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/* Ravenscar SPARC target support.
Copyright (C) 2004-2017 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 "gdbcore.h"
#include "regcache.h"
#include "sparc-tdep.h"
#include "inferior.h"
#include "ravenscar-thread.h"
#include "sparc-ravenscar-thread.h"
static void sparc_ravenscar_fetch_registers (struct regcache *regcache,
int regnum);
static void sparc_ravenscar_store_registers (struct regcache *regcache,
int regnum);
static void sparc_ravenscar_prepare_to_store (struct regcache *regcache);
/* Register offsets from a referenced address (exempli gratia the
Thread_Descriptor). The referenced address depends on the register
number. The Thread_Descriptor layout and the stack layout are documented
in the GNAT sources, in sparc-bb.h. */
static const int sparc_register_offsets[] =
{
/* G0 - G7 */
-1, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
/* O0 - O7 */
0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
/* L0 - L7 */
0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
/* I0 - I7 */
0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
/* F0 - F31 */
0x50, 0x54, 0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C,
0x70, 0x74, 0x78, 0x7C, 0x80, 0x84, 0x88, 0x8C,
0x90, 0x94, 0x99, 0x9C, 0xA0, 0xA4, 0xA8, 0xAC,
0xB0, 0xB4, 0xBB, 0xBC, 0xC0, 0xC4, 0xC8, 0xCC,
/* Y PSR WIM TBR PC NPC FPSR CPSR */
0x40, 0x20, 0x44, -1, 0x1C, -1, 0x4C, -1
};
/* supply register REGNUM, which has been saved on REGISTER_ADDR, to the
regcache. */
static void
supply_register_at_address (struct regcache *regcache, int regnum,
CORE_ADDR register_addr)
{
struct gdbarch *gdbarch = regcache->arch ();
int buf_size = register_size (gdbarch, regnum);
gdb_byte *buf;
buf = (gdb_byte *) alloca (buf_size);
read_memory (register_addr, buf, buf_size);
regcache_raw_supply (regcache, regnum, buf);
}
/* Return true if, for a non-running thread, REGNUM has been saved on the
stack. */
static int
register_on_stack_p (int regnum)
{
return (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
|| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM);
}
/* Return true if, for a non-running thread, REGNUM has been saved on the
Thread_Descriptor. */
static int
register_in_thread_descriptor_p (int regnum)
{
return (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
|| (regnum == SPARC32_PSR_REGNUM)
|| (regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
|| (regnum == SPARC32_Y_REGNUM)
|| (regnum == SPARC32_WIM_REGNUM)
|| (regnum == SPARC32_FSR_REGNUM)
|| (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F0_REGNUM + 31)
|| (regnum == SPARC32_PC_REGNUM);
}
/* to_fetch_registers when inferior_ptid is different from the running
thread. */
static void
sparc_ravenscar_fetch_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
const int sp_regnum = gdbarch_sp_regnum (gdbarch);
const int num_regs = gdbarch_num_regs (gdbarch);
int current_regnum;
CORE_ADDR current_address;
CORE_ADDR thread_descriptor_address;
ULONGEST stack_address;
/* The tid is the thread_id field, which is a pointer to the thread. */
thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid);
/* Read the saved SP in the context buffer. */
current_address = thread_descriptor_address
+ sparc_register_offsets [sp_regnum];
supply_register_at_address (regcache, sp_regnum, current_address);
regcache_cooked_read_unsigned (regcache, sp_regnum, &stack_address);
/* Read registers. */
for (current_regnum = 0; current_regnum < num_regs; current_regnum ++)
{
if (register_in_thread_descriptor_p (current_regnum))
{
current_address = thread_descriptor_address
+ sparc_register_offsets [current_regnum];
supply_register_at_address (regcache, current_regnum,
current_address);
}
else if (register_on_stack_p (current_regnum))
{
current_address = stack_address
+ sparc_register_offsets [current_regnum];
supply_register_at_address (regcache, current_regnum,
current_address);
}
}
}
/* to_prepare_to_store when inferior_ptid is different from the running
thread. */
static void
sparc_ravenscar_prepare_to_store (struct regcache *regcache)
{
/* Nothing to do. */
}
/* to_store_registers when inferior_ptid is different from the running
thread. */
static void
sparc_ravenscar_store_registers (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
int buf_size = register_size (gdbarch, regnum);
gdb_byte buf[buf_size];
ULONGEST register_address;
if (register_in_thread_descriptor_p (regnum))
register_address =
ptid_get_tid (inferior_ptid) + sparc_register_offsets [regnum];
else if (register_on_stack_p (regnum))
{
regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM,
®ister_address);
register_address += sparc_register_offsets [regnum];
}
else
return;
regcache_raw_collect (regcache, regnum, buf);
write_memory (register_address,
buf,
buf_size);
}
static struct ravenscar_arch_ops sparc_ravenscar_ops =
{
sparc_ravenscar_fetch_registers,
sparc_ravenscar_store_registers,
sparc_ravenscar_prepare_to_store
};
/* Register ravenscar_arch_ops in GDBARCH. */
void
register_sparc_ravenscar_ops (struct gdbarch *gdbarch)
{
set_gdbarch_ravenscar_ops (gdbarch, &sparc_ravenscar_ops);
}
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