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hppa-tdep.c
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/* Target-dependent code for the HP PA-RISC architecture.
Copyright (C) 1986-2015 Free Software Foundation, Inc.
Contributed by the Center for Software Science at the
University of Utah ([email protected]).
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "bfd.h"
#include "inferior.h"
#include "regcache.h"
#include "completer.h"
#include "osabi.h"
#include "arch-utils.h"
/* For argument passing to the inferior. */
#include "symtab.h"
#include "dis-asm.h"
#include "trad-frame.h"
#include "frame-unwind.h"
#include "frame-base.h"
#include "gdbcore.h"
#include "gdbcmd.h"
#include "gdbtypes.h"
#include "objfiles.h"
#include "hppa-tdep.h"
static int hppa_debug = 0;
/* Some local constants. */
static const int hppa32_num_regs = 128;
static const int hppa64_num_regs = 96;
/* We use the objfile->obj_private pointer for two things:
* 1. An unwind table;
*
* 2. A pointer to any associated shared library object.
*
* #defines are used to help refer to these objects.
*/
/* Info about the unwind table associated with an object file.
* This is hung off of the "objfile->obj_private" pointer, and
* is allocated in the objfile's psymbol obstack. This allows
* us to have unique unwind info for each executable and shared
* library that we are debugging.
*/
struct hppa_unwind_info
{
struct unwind_table_entry *table; /* Pointer to unwind info */
struct unwind_table_entry *cache; /* Pointer to last entry we found */
int last; /* Index of last entry */
};
struct hppa_objfile_private
{
struct hppa_unwind_info *unwind_info; /* a pointer */
struct so_list *so_info; /* a pointer */
CORE_ADDR dp;
int dummy_call_sequence_reg;
CORE_ADDR dummy_call_sequence_addr;
};
/* hppa-specific object data -- unwind and solib info.
TODO/maybe: think about splitting this into two parts; the unwind data is
common to all hppa targets, but is only used in this file; we can register
that separately and make this static. The solib data is probably hpux-
specific, so we can create a separate extern objfile_data that is registered
by hppa-hpux-tdep.c and shared with pa64solib.c and somsolib.c. */
static const struct objfile_data *hppa_objfile_priv_data = NULL;
/* Get at various relevent fields of an instruction word. */
#define MASK_5 0x1f
#define MASK_11 0x7ff
#define MASK_14 0x3fff
#define MASK_21 0x1fffff
/* Sizes (in bytes) of the native unwind entries. */
#define UNWIND_ENTRY_SIZE 16
#define STUB_UNWIND_ENTRY_SIZE 8
/* Routines to extract various sized constants out of hppa
instructions. */
/* This assumes that no garbage lies outside of the lower bits of
value. */
static int
hppa_sign_extend (unsigned val, unsigned bits)
{
return (int) (val >> (bits - 1) ? (-1 << bits) | val : val);
}
/* For many immediate values the sign bit is the low bit! */
static int
hppa_low_hppa_sign_extend (unsigned val, unsigned bits)
{
return (int) ((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
}
/* Extract the bits at positions between FROM and TO, using HP's numbering
(MSB = 0). */
int
hppa_get_field (unsigned word, int from, int to)
{
return ((word) >> (31 - (to)) & ((1 << ((to) - (from) + 1)) - 1));
}
/* Extract the immediate field from a ld{bhw}s instruction. */
int
hppa_extract_5_load (unsigned word)
{
return hppa_low_hppa_sign_extend (word >> 16 & MASK_5, 5);
}
/* Extract the immediate field from a break instruction. */
unsigned
hppa_extract_5r_store (unsigned word)
{
return (word & MASK_5);
}
/* Extract the immediate field from a {sr}sm instruction. */
unsigned
hppa_extract_5R_store (unsigned word)
{
return (word >> 16 & MASK_5);
}
/* Extract a 14 bit immediate field. */
int
hppa_extract_14 (unsigned word)
{
return hppa_low_hppa_sign_extend (word & MASK_14, 14);
}
/* Extract a 21 bit constant. */
int
hppa_extract_21 (unsigned word)
{
int val;
word &= MASK_21;
word <<= 11;
val = hppa_get_field (word, 20, 20);
val <<= 11;
val |= hppa_get_field (word, 9, 19);
val <<= 2;
val |= hppa_get_field (word, 5, 6);
val <<= 5;
val |= hppa_get_field (word, 0, 4);
val <<= 2;
val |= hppa_get_field (word, 7, 8);
return hppa_sign_extend (val, 21) << 11;
}
/* extract a 17 bit constant from branch instructions, returning the
19 bit signed value. */
int
hppa_extract_17 (unsigned word)
{
return hppa_sign_extend (hppa_get_field (word, 19, 28) |
hppa_get_field (word, 29, 29) << 10 |
hppa_get_field (word, 11, 15) << 11 |
(word & 0x1) << 16, 17) << 2;
}
CORE_ADDR
hppa_symbol_address(const char *sym)
{
struct bound_minimal_symbol minsym;
minsym = lookup_minimal_symbol (sym, NULL, NULL);
if (minsym.minsym)
return BMSYMBOL_VALUE_ADDRESS (minsym);
else
return (CORE_ADDR)-1;
}
static struct hppa_objfile_private *
hppa_init_objfile_priv_data (struct objfile *objfile)
{
struct hppa_objfile_private *priv;
priv = (struct hppa_objfile_private *)
obstack_alloc (&objfile->objfile_obstack,
sizeof (struct hppa_objfile_private));
set_objfile_data (objfile, hppa_objfile_priv_data, priv);
memset (priv, 0, sizeof (*priv));
return priv;
}
/* Compare the start address for two unwind entries returning 1 if
the first address is larger than the second, -1 if the second is
larger than the first, and zero if they are equal. */
static int
compare_unwind_entries (const void *arg1, const void *arg2)
{
const struct unwind_table_entry *a = arg1;
const struct unwind_table_entry *b = arg2;
if (a->region_start > b->region_start)
return 1;
else if (a->region_start < b->region_start)
return -1;
else
return 0;
}
static void
record_text_segment_lowaddr (bfd *abfd, asection *section, void *data)
{
if ((section->flags & (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
== (SEC_ALLOC | SEC_LOAD | SEC_READONLY))
{
bfd_vma value = section->vma - section->filepos;
CORE_ADDR *low_text_segment_address = (CORE_ADDR *)data;
if (value < *low_text_segment_address)
*low_text_segment_address = value;
}
}
static void
internalize_unwinds (struct objfile *objfile, struct unwind_table_entry *table,
asection *section, unsigned int entries,
size_t size, CORE_ADDR text_offset)
{
/* We will read the unwind entries into temporary memory, then
fill in the actual unwind table. */
if (size > 0)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
unsigned long tmp;
unsigned i;
char *buf = alloca (size);
CORE_ADDR low_text_segment_address;
/* For ELF targets, then unwinds are supposed to
be segment relative offsets instead of absolute addresses.
Note that when loading a shared library (text_offset != 0) the
unwinds are already relative to the text_offset that will be
passed in. */
if (gdbarch_tdep (gdbarch)->is_elf && text_offset == 0)
{
low_text_segment_address = -1;
bfd_map_over_sections (objfile->obfd,
record_text_segment_lowaddr,
&low_text_segment_address);
text_offset = low_text_segment_address;
}
else if (gdbarch_tdep (gdbarch)->solib_get_text_base)
{
text_offset = gdbarch_tdep (gdbarch)->solib_get_text_base (objfile);
}
bfd_get_section_contents (objfile->obfd, section, buf, 0, size);
/* Now internalize the information being careful to handle host/target
endian issues. */
for (i = 0; i < entries; i++)
{
table[i].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *) buf);
table[i].region_start += text_offset;
buf += 4;
table[i].region_end = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
table[i].region_end += text_offset;
buf += 4;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
buf += 4;
table[i].Cannot_unwind = (tmp >> 31) & 0x1;
table[i].Millicode = (tmp >> 30) & 0x1;
table[i].Millicode_save_sr0 = (tmp >> 29) & 0x1;
table[i].Region_description = (tmp >> 27) & 0x3;
table[i].reserved = (tmp >> 26) & 0x1;
table[i].Entry_SR = (tmp >> 25) & 0x1;
table[i].Entry_FR = (tmp >> 21) & 0xf;
table[i].Entry_GR = (tmp >> 16) & 0x1f;
table[i].Args_stored = (tmp >> 15) & 0x1;
table[i].Variable_Frame = (tmp >> 14) & 0x1;
table[i].Separate_Package_Body = (tmp >> 13) & 0x1;
table[i].Frame_Extension_Millicode = (tmp >> 12) & 0x1;
table[i].Stack_Overflow_Check = (tmp >> 11) & 0x1;
table[i].Two_Instruction_SP_Increment = (tmp >> 10) & 0x1;
table[i].sr4export = (tmp >> 9) & 0x1;
table[i].cxx_info = (tmp >> 8) & 0x1;
table[i].cxx_try_catch = (tmp >> 7) & 0x1;
table[i].sched_entry_seq = (tmp >> 6) & 0x1;
table[i].reserved1 = (tmp >> 5) & 0x1;
table[i].Save_SP = (tmp >> 4) & 0x1;
table[i].Save_RP = (tmp >> 3) & 0x1;
table[i].Save_MRP_in_frame = (tmp >> 2) & 0x1;
table[i].save_r19 = (tmp >> 1) & 0x1;
table[i].Cleanup_defined = tmp & 0x1;
tmp = bfd_get_32 (objfile->obfd, (bfd_byte *) buf);
buf += 4;
table[i].MPE_XL_interrupt_marker = (tmp >> 31) & 0x1;
table[i].HP_UX_interrupt_marker = (tmp >> 30) & 0x1;
table[i].Large_frame = (tmp >> 29) & 0x1;
table[i].alloca_frame = (tmp >> 28) & 0x1;
table[i].reserved2 = (tmp >> 27) & 0x1;
table[i].Total_frame_size = tmp & 0x7ffffff;
/* Stub unwinds are handled elsewhere. */
table[i].stub_unwind.stub_type = 0;
table[i].stub_unwind.padding = 0;
}
}
}
/* Read in the backtrace information stored in the `$UNWIND_START$' section of
the object file. This info is used mainly by find_unwind_entry() to find
out the stack frame size and frame pointer used by procedures. We put
everything on the psymbol obstack in the objfile so that it automatically
gets freed when the objfile is destroyed. */
static void
read_unwind_info (struct objfile *objfile)
{
asection *unwind_sec, *stub_unwind_sec;
size_t unwind_size, stub_unwind_size, total_size;
unsigned index, unwind_entries;
unsigned stub_entries, total_entries;
CORE_ADDR text_offset;
struct hppa_unwind_info *ui;
struct hppa_objfile_private *obj_private;
text_offset = ANOFFSET (objfile->section_offsets, SECT_OFF_TEXT (objfile));
ui = (struct hppa_unwind_info *) obstack_alloc (&objfile->objfile_obstack,
sizeof (struct hppa_unwind_info));
ui->table = NULL;
ui->cache = NULL;
ui->last = -1;
/* For reasons unknown the HP PA64 tools generate multiple unwinder
sections in a single executable. So we just iterate over every
section in the BFD looking for unwinder sections intead of trying
to do a lookup with bfd_get_section_by_name.
First determine the total size of the unwind tables so that we
can allocate memory in a nice big hunk. */
total_entries = 0;
for (unwind_sec = objfile->obfd->sections;
unwind_sec;
unwind_sec = unwind_sec->next)
{
if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
|| strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
{
unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
total_entries += unwind_entries;
}
}
/* Now compute the size of the stub unwinds. Note the ELF tools do not
use stub unwinds at the current time. */
stub_unwind_sec = bfd_get_section_by_name (objfile->obfd, "$UNWIND_END$");
if (stub_unwind_sec)
{
stub_unwind_size = bfd_section_size (objfile->obfd, stub_unwind_sec);
stub_entries = stub_unwind_size / STUB_UNWIND_ENTRY_SIZE;
}
else
{
stub_unwind_size = 0;
stub_entries = 0;
}
/* Compute total number of unwind entries and their total size. */
total_entries += stub_entries;
total_size = total_entries * sizeof (struct unwind_table_entry);
/* Allocate memory for the unwind table. */
ui->table = (struct unwind_table_entry *)
obstack_alloc (&objfile->objfile_obstack, total_size);
ui->last = total_entries - 1;
/* Now read in each unwind section and internalize the standard unwind
entries. */
index = 0;
for (unwind_sec = objfile->obfd->sections;
unwind_sec;
unwind_sec = unwind_sec->next)
{
if (strcmp (unwind_sec->name, "$UNWIND_START$") == 0
|| strcmp (unwind_sec->name, ".PARISC.unwind") == 0)
{
unwind_size = bfd_section_size (objfile->obfd, unwind_sec);
unwind_entries = unwind_size / UNWIND_ENTRY_SIZE;
internalize_unwinds (objfile, &ui->table[index], unwind_sec,
unwind_entries, unwind_size, text_offset);
index += unwind_entries;
}
}
/* Now read in and internalize the stub unwind entries. */
if (stub_unwind_size > 0)
{
unsigned int i;
char *buf = alloca (stub_unwind_size);
/* Read in the stub unwind entries. */
bfd_get_section_contents (objfile->obfd, stub_unwind_sec, buf,
0, stub_unwind_size);
/* Now convert them into regular unwind entries. */
for (i = 0; i < stub_entries; i++, index++)
{
/* Clear out the next unwind entry. */
memset (&ui->table[index], 0, sizeof (struct unwind_table_entry));
/* Convert offset & size into region_start and region_end.
Stuff away the stub type into "reserved" fields. */
ui->table[index].region_start = bfd_get_32 (objfile->obfd,
(bfd_byte *) buf);
ui->table[index].region_start += text_offset;
buf += 4;
ui->table[index].stub_unwind.stub_type = bfd_get_8 (objfile->obfd,
(bfd_byte *) buf);
buf += 2;
ui->table[index].region_end
= ui->table[index].region_start + 4 *
(bfd_get_16 (objfile->obfd, (bfd_byte *) buf) - 1);
buf += 2;
}
}
/* Unwind table needs to be kept sorted. */
qsort (ui->table, total_entries, sizeof (struct unwind_table_entry),
compare_unwind_entries);
/* Keep a pointer to the unwind information. */
obj_private = (struct hppa_objfile_private *)
objfile_data (objfile, hppa_objfile_priv_data);
if (obj_private == NULL)
obj_private = hppa_init_objfile_priv_data (objfile);
obj_private->unwind_info = ui;
}
/* Lookup the unwind (stack backtrace) info for the given PC. We search all
of the objfiles seeking the unwind table entry for this PC. Each objfile
contains a sorted list of struct unwind_table_entry. Since we do a binary
search of the unwind tables, we depend upon them to be sorted. */
struct unwind_table_entry *
find_unwind_entry (CORE_ADDR pc)
{
int first, middle, last;
struct objfile *objfile;
struct hppa_objfile_private *priv;
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "{ find_unwind_entry %s -> ",
hex_string (pc));
/* A function at address 0? Not in HP-UX! */
if (pc == (CORE_ADDR) 0)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "NULL }\n");
return NULL;
}
ALL_OBJFILES (objfile)
{
struct hppa_unwind_info *ui;
ui = NULL;
priv = objfile_data (objfile, hppa_objfile_priv_data);
if (priv)
ui = ((struct hppa_objfile_private *) priv)->unwind_info;
if (!ui)
{
read_unwind_info (objfile);
priv = objfile_data (objfile, hppa_objfile_priv_data);
if (priv == NULL)
error (_("Internal error reading unwind information."));
ui = ((struct hppa_objfile_private *) priv)->unwind_info;
}
/* First, check the cache. */
if (ui->cache
&& pc >= ui->cache->region_start
&& pc <= ui->cache->region_end)
{
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "%s (cached) }\n",
hex_string ((uintptr_t) ui->cache));
return ui->cache;
}
/* Not in the cache, do a binary search. */
first = 0;
last = ui->last;
while (first <= last)
{
middle = (first + last) / 2;
if (pc >= ui->table[middle].region_start
&& pc <= ui->table[middle].region_end)
{
ui->cache = &ui->table[middle];
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "%s }\n",
hex_string ((uintptr_t) ui->cache));
return &ui->table[middle];
}
if (pc < ui->table[middle].region_start)
last = middle - 1;
else
first = middle + 1;
}
} /* ALL_OBJFILES() */
if (hppa_debug)
fprintf_unfiltered (gdb_stdlog, "NULL (not found) }\n");
return NULL;
}
/* Implement the stack_frame_destroyed_p gdbarch method.
The epilogue is defined here as the area either on the `bv' instruction
itself or an instruction which destroys the function's stack frame.
We do not assume that the epilogue is at the end of a function as we can
also have return sequences in the middle of a function. */
static int
hppa_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
unsigned long status;
unsigned int inst;
gdb_byte buf[4];
status = target_read_memory (pc, buf, 4);
if (status != 0)
return 0;
inst = extract_unsigned_integer (buf, 4, byte_order);
/* The most common way to perform a stack adjustment ldo X(sp),sp
We are destroying a stack frame if the offset is negative. */
if ((inst & 0xffffc000) == 0x37de0000
&& hppa_extract_14 (inst) < 0)
return 1;
/* ldw,mb D(sp),X or ldd,mb D(sp),X */
if (((inst & 0x0fc010e0) == 0x0fc010e0
|| (inst & 0x0fc010e0) == 0x0fc010e0)
&& hppa_extract_14 (inst) < 0)
return 1;
/* bv %r0(%rp) or bv,n %r0(%rp) */
if (inst == 0xe840c000 || inst == 0xe840c002)
return 1;
return 0;
}
static const unsigned char *
hppa_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pc, int *len)
{
static const unsigned char breakpoint[] = {0x00, 0x01, 0x00, 0x04};
(*len) = sizeof (breakpoint);
return breakpoint;
}
/* Return the name of a register. */
static const char *
hppa32_register_name (struct gdbarch *gdbarch, int i)
{
static char *names[] = {
"flags", "r1", "rp", "r3",
"r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23",
"r24", "r25", "r26", "dp",
"ret0", "ret1", "sp", "r31",
"sar", "pcoqh", "pcsqh", "pcoqt",
"pcsqt", "eiem", "iir", "isr",
"ior", "ipsw", "goto", "sr4",
"sr0", "sr1", "sr2", "sr3",
"sr5", "sr6", "sr7", "cr0",
"cr8", "cr9", "ccr", "cr12",
"cr13", "cr24", "cr25", "cr26",
"mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
"fpsr", "fpe1", "fpe2", "fpe3",
"fpe4", "fpe5", "fpe6", "fpe7",
"fr4", "fr4R", "fr5", "fr5R",
"fr6", "fr6R", "fr7", "fr7R",
"fr8", "fr8R", "fr9", "fr9R",
"fr10", "fr10R", "fr11", "fr11R",
"fr12", "fr12R", "fr13", "fr13R",
"fr14", "fr14R", "fr15", "fr15R",
"fr16", "fr16R", "fr17", "fr17R",
"fr18", "fr18R", "fr19", "fr19R",
"fr20", "fr20R", "fr21", "fr21R",
"fr22", "fr22R", "fr23", "fr23R",
"fr24", "fr24R", "fr25", "fr25R",
"fr26", "fr26R", "fr27", "fr27R",
"fr28", "fr28R", "fr29", "fr29R",
"fr30", "fr30R", "fr31", "fr31R"
};
if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
return NULL;
else
return names[i];
}
static const char *
hppa64_register_name (struct gdbarch *gdbarch, int i)
{
static char *names[] = {
"flags", "r1", "rp", "r3",
"r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11",
"r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19",
"r20", "r21", "r22", "r23",
"r24", "r25", "r26", "dp",
"ret0", "ret1", "sp", "r31",
"sar", "pcoqh", "pcsqh", "pcoqt",
"pcsqt", "eiem", "iir", "isr",
"ior", "ipsw", "goto", "sr4",
"sr0", "sr1", "sr2", "sr3",
"sr5", "sr6", "sr7", "cr0",
"cr8", "cr9", "ccr", "cr12",
"cr13", "cr24", "cr25", "cr26",
"mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",
"fpsr", "fpe1", "fpe2", "fpe3",
"fr4", "fr5", "fr6", "fr7",
"fr8", "fr9", "fr10", "fr11",
"fr12", "fr13", "fr14", "fr15",
"fr16", "fr17", "fr18", "fr19",
"fr20", "fr21", "fr22", "fr23",
"fr24", "fr25", "fr26", "fr27",
"fr28", "fr29", "fr30", "fr31"
};
if (i < 0 || i >= (sizeof (names) / sizeof (*names)))
return NULL;
else
return names[i];
}
/* Map dwarf DBX register numbers to GDB register numbers. */
static int
hppa64_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
{
/* The general registers and the sar are the same in both sets. */
if (reg <= 32)
return reg;
/* fr4-fr31 are mapped from 72 in steps of 2. */
if (reg >= 72 && reg < 72 + 28 * 2 && !(reg & 1))
return HPPA64_FP4_REGNUM + (reg - 72) / 2;
warning (_("Unmapped DWARF DBX Register #%d encountered."), reg);
return -1;
}
/* 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. */
static CORE_ADDR
hppa32_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
/* 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;
/* Global pointer (r19) of the function we are trying to call. */
CORE_ADDR gp;
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
for (write_pass = 0; write_pass < 2; write_pass++)
{
CORE_ADDR struct_ptr = 0;
/* The first parameter goes into sp-36, each stack slot is 4-bytes.
struct_ptr is adjusted for each argument below, so the first
argument will end up at sp-36. */
CORE_ADDR param_ptr = 32;
int i;
int small_struct = 0;
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. */
gdb_byte 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_end - struct_ptr, value_contents (arg),
TYPE_LENGTH (type));
store_unsigned_integer (param_val, 4, byte_order,
struct_end - 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, byte_order,
unpack_long (type,
value_contents (arg)));
}
else if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
/* Floating point value store, right aligned. */
param_len = align_up (TYPE_LENGTH (type), 4);
memcpy (param_val, value_contents (arg), param_len);
}
else
{
param_len = align_up (TYPE_LENGTH (type), 4);
/* Small struct value are stored right-aligned. */
memcpy (param_val + param_len - TYPE_LENGTH (type),
value_contents (arg), TYPE_LENGTH (type));
/* Structures of size 5, 6 and 7 bytes are special in that
the higher-ordered word is stored in the lower-ordered
argument, and even though it is a 8-byte quantity the
registers need not be 8-byte aligned. */
if (param_len > 4 && param_len < 8)
small_struct = 1;
}
param_ptr += param_len;
if (param_len == 8 && !small_struct)
param_ptr = align_up (param_ptr, 8);
/* First 4 non-FP arguments are passed in gr26-gr23.
First 4 32-bit FP arguments are passed in fr4L-fr7L.
First 2 64-bit FP arguments are passed in fr5 and fr7.
The rest go on the stack, starting at sp-36, towards lower
addresses. 8-byte arguments must be aligned to a 8-byte
stack boundary. */
if (write_pass)
{
write_memory (param_end - param_ptr, param_val, param_len);
/* There are some cases when we don't know the type
expected by the callee (e.g. for variadic functions), so
pass the parameters in both general and fp regs. */
if (param_ptr <= 48)
{
int grreg = 26 - (param_ptr - 36) / 4;
int fpLreg = 72 + (param_ptr - 36) / 4 * 2;
int fpreg = 74 + (param_ptr - 32) / 8 * 4;
regcache_cooked_write (regcache, grreg, param_val);
regcache_cooked_write (regcache, fpLreg, param_val);
if (param_len > 4)
{
regcache_cooked_write (regcache, grreg + 1,
param_val + 4);
regcache_cooked_write (regcache, fpreg, param_val);
regcache_cooked_write (regcache, fpreg + 1,
param_val + 4);
}
}
}
}
/* Update the various stack pointers. */
if (!write_pass)
{
struct_end = sp + align_up (struct_ptr, 64);
/* 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 + align_up (param_ptr, 64);
}
}
/* If a structure has to be returned, set up register 28 to hold its
address. */
if (struct_return)
regcache_cooked_write_unsigned (regcache, 28, struct_addr);
gp = tdep->find_global_pointer (gdbarch, function);
if (gp != 0)
regcache_cooked_write_unsigned (regcache, 19, gp);
/* Set the return address. */
if (!gdbarch_push_dummy_code_p (gdbarch))
regcache_cooked_write_unsigned (regcache, HPPA_RP_REGNUM, bp_addr);
/* Update the Stack Pointer. */
regcache_cooked_write_unsigned (regcache, HPPA_SP_REGNUM, param_end);
return param_end;
}
/* The 64-bit PA-RISC calling conventions are documented in "64-Bit
Runtime Architecture for PA-RISC 2.0", which is distributed as part
as of the HP-UX Software Transition Kit (STK). This implementation
is based on version 3.3, dated October 6, 1997. */
/* Check whether TYPE is an "Integral or Pointer Scalar Type". */
static int
hppa64_integral_or_pointer_p (const struct type *type)
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
case TYPE_CODE_ENUM:
case TYPE_CODE_RANGE:
{
int len = TYPE_LENGTH (type);
return (len == 1 || len == 2 || len == 4 || len == 8);
}
case TYPE_CODE_PTR:
case TYPE_CODE_REF:
return (TYPE_LENGTH (type) == 8);
default:
break;
}
return 0;
}
/* Check whether TYPE is a "Floating Scalar Type". */
static int
hppa64_floating_p (const struct type *type)
{
switch (TYPE_CODE (type))
{
case TYPE_CODE_FLT:
{
int len = TYPE_LENGTH (type);
return (len == 4 || len == 8 || len == 16);
}
default:
break;
}
return 0;
}
/* If CODE points to a function entry address, try to look up the corresponding
function descriptor and return its address instead. If CODE is not a
function entry address, then just return it unchanged. */
static CORE_ADDR
hppa64_convert_code_addr_to_fptr (struct gdbarch *gdbarch, CORE_ADDR code)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
struct obj_section *sec, *opd;
sec = find_pc_section (code);
if (!sec)
return code;
/* If CODE is in a data section, assume it's already a fptr. */
if (!(sec->the_bfd_section->flags & SEC_CODE))
return code;
ALL_OBJFILE_OSECTIONS (sec->objfile, opd)
{
if (strcmp (opd->the_bfd_section->name, ".opd") == 0)
break;
}
if (opd < sec->objfile->sections_end)
{
CORE_ADDR addr;
for (addr = obj_section_addr (opd);
addr < obj_section_endaddr (opd);
addr += 2 * 8)
{
ULONGEST opdaddr;
gdb_byte tmp[8];
if (target_read_memory (addr, tmp, sizeof (tmp)))
break;
opdaddr = extract_unsigned_integer (tmp, sizeof (tmp), byte_order);
if (opdaddr == code)
return addr - 16;
}
}
return code;
}
static CORE_ADDR
hppa64_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
struct regcache *regcache, CORE_ADDR bp_addr,
int nargs, struct value **args, CORE_ADDR sp,
int struct_return, CORE_ADDR struct_addr)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int i, offset = 0;
CORE_ADDR gp;
/* "The outgoing parameter area [...] must be aligned at a 16-byte
boundary." */
sp = align_up (sp, 16);
for (i = 0; i < nargs; i++)
{
struct value *arg = args[i];
struct type *type = value_type (arg);
int len = TYPE_LENGTH (type);
const bfd_byte *valbuf;
bfd_byte fptrbuf[8];
int regnum;