| /* Native-dependent code for GNU/Linux m32r. |
| |
| Copyright (C) 2004-2021 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); |
| } |