a9df6b2252
gdb/ChangeLog:
* ia64-hpux-nat.c (ia64_hpux_fetch_register): Remove trailing
new-line at end of warning message.
(ia64_hpux_store_register): Remove trailing new-line at end of
error message.
* ia64-hpux-tdep.c: Rephrase comment.
* solib-ia64-hpux.c (struct dld_info): Change type of field
dld_flags from "long long" to ULONGEST.
435 lines
14 KiB
C
435 lines
14 KiB
C
/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
|
|
|
|
Copyright (C) 2010 Free Software Foundation, Inc.
|
|
|
|
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 "ia64-tdep.h"
|
|
#include "ia64-hpux-tdep.h"
|
|
#include "osabi.h"
|
|
#include "gdbtypes.h"
|
|
#include "solib.h"
|
|
#include "target.h"
|
|
#include "frame.h"
|
|
#include "regcache.h"
|
|
#include "gdbcore.h"
|
|
#include "inferior.h"
|
|
|
|
/* A sequence of instructions pushed on the stack when we want to perform
|
|
an inferior function call. The main purpose of this code is to save
|
|
the output region of the register frame belonging to the function
|
|
from which we are making the call. Normally, all registers are saved
|
|
prior to the call, but this does not include stacked registers because
|
|
they are seen by GDB as pseudo registers.
|
|
|
|
With Linux kernels, these stacked registers can be saved by simply
|
|
creating a new register frame, or in other words by moving the BSP.
|
|
But the HP/UX kernel does not allow this. So we rely on this code
|
|
instead, that makes functions calls whose only purpose is to create
|
|
new register frames.
|
|
|
|
The array below is the result obtained after assembling the code
|
|
shown below. It's an array of bytes in order to make it independent
|
|
of the host endianess, in case it ends up being used on more than
|
|
one target.
|
|
|
|
start:
|
|
// Save b0 before using it (into preserved reg: r4).
|
|
mov r4 = b0
|
|
;;
|
|
|
|
br.call.dptk.few b0 = stub#
|
|
;;
|
|
|
|
// Add a nop bundle where we can insert our dummy breakpoint.
|
|
nop.m 0
|
|
nop.i 0
|
|
nop.i 0
|
|
;;
|
|
|
|
stub:
|
|
// Alloc a new register stack frame. Here, we set the size
|
|
// of all regions to zero. Eventually, GDB will manually
|
|
// change the instruction to set the size of the local region
|
|
// to match size of the output region of the function from
|
|
// which we are making the function call. This is to protect
|
|
// the value of the output registers of the function from
|
|
// which we are making the call.
|
|
alloc r6 = ar.pfs, 0, 0, 0, 0
|
|
|
|
// Save b0 before using it again (into preserved reg: r5).
|
|
mov r5 = b0
|
|
;;
|
|
|
|
// Now that we have protected the entire output region of the
|
|
// register stack frame, we can call our function that will
|
|
// setup the arguments, and call our target function.
|
|
br.call.dptk.few b0 = call_dummy#
|
|
;;
|
|
|
|
// Restore b0, ar.pfs, and return
|
|
mov b0 = r5
|
|
mov.i ar.pfs = r6
|
|
;;
|
|
br.ret.dptk.few b0
|
|
;;
|
|
|
|
call_dummy:
|
|
// Alloc a new frame, with 2 local registers, and 8 output registers
|
|
// (8 output registers for the maximum of 8 slots passed by register).
|
|
alloc r32 = ar.pfs, 2, 0, 8, 0
|
|
|
|
// Save b0 before using it to call our target function.
|
|
mov r33 = b0
|
|
|
|
// Load the argument values placed by GDB inside r14-r21 in their
|
|
// proper registers.
|
|
or r34 = r14, r0
|
|
or r35 = r15, r0
|
|
or r36 = r16, r0
|
|
or r37 = r17, r0
|
|
or r38 = r18, r0
|
|
or r39 = r19, r0
|
|
or r40 = r20, r0
|
|
or r41 = r21, r0
|
|
;;
|
|
|
|
// actual call
|
|
br.call.dptk.few b0 = b1
|
|
;;
|
|
|
|
mov.i ar.pfs=r32
|
|
mov b0=r33
|
|
;;
|
|
|
|
br.ret.dptk.few b0
|
|
;;
|
|
|
|
*/
|
|
|
|
static const gdb_byte ia64_hpux_dummy_code[] =
|
|
{
|
|
0x02, 0x00, 0x00, 0x00, 0x01, 0x00, 0x40, 0x00,
|
|
0x00, 0x62, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
|
|
0x1d, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x00, 0x20, 0x00, 0x00, 0x52,
|
|
0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
|
|
0x02, 0x30, 0x00, 0x00, 0x80, 0x05, 0x50, 0x00,
|
|
0x00, 0x62, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
|
|
0x1d, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x00, 0x30, 0x00, 0x00, 0x52,
|
|
0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x28,
|
|
0x04, 0x80, 0x03, 0x00, 0x60, 0x00, 0xaa, 0x00,
|
|
0x1d, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x80, 0x00, 0x00, 0x84, 0x02,
|
|
0x00, 0x00, 0x29, 0x04, 0x80, 0x05, 0x10, 0x02,
|
|
0x00, 0x62, 0x00, 0x40, 0xe4, 0x00, 0x38, 0x80,
|
|
0x00, 0x18, 0x3d, 0x00, 0x0e, 0x20, 0x40, 0x82,
|
|
0x00, 0x1c, 0x40, 0xa0, 0x14, 0x01, 0x38, 0x80,
|
|
0x00, 0x30, 0x49, 0x00, 0x0e, 0x20, 0x70, 0x9a,
|
|
0x00, 0x1c, 0x40, 0x00, 0x45, 0x01, 0x38, 0x80,
|
|
0x0a, 0x48, 0x55, 0x00, 0x0e, 0x20, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00,
|
|
0x1d, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x00, 0x10, 0x00, 0x80, 0x12,
|
|
0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x01, 0x55, 0x00, 0x00, 0x10, 0x0a, 0x00, 0x07,
|
|
0x1d, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
|
|
0x00, 0x02, 0x00, 0x80, 0x00, 0x00, 0x84, 0x02
|
|
};
|
|
|
|
/* The offset to be used in order to get the __reason pseudo-register
|
|
when using one of the *UREGS ttrace requests (see system header file
|
|
/usr/include/ia64/sys/uregs.h for more details).
|
|
|
|
The documentation for this pseudo-register says that a nonzero value
|
|
indicates that the thread stopped due to a fault, trap, or interrupt.
|
|
A null value indicates a stop inside a syscall. */
|
|
#define IA64_HPUX_UREG_REASON 0x00070000
|
|
|
|
/* Return nonzero if the value of the register identified by REGNUM
|
|
can be modified. */
|
|
|
|
static int
|
|
ia64_hpux_can_store_ar_register (int regnum)
|
|
{
|
|
switch (regnum)
|
|
{
|
|
case IA64_RSC_REGNUM:
|
|
case IA64_RNAT_REGNUM:
|
|
case IA64_CSD_REGNUM:
|
|
case IA64_SSD_REGNUM:
|
|
case IA64_CCV_REGNUM:
|
|
case IA64_UNAT_REGNUM:
|
|
case IA64_FPSR_REGNUM:
|
|
case IA64_PFS_REGNUM:
|
|
case IA64_LC_REGNUM:
|
|
case IA64_EC_REGNUM:
|
|
return 1;
|
|
break;
|
|
|
|
default:
|
|
return 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* The "cannot_store_register" target_ops method. */
|
|
|
|
static int
|
|
ia64_hpux_cannot_store_register (struct gdbarch *gdbarch, int regnum)
|
|
{
|
|
/* General registers. */
|
|
|
|
if (regnum == IA64_GR0_REGNUM)
|
|
return 1;
|
|
|
|
/* FP register. */
|
|
|
|
if (regnum == IA64_FR0_REGNUM || regnum == IA64_FR1_REGNUM)
|
|
return 1;
|
|
|
|
/* Application registers. */
|
|
if (regnum >= IA64_AR0_REGNUM && regnum <= IA64_AR0_REGNUM + 127)
|
|
return (!ia64_hpux_can_store_ar_register (regnum));
|
|
|
|
/* We can store all other registers. */
|
|
return 0;
|
|
}
|
|
|
|
/* Return nonzero if the inferior is stopped inside a system call. */
|
|
|
|
static int
|
|
ia64_hpux_stopped_in_syscall (struct gdbarch *gdbarch)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
struct target_ops *ops = ¤t_target;
|
|
gdb_byte buf[8];
|
|
int len;
|
|
|
|
len = target_read (ops, TARGET_OBJECT_HPUX_UREGS, NULL,
|
|
buf, IA64_HPUX_UREG_REASON, sizeof (buf));
|
|
if (len == -1)
|
|
/* The target wasn't able to tell us. Assume we are not stopped
|
|
in a system call, which is the normal situation. */
|
|
return 0;
|
|
gdb_assert (len == 8);
|
|
|
|
return (extract_unsigned_integer (buf, len, byte_order) == 0);
|
|
}
|
|
|
|
/* The "size_of_register_frame" gdbarch_tdep routine for ia64-hpux. */
|
|
|
|
static int
|
|
ia64_hpux_size_of_register_frame (struct frame_info *this_frame,
|
|
ULONGEST cfm)
|
|
{
|
|
int sof;
|
|
|
|
if (frame_relative_level (this_frame) == 0
|
|
&& ia64_hpux_stopped_in_syscall (get_frame_arch (this_frame)))
|
|
/* If the inferior stopped in a system call, the base address
|
|
of the register frame is at BSP - SOL instead of BSP - SOF.
|
|
This is an HP-UX exception. */
|
|
sof = (cfm & 0x3f80) >> 7;
|
|
else
|
|
sof = (cfm & 0x7f);
|
|
|
|
return sof;
|
|
}
|
|
|
|
/* Implement the push_dummy_code gdbarch method.
|
|
|
|
This function assumes that the SP is already 16-byte-aligned. */
|
|
|
|
static CORE_ADDR
|
|
ia64_hpux_push_dummy_code (struct gdbarch *gdbarch, CORE_ADDR sp,
|
|
CORE_ADDR funaddr, struct value **args, int nargs,
|
|
struct type *value_type, CORE_ADDR *real_pc,
|
|
CORE_ADDR *bp_addr, struct regcache *regcache)
|
|
{
|
|
ULONGEST cfm;
|
|
int sof, sol, sor, soo;
|
|
char buf[16];
|
|
|
|
regcache_cooked_read_unsigned (regcache, IA64_CFM_REGNUM, &cfm);
|
|
sof = cfm & 0x7f;
|
|
sol = (cfm >> 7) & 0x7f;
|
|
sor = (cfm >> 14) & 0xf;
|
|
soo = sof - sol - sor;
|
|
|
|
/* Reserve some space on the stack to hold the dummy code. */
|
|
sp = sp - sizeof (ia64_hpux_dummy_code);
|
|
|
|
/* Set the breakpoint address at the first instruction of the bundle
|
|
in the dummy code that has only nops. This is where the dummy code
|
|
expects us to break. */
|
|
*bp_addr = sp + 0x20;
|
|
|
|
/* Start the inferior function call from the dummy code. The dummy
|
|
code will then call our function. */
|
|
*real_pc = sp;
|
|
|
|
/* Transfer the dummy code to the inferior. */
|
|
write_memory (sp, ia64_hpux_dummy_code, sizeof (ia64_hpux_dummy_code));
|
|
|
|
/* Update the size of the local portion of the register frame allocated
|
|
by ``stub'' to match the size of the output region of the current
|
|
register frame. This allows us to save the stacked registers.
|
|
|
|
The "alloc" instruction is located at slot 0 of the bundle at +0x30.
|
|
Update the "sof" and "sol" portion of that instruction which are
|
|
respectively at bits 18-24 and 25-31 of the bundle. */
|
|
memcpy (buf, ia64_hpux_dummy_code + 0x30, sizeof (buf));
|
|
|
|
buf[2] |= ((soo & 0x3f) << 2);
|
|
buf[3] |= (soo << 1);
|
|
if (soo > 63)
|
|
buf[3] |= 1;
|
|
|
|
write_memory (sp + 0x30, buf, sizeof (buf));
|
|
|
|
/* Return the new (already properly aligned) SP. */
|
|
return sp;
|
|
}
|
|
|
|
/* The "allocate_new_rse_frame" ia64_infcall_ops routine for ia64-hpux. */
|
|
|
|
static void
|
|
ia64_hpux_allocate_new_rse_frame (struct regcache *regcache, ULONGEST bsp,
|
|
int sof)
|
|
{
|
|
/* We cannot change the value of the BSP register on HP-UX,
|
|
so we can't allocate a new RSE frame. */
|
|
}
|
|
|
|
/* The "store_argument_in_slot" ia64_infcall_ops routine for ia64-hpux. */
|
|
|
|
static void
|
|
ia64_hpux_store_argument_in_slot (struct regcache *regcache, CORE_ADDR bsp,
|
|
int slotnum, gdb_byte *buf)
|
|
{
|
|
/* The call sequence on this target expects us to place the arguments
|
|
inside r14 - r21. */
|
|
regcache_cooked_write (regcache, IA64_GR0_REGNUM + 14 + slotnum, buf);
|
|
}
|
|
|
|
/* The "set_function_addr" ia64_infcall_ops routine for ia64-hpux. */
|
|
|
|
static void
|
|
ia64_hpux_set_function_addr (struct regcache *regcache, CORE_ADDR func_addr)
|
|
{
|
|
/* The calling sequence calls the function whose address is placed
|
|
in register b1. */
|
|
regcache_cooked_write_unsigned (regcache, IA64_BR1_REGNUM, func_addr);
|
|
}
|
|
|
|
/* The ia64_infcall_ops structure for ia64-hpux. */
|
|
|
|
static const struct ia64_infcall_ops ia64_hpux_infcall_ops =
|
|
{
|
|
ia64_hpux_allocate_new_rse_frame,
|
|
ia64_hpux_store_argument_in_slot,
|
|
ia64_hpux_set_function_addr
|
|
};
|
|
|
|
/* The "dummy_id" gdbarch routine for ia64-hpux. */
|
|
|
|
static struct frame_id
|
|
ia64_hpux_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
|
|
{
|
|
CORE_ADDR sp, pc, bp_addr, bsp;
|
|
|
|
sp = get_frame_register_unsigned (this_frame, IA64_GR12_REGNUM);
|
|
|
|
/* Just double-check that the frame PC is within a certain region
|
|
of the stack that would be plausible for our dummy code (the dummy
|
|
code was pushed at SP + 16). If not, then return a null frame ID.
|
|
This is necessary in our case, because it is possible to produce
|
|
the same frame ID for a normal frame, if that frame corresponds
|
|
to the function called by our dummy code, and the function has not
|
|
modified the registers that we use to build the dummy frame ID. */
|
|
pc = get_frame_pc (this_frame);
|
|
if (pc < sp + 16 || pc >= sp + 16 + sizeof (ia64_hpux_dummy_code))
|
|
return null_frame_id;
|
|
|
|
/* The call sequence is such that the address of the dummy breakpoint
|
|
we inserted is stored in r5. */
|
|
bp_addr = get_frame_register_unsigned (this_frame, IA64_GR5_REGNUM);
|
|
|
|
bsp = get_frame_register_unsigned (this_frame, IA64_BSP_REGNUM);
|
|
|
|
return frame_id_build_special (sp, bp_addr, bsp);
|
|
}
|
|
|
|
/* Should be set to non-NULL if the ia64-hpux solib module is linked in.
|
|
This may not be the case because the shared library support code can
|
|
only be compiled on ia64-hpux. */
|
|
|
|
struct target_so_ops *ia64_hpux_so_ops = NULL;
|
|
|
|
/* The "find_global_pointer_from_solib" gdbarch_tdep routine for
|
|
ia64-hpux. */
|
|
|
|
static CORE_ADDR
|
|
ia64_hpux_find_global_pointer_from_solib (struct gdbarch *gdbarch,
|
|
CORE_ADDR faddr)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
struct target_ops *ops = ¤t_target;
|
|
gdb_byte buf[8];
|
|
LONGEST len;
|
|
|
|
len = target_read (ops, TARGET_OBJECT_HPUX_SOLIB_GOT,
|
|
paddress (gdbarch, faddr), buf, 0, sizeof (buf));
|
|
|
|
return extract_unsigned_integer (buf, len, byte_order);
|
|
}
|
|
|
|
static void
|
|
ia64_hpux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
tdep->size_of_register_frame = ia64_hpux_size_of_register_frame;
|
|
|
|
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
|
|
set_gdbarch_cannot_store_register (gdbarch, ia64_hpux_cannot_store_register);
|
|
|
|
/* Inferior functions must be called from stack. */
|
|
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
|
|
set_gdbarch_push_dummy_code (gdbarch, ia64_hpux_push_dummy_code);
|
|
tdep->infcall_ops = ia64_hpux_infcall_ops;
|
|
tdep->find_global_pointer_from_solib
|
|
= ia64_hpux_find_global_pointer_from_solib;
|
|
set_gdbarch_dummy_id (gdbarch, ia64_hpux_dummy_id);
|
|
|
|
if (ia64_hpux_so_ops)
|
|
set_solib_ops (gdbarch, ia64_hpux_so_ops);
|
|
}
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
extern initialize_file_ftype _initialize_ia64_hpux_tdep;
|
|
|
|
void
|
|
_initialize_ia64_hpux_tdep (void)
|
|
{
|
|
gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_HPUX_ELF,
|
|
ia64_hpux_init_abi);
|
|
}
|