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* sparc-tdep.c (sparc32_do_push_arguments): New function.

Browse source 
(sparc32_push_arguments): Re-implement by calling
sparc32_do_push_arguments.
This commit is contained in:
Mark Kettenis 2003-05-25 15:47:26 +00:00
parent 493e6a13fd
commit eb2c22dc71
2 changed files with 137 additions and 57 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2003-05-25 Mark Kettenis <kettenis@gnu.org>
* sparc-tdep.c (sparc32_do_push_arguments): New function.
(sparc32_push_arguments): Re-implement by calling
sparc32_do_push_arguments.
2003-05-25 Mark Kettenis <kettenis@gnu.org>
* sparc-tdep.c (SPARC_F0_REGNUM, SPARC_F1_REGNUM, SPARC_O0_REGNUM,

188
gdb/sparc-tdep.c
View file

@ -2207,6 +2207,124 @@ gdb_print_insn_sparc (bfd_vma memaddr, disassemble_info *info)
return print_insn_sparc (memaddr, info);
}
#define SPARC_F0_REGNUM FP0_REGNUM /* %f0 */
#define SPARC_F1_REGNUM (FP0_REGNUM + 1)/* %f1 */
#define SPARC_O0_REGNUM O0_REGNUM /* %o0 */
#define SPARC_O1_REGNUM O1_REGNUM /* %o1 */
/* Push the arguments onto the stack and into the appropriate registers. */
static CORE_ADDR
sparc32_do_push_arguments (struct regcache *regcache, int nargs,
struct value **args, CORE_ADDR sp)
{
CORE_ADDR *addr;
int size = 0;
int i;
/* Structure, union and quad-precision arguments are passed by
reference. We allocate space for these arguments on the stack
and record their addresses in an array. Array elements for
arguments that are passed by value will be set to zero.*/
addr = alloca (nargs * sizeof (CORE_ADDR));
for (i = nargs - 1; i >= 0; i--)
{
struct type *type = VALUE_ENCLOSING_TYPE (args[i]);
enum type_code code = TYPE_CODE (type);
int len = TYPE_LENGTH (type);
/* Push the contents of structure, union and quad-precision
arguments on the stack. */
if (code == TYPE_CODE_STRUCT || code == TYPE_CODE_UNION || len > 8)
{
/* Keep the stack doubleword aligned. */
sp -= (len + 7) & ~7;
write_memory (sp, VALUE_CONTENTS_ALL (args[i]), len);
addr[i] = sp;
size += 4;
}
else
{
addr[i] = 0;
size += (len > 4) ? 8 : 4;
}
}
/* The needed space for outgoing arguments should be a multiple of 4. */
gdb_assert (size % 4 == 0);
/* Make sure we reserve space for the first six words of arguments
in the stack frame, even if we don't need them. */
if (size < 24)
sp -= (24 - size);
/* Make sure we end up with a doubleword aligned stack in the end.
Reserve an extra word if necessary in order to accomplish this. */
if ((sp - size) % 8 == 0)
sp -= 4;
/* Now push the arguments onto the stack. */
for (i = nargs - 1; i >=0; i--)
{
char buf[8];
int len;
if (addr[i])
{
store_unsigned_integer (buf, 4, addr[i]);
len = 4;
}
else
{
struct value *arg = args[i];
len = TYPE_LENGTH (VALUE_ENCLOSING_TYPE (arg));
/* Expand signed and unsigned bytes and halfwords as needed. */
if (len < 4)
{
arg = value_cast (builtin_type_long, arg);
len = 4;
}
else if (len > 4 && len < 8)
{
arg = value_cast (builtin_type_long_long, arg);
len = 4;
}
gdb_assert (len == 4 || len == 8);
memcpy (buf, VALUE_CONTENTS_ALL (arg), len);
}
/* We always write the argument word on the stack. */
sp -= len;
write_memory (sp, buf, len);
/* If this argument occupies one of the first 6 words, write it
into the appropriate register too. */
size -= len;
if (size < 24)
{
int regnum = SPARC_O0_REGNUM + (size / 4);
regcache_cooked_write (regcache, regnum, buf);
if (len == 8 && size < 20)
regcache_cooked_write (regcache, regnum + 1, buf + 4);
}
}
/* Reserve space for the struct/union return value pointer. */
sp -= 4;
/* Stack should be doubleword aligned at this point. */
gdb_assert (sp % 8 == 0);
/* Return the adjusted stack pointer. */
return sp;
}
/* The SPARC passes the arguments on the stack; arguments smaller
than an int are promoted to an int. The first 6 words worth of
args are also passed in registers o0 - o5. */
@ -2215,71 +2333,27 @@ CORE_ADDR
sparc32_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
int i, j, oregnum;
int accumulate_size = 0;
struct sparc_arg
{
char *contents;
int len;
int offset;
};
struct sparc_arg *sparc_args =
(struct sparc_arg *) alloca (nargs * sizeof (struct sparc_arg));
struct sparc_arg *m_arg;
sp = sparc32_do_push_arguments (current_regcache, nargs, args, sp);
/* Promote arguments if necessary, and calculate their stack offsets
and sizes. */
for (i = 0, m_arg = sparc_args; i < nargs; i++, m_arg++)
/* FIXME: kettenis/20030525: We don't let this function set the
struct/union return pointer just yet. */
#if 0
if (struct_return)
{
struct value *arg = args[i];
struct type *arg_type = check_typedef (VALUE_TYPE (arg));
/* Cast argument to long if necessary as the compiler does it too. */
switch (TYPE_CODE (arg_type))
{
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
case TYPE_CODE_RANGE:
case TYPE_CODE_ENUM:
if (TYPE_LENGTH (arg_type) < TYPE_LENGTH (builtin_type_long))
{
arg_type = builtin_type_long;
arg = value_cast (arg_type, arg);
}
break;
default:
break;
}
m_arg->len = TYPE_LENGTH (arg_type);
m_arg->offset = accumulate_size;
accumulate_size = (accumulate_size + m_arg->len + 3) & ~3;
m_arg->contents = VALUE_CONTENTS (arg);
}
char buf[4];
/* Make room for the arguments on the stack. */
accumulate_size += DEPRECATED_CALL_DUMMY_STACK_ADJUST;
sp = ((sp - accumulate_size) & ~7) + DEPRECATED_CALL_DUMMY_STACK_ADJUST;
/* `Push' arguments on the stack. */
for (i = 0, oregnum = 0, m_arg = sparc_args;
i < nargs;
i++, m_arg++)
{
write_memory (sp + m_arg->offset, m_arg->contents, m_arg->len);
for (j = 0;
j < m_arg->len && oregnum < 6;
j += SPARC_INTREG_SIZE, oregnum++)
deprecated_write_register_gen (O0_REGNUM + oregnum, m_arg->contents + j);
/* The space for the struct/union return value pointer has
already been reserved. */
store_unsigned_integer (buf, 4, struct_addr);
write (sp, buf, 4);
}
return sp;
#else
return sp + 4;
#endif
}
#define SPARC_F0_REGNUM FP0_REGNUM /* %f0 */
#define SPARC_F1_REGNUM (FP0_REGNUM + 1)/* %f1 */
#define SPARC_O0_REGNUM O0_REGNUM /* %o0 */
#define SPARC_O1_REGNUM O1_REGNUM /* %o1 */
/* Extract from REGCACHE a function return value of type TYPE and copy
that into VALBUF.