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/* Native-dependent code for GNU/Linux m32r.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "linux-nat.h"
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#include "target.h"
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#include "nat/gdb_ptrace.h"
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#include <sys/user.h>
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#include <sys/procfs.h>
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#include "inf-ptrace.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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#include "m32r-tdep.h"
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class m32r_linux_nat_target final : public linux_nat_target
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{
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public:
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/* Add our register access methods. */
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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};
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static m32r_linux_nat_target the_m32r_linux_nat_target;
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/* Since EVB register is not available for native debug, we reduce
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the number of registers. */
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#define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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static int regmap[] = {
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4, 5, 6, 7, 0, 1, 2, 8,
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9, 10, 11, 12, 13, 24, 25, 23,
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19, 19, 26, 23, 22, 20, 16, 15
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};
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#define PSW_REGMAP 19
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#define BBPSW_REGMAP 21
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#define SPU_REGMAP 23
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#define SPI_REGMAP 26
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/* Doee (??) apply to the corresponding SET requests as well. */
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#define GETREGS_SUPPLIES(regno) (0 <= (regno) \
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&& (regno) <= M32R_LINUX_NUM_REGS)
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/* Transfering the general-purpose registers between GDB, inferiors
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and core files. */
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/* Fill GDB's register array with the general-purpose register values
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in *GREGSETP. */
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void
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supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)
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{
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const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
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int i;
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unsigned long psw, bbpsw;
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psw = *(regp + PSW_REGMAP);
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bbpsw = *(regp + BBPSW_REGMAP);
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for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
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{
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elf_greg_t regval;
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switch (i)
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{
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case PSW_REGNUM:
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regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
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break;
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case CBR_REGNUM:
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regval = ((psw >> 8) & 1);
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break;
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default:
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regval = *(regp + regmap[i]);
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break;
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}
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if (i != M32R_SP_REGNUM)
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regcache->raw_supply (i, ®val);
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else if (psw & 0x8000)
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regcache->raw_supply (i, regp + SPU_REGMAP);
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else
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regcache->raw_supply (i, regp + SPI_REGMAP);
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}
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}
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register array. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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supply_gregset (regcache, (const elf_gregset_t *) ®s);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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elf_gregset_t * gregsetp, int regno)
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{
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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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unsigned long psw, bbpsw, tmp;
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psw = *(regp + PSW_REGMAP);
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bbpsw = *(regp + BBPSW_REGMAP);
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for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
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{
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if (regno != -1 && regno != i)
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continue;
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if (i == CBR_REGNUM || i == PSW_REGNUM)
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continue;
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if (i == SPU_REGNUM || i == SPI_REGNUM)
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continue;
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if (i != M32R_SP_REGNUM)
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regcache->raw_collect (i, regp + regmap[i]);
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else if (psw & 0x8000)
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regcache->raw_collect (i, regp + SPU_REGMAP);
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else
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regcache->raw_collect (i, regp + SPI_REGMAP);
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}
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}
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/* Store all valid general-purpose registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regno)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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/* Transfering floating-point registers between GDB, inferiors and cores.
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Since M32R has no floating-point registers, these functions do nothing. */
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void
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supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
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{
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}
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void
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fill_fpregset (const struct regcache *regcache,
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gdb_fpregset_t *fpregs, int regno)
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{
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}
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/* Transferring arbitrary registers between GDB and inferior. */
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/* Fetch register REGNO from the child process. If REGNO is -1, do
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this for all registers (including the floating point and SSE
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registers). */
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void
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m32r_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
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{
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_GETREGS request whenever possible, since it
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transfers more registers in one system call, and we'll cache the
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results. */
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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fetch_regs (regcache, tid);
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return;
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}
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internal_error (__FILE__, __LINE__,
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_("Got request for bad register number %d."), regno);
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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do this for all registers (including the floating point and SSE
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registers). */
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void
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m32r_linux_nat_target::store_registers (struct regcache *regcache, int regno)
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{
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_SETREGS request whenever possible, since it
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transfers more registers in one system call. */
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if (regno == -1 || GETREGS_SUPPLIES (regno))
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{
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store_regs (regcache, tid, regno);
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return;
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}
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internal_error (__FILE__, __LINE__,
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_("Got request to store bad register number %d."), regno);
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}
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void _initialize_m32r_linux_nat ();
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void
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_initialize_m32r_linux_nat ()
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{
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/* Register the target. */
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linux_target = &the_m32r_linux_nat_target;
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add_inf_child_target (&the_m32r_linux_nat_target);
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}
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