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- /* Native-dependent code for GNU/Linux m32r.
- Copyright (C) 2004-2022 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 "inferior.h"
- #include "gdbcore.h"
- #include "regcache.h"
- #include "linux-nat.h"
- #include "target.h"
- #include "nat/gdb_ptrace.h"
- #include <sys/user.h>
- #include <sys/procfs.h>
- #include "inf-ptrace.h"
- /* Prototypes for supply_gregset etc. */
- #include "gregset.h"
- #include "m32r-tdep.h"
- class m32r_linux_nat_target final : public linux_nat_target
- {
- public:
- /* Add our register access methods. */
- void fetch_registers (struct regcache *, int) override;
- void store_registers (struct regcache *, int) override;
- };
- static m32r_linux_nat_target the_m32r_linux_nat_target;
- /* Since EVB register is not available for native debug, we reduce
- the number of registers. */
- #define M32R_LINUX_NUM_REGS (M32R_NUM_REGS - 1)
- /* Mapping between the general-purpose registers in `struct user'
- format and GDB's register array layout. */
- static int regmap[] = {
- 4, 5, 6, 7, 0, 1, 2, 8,
- 9, 10, 11, 12, 13, 24, 25, 23,
- 19, 19, 26, 23, 22, 20, 16, 15
- };
- #define PSW_REGMAP 19
- #define BBPSW_REGMAP 21
- #define SPU_REGMAP 23
- #define SPI_REGMAP 26
- /* Doee (??) apply to the corresponding SET requests as well. */
- #define GETREGS_SUPPLIES(regno) (0 <= (regno) \
- && (regno) <= M32R_LINUX_NUM_REGS)
- /* Transfering the general-purpose registers between GDB, inferiors
- and core files. */
- /* Fill GDB's register array with the general-purpose register values
- in *GREGSETP. */
- void
- supply_gregset (struct regcache *regcache, const elf_gregset_t * gregsetp)
- {
- const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
- int i;
- unsigned long psw, bbpsw;
- psw = *(regp + PSW_REGMAP);
- bbpsw = *(regp + BBPSW_REGMAP);
- for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
- {
- elf_greg_t regval;
- switch (i)
- {
- case PSW_REGNUM:
- regval = ((0x00c1 & bbpsw) << 8) | ((0xc100 & psw) >> 8);
- break;
- case CBR_REGNUM:
- regval = ((psw >> 8) & 1);
- break;
- default:
- regval = *(regp + regmap[i]);
- break;
- }
- if (i != M32R_SP_REGNUM)
- regcache->raw_supply (i, ®val);
- else if (psw & 0x8000)
- regcache->raw_supply (i, regp + SPU_REGMAP);
- else
- regcache->raw_supply (i, regp + SPI_REGMAP);
- }
- }
- /* Fetch all general-purpose registers from process/thread TID and
- store their values in GDB's register array. */
- static void
- fetch_regs (struct regcache *regcache, int tid)
- {
- elf_gregset_t regs;
- if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name (_("Couldn't get registers"));
- supply_gregset (regcache, (const elf_gregset_t *) ®s);
- }
- /* Fill register REGNO (if it is a general-purpose register) in
- *GREGSETPS with the value in GDB's register array. If REGNO is -1,
- do this for all registers. */
- void
- fill_gregset (const struct regcache *regcache,
- elf_gregset_t * gregsetp, int regno)
- {
- elf_greg_t *regp = (elf_greg_t *) gregsetp;
- int i;
- unsigned long psw, bbpsw, tmp;
- psw = *(regp + PSW_REGMAP);
- bbpsw = *(regp + BBPSW_REGMAP);
- for (i = 0; i < M32R_LINUX_NUM_REGS; i++)
- {
- if (regno != -1 && regno != i)
- continue;
- if (i == CBR_REGNUM || i == PSW_REGNUM)
- continue;
- if (i == SPU_REGNUM || i == SPI_REGNUM)
- continue;
- if (i != M32R_SP_REGNUM)
- regcache->raw_collect (i, regp + regmap[i]);
- else if (psw & 0x8000)
- regcache->raw_collect (i, regp + SPU_REGMAP);
- else
- regcache->raw_collect (i, regp + SPI_REGMAP);
- }
- }
- /* Store all valid general-purpose registers in GDB's register array
- into the process/thread specified by TID. */
- static void
- store_regs (const struct regcache *regcache, int tid, int regno)
- {
- elf_gregset_t regs;
- if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name (_("Couldn't get registers"));
- fill_gregset (regcache, ®s, regno);
- if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
- perror_with_name (_("Couldn't write registers"));
- }
- /* Transfering floating-point registers between GDB, inferiors and cores.
- Since M32R has no floating-point registers, these functions do nothing. */
- void
- supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregs)
- {
- }
- void
- fill_fpregset (const struct regcache *regcache,
- gdb_fpregset_t *fpregs, int regno)
- {
- }
- /* Transferring arbitrary registers between GDB and inferior. */
- /* Fetch register REGNO from the child process. If REGNO is -1, do
- this for all registers (including the floating point and SSE
- registers). */
- void
- m32r_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
- {
- pid_t tid = get_ptrace_pid (regcache->ptid ());
- /* Use the PTRACE_GETREGS request whenever possible, since it
- transfers more registers in one system call, and we'll cache the
- results. */
- if (regno == -1 || GETREGS_SUPPLIES (regno))
- {
- fetch_regs (regcache, tid);
- return;
- }
- internal_error (__FILE__, __LINE__,
- _("Got request for bad register number %d."), regno);
- }
- /* Store register REGNO back into the child process. If REGNO is -1,
- do this for all registers (including the floating point and SSE
- registers). */
- void
- m32r_linux_nat_target::store_registers (struct regcache *regcache, int regno)
- {
- pid_t tid = get_ptrace_pid (regcache->ptid ());
- /* Use the PTRACE_SETREGS request whenever possible, since it
- transfers more registers in one system call. */
- if (regno == -1 || GETREGS_SUPPLIES (regno))
- {
- store_regs (regcache, tid, regno);
- return;
- }
- internal_error (__FILE__, __LINE__,
- _("Got request to store bad register number %d."), regno);
- }
- void _initialize_m32r_linux_nat ();
- void
- _initialize_m32r_linux_nat ()
- {
- /* Register the target. */
- linux_target = &the_m32r_linux_nat_target;
- add_inf_child_target (&the_m32r_linux_nat_target);
- }
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