack);
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si = push_stack_item (si, val, REGISTER_SIZE);
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nstack += REGISTER_SIZE;
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}
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len -= partial_len;
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val += partial_len;
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}
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}
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/* If we have an odd number of words to push, then decrement the stack
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by one word now, so first stack argument will be dword aligned. */
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if (nstack & 4)
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sp -= 4;
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while (si)
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{
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sp -= si->len;
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write_memory (sp, si->data, si->len);
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si = pop_stack_item (si);
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}
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/* Finally, update teh SP register. */
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regcache_cooked_write_unsigned (regcache, ARM_SP_REGNUM, sp);
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return sp;
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}
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static void
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print_fpu_flags (int flags)
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{
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@ -2456,15 +2480,6 @@ arm_store_return_value (struct type *type, struct regcache *regs,
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}
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}
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/* Store the address of the place in which to copy the structure the
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subroutine will return. This is called from call_function. */
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static void
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arm_store_struct_return (CORE_ADDR addr, CORE_ADDR sp)
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{
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write_register (ARM_A1_REGNUM, addr);
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}
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static int
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arm_get_longjmp_target (CORE_ADDR *pc)
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{
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@ -2929,8 +2944,7 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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set_gdbarch_call_dummy_address (gdbarch, entry_point_address);
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set_gdbarch_push_return_address (gdbarch, arm_push_return_address);
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set_gdbarch_deprecated_push_arguments (gdbarch, arm_push_arguments);
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set_gdbarch_push_dummy_call (gdbarch, arm_push_dummy_call);
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/* Frame handling. */
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set_gdbarch_deprecated_frame_chain_valid (gdbarch, arm_frame_chain_valid);
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@ -2994,7 +3008,6 @@ arm_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
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/* Returning results. */
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set_gdbarch_extract_return_value (gdbarch, arm_extract_return_value);
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set_gdbarch_store_return_value (gdbarch, arm_store_return_value);
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set_gdbarch_deprecated_store_struct_return (gdbarch, arm_store_struct_return);
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set_gdbarch_use_struct_convention (gdbarch, arm_use_struct_convention);
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set_gdbarch_extract_struct_value_address (gdbarch,
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arm_extract_struct_value_address);
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