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2004-02-25 Andrew Cagney <cagney@redhat.com>

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* hppa-tdep.c (hppa32_push_dummy_call): Rewrite.
This commit is contained in:
Andrew Cagney 2004-02-25 20:00:40 +00:00
parent 7161a3a693
commit 79508e1e22
2 changed files with 119 additions and 99 deletions
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4
gdb/ChangeLog
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@ -1,3 +1,7 @@
2004-02-25 Andrew Cagney <cagney@redhat.com>
* hppa-tdep.c (hppa32_push_dummy_call): Rewrite.
2004-02-25 Mark Kettenis <kettenis@gnu.org>
* config/i386/tm-x86-64linux.h: Tweak comments.

214
gdb/hppa-tdep.c
View File

@ -2171,6 +2171,121 @@ hppa_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
#endif
/* This function pushes a stack frame with arguments as part of the
inferior function calling mechanism.
This is the version of the function for the 32-bit PA machines, in
which later arguments appear at lower addresses. (The stack always
grows towards higher addresses.)
We simply allocate the appropriate amount of stack space and put
arguments into their proper slots. */
CORE_ADDR
hppa32_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
/* NOTE: cagney/2004-02-27: This is a guess - its implemented by
reverse engineering testsuite failures. */
/* Stack base address at which any pass-by-reference parameters are
stored. */
CORE_ADDR struct_end = 0;
/* Stack base address at which the first parameter is stored. */
CORE_ADDR param_end = 0;
/* The inner most end of the stack after all the parameters have
been pushed. */
CORE_ADDR new_sp = 0;
/* Two passes. First pass computes the location of everything,
second pass writes the bytes out. */
int write_pass;
for (write_pass = 0; write_pass < 2; write_pass++)
{
CORE_ADDR struct_ptr = struct_end;
CORE_ADDR param_ptr = param_end;
int reg = 27; /* NOTE: Registers go down. */
int i;
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = check_typedef (VALUE_TYPE (arg));
/* The corresponding parameter that is pushed onto the
stack, and [possibly] passed in a register. */
char param_val[8];
int param_len;
memset (param_val, 0, sizeof param_val);
if (TYPE_LENGTH (type) > 8)
{
/* Large parameter, pass by reference. Store the value
in "struct" area and then pass its address. */
param_len = 4;
struct_ptr -= align_up (TYPE_LENGTH (type), 8);
if (write_pass)
write_memory (struct_ptr, VALUE_CONTENTS (arg),
TYPE_LENGTH (type));
store_unsigned_integer (param_val, 4, struct_ptr);
}
else if (TYPE_CODE (type) == TYPE_CODE_INT
|| TYPE_CODE (type) == TYPE_CODE_ENUM)
{
/* Integer value store, right aligned. "unpack_long"
takes care of any sign-extension problems. */
param_len = align_up (TYPE_LENGTH (type), 4);
store_unsigned_integer (param_val, param_len,
unpack_long (type,
VALUE_CONTENTS (arg)));
}
else
{
/* Small struct value, store right aligned? */
param_len = align_up (TYPE_LENGTH (type), 4);
memcpy (param_val + param_len - TYPE_LENGTH (type),
VALUE_CONTENTS (arg), TYPE_LENGTH (type));
}
param_ptr -= param_len;
reg -= param_len / 4;
if (write_pass)
{
write_memory (param_ptr, param_val, param_len);
if (reg >= 23)
{
regcache_cooked_write (regcache, reg, param_val);
if (param_len > 4)
regcache_cooked_write (regcache, reg + 1, param_val + 4);
}
}
}
/* Update the various stack pointers. */
if (!write_pass)
{
struct_end = sp + struct_ptr;
/* PARAM_PTR already accounts for all the arguments passed
by the user. However, the ABI mandates minimum stack
space allocations for outgoing arguments. The ABI also
mandates minimum stack alignments which we must
preserve. */
param_end = struct_end + max (align_up (param_ptr, 8),
REG_PARM_STACK_SPACE);
}
}
/* If a structure has to be returned, set up register 28 to hold its
address */
if (struct_return)
write_register (28, struct_addr);
/* Set the return address. */
regcache_cooked_write_unsigned (regcache, RP_REGNUM, bp_addr);
/* The stack will have 32 bytes of additional space for a frame marker. */
return param_end + 32;
}
/* This function pushes a stack frame with arguments as part of the
inferior function calling mechanism.
@ -2297,105 +2412,6 @@ hppa64_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
}
/* This function pushes a stack frame with arguments as part of the
inferior function calling mechanism.
This is the version of the function for the 32-bit PA machines, in
which later arguments appear at lower addresses. (The stack always
grows towards higher addresses.)
We simply allocate the appropriate amount of stack space and put
arguments into their proper slots. */
CORE_ADDR
hppa32_push_dummy_call (struct gdbarch *gdbarch, CORE_ADDR func_addr,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
struct tdep *tdep = gdbarch_tdep (gdbarch);
/* array of arguments' offsets */
int *offset = (int *) alloca (nargs * sizeof (int));
/* array of arguments' lengths: real lengths in bytes, not aligned to
word size */
int *lengths = (int *) alloca (nargs * sizeof (int));
/* The number of stack bytes occupied by the current argument. */
int bytes_reserved;
/* The total number of bytes reserved for the arguments. */
int cum_bytes_reserved = 0;
/* Similarly, but aligned. */
int cum_bytes_aligned = 0;
int i;
/* Iterate over each argument provided by the user. */
for (i = 0; i < nargs; i++)
{
lengths[i] = TYPE_LENGTH (VALUE_TYPE (args[i]));
/* Align the size of the argument to the word size for this
target. */
bytes_reserved = (lengths[i] + 4 - 1) & -4;
offset[i] = (cum_bytes_reserved + (lengths[i] > 4
? bytes_reserved : lengths[i]));
/* If the argument is a double word argument, then it needs to be
double word aligned. */
if ((bytes_reserved == 2 * 4)
&& (offset[i] % 2 * 4))
{
int new_offset = 0;
/* BYTES_RESERVED is already aligned to the word, so we put
the argument at one word more down the stack.
This will leave one empty word on the stack, and one
unused register as mandated by the ABI. */
new_offset = ((offset[i] + 2 * 4 - 1)
& -(2 * 4));
if ((new_offset - offset[i]) >= 2 * 4)
{
bytes_reserved += 4;
offset[i] += 4;
}
}
cum_bytes_reserved += bytes_reserved;
}
/* CUM_BYTES_RESERVED already accounts for all the arguments passed
by the user. However, the ABI mandates minimum stack space
allocations for outgoing arguments.
The ABI also mandates minimum stack alignments which we must
preserve. */
cum_bytes_aligned = align_up (cum_bytes_reserved, 8);
sp += max (cum_bytes_aligned, REG_PARM_STACK_SPACE);
/* Now write each of the args at the proper offset down the stack.
?!? We need to promote values to a full register instead of skipping
words in the stack. */
for (i = 0; i < nargs; i++)
write_memory (sp - offset[i], VALUE_CONTENTS (args[i]), lengths[i]);
/* If a structure has to be returned, set up register 28 to hold its
address */
if (struct_return)
write_register (28, struct_addr);
/* Set the return address. */
regcache_cooked_write_unsigned (regcache, RP_REGNUM, bp_addr);
/* The stack will have 32 bytes of additional space for a frame marker. */
return sp + 32;
}
/* Force all frames to 16-byte alignment. Better safe than sorry. */
static CORE_ADDR