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- /* Target dependent code for GDB on TI C6x systems.
- Copyright (C) 2010-2022 Free Software Foundation, Inc.
- Contributed by Andrew Jenner <andrew@codesourcery.com>
- Contributed by Yao Qi <yao@codesourcery.com>
- 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 "server.h"
- #include "linux-low.h"
- #include "arch/tic6x.h"
- #include "tdesc.h"
- #include "nat/gdb_ptrace.h"
- #include <endian.h>
- #include "gdb_proc_service.h"
- #ifndef PTRACE_GET_THREAD_AREA
- #define PTRACE_GET_THREAD_AREA 25
- #endif
- /* There are at most 69 registers accessible in ptrace. */
- #define TIC6X_NUM_REGS 69
- #include <asm/ptrace.h>
- /* Linux target op definitions for the TI C6x architecture. */
- class tic6x_target : public linux_process_target
- {
- public:
- const regs_info *get_regs_info () override;
- const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
- protected:
- void low_arch_setup () override;
- bool low_cannot_fetch_register (int regno) override;
- bool low_cannot_store_register (int regno) override;
- bool low_supports_breakpoints () override;
- CORE_ADDR low_get_pc (regcache *regcache) override;
- void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
- bool low_breakpoint_at (CORE_ADDR pc) override;
- };
- /* The singleton target ops object. */
- static tic6x_target the_tic6x_target;
- /* Defined in auto-generated file tic6x-c64xp-linux.c. */
- void init_registers_tic6x_c64xp_linux (void);
- extern const struct target_desc *tdesc_tic6x_c64xp_linux;
- /* Defined in auto-generated file tic6x-c64x-linux.c. */
- void init_registers_tic6x_c64x_linux (void);
- extern const struct target_desc *tdesc_tic6x_c64x_linux;
- /* Defined in auto-generated file tic62x-c6xp-linux.c. */
- void init_registers_tic6x_c62x_linux (void);
- extern const struct target_desc *tdesc_tic6x_c62x_linux;
- union tic6x_register
- {
- unsigned char buf[4];
- int reg32;
- };
- /* Return the ptrace ``address'' of register REGNO. */
- #if __BYTE_ORDER == __BIG_ENDIAN
- static int tic6x_regmap_c64xp[] = {
- /* A0 - A15 */
- 53, 52, 55, 54, 57, 56, 59, 58,
- 61, 60, 63, 62, 65, 64, 67, 66,
- /* B0 - B15 */
- 23, 22, 25, 24, 27, 26, 29, 28,
- 31, 30, 33, 32, 35, 34, 69, 68,
- /* CSR PC */
- 5, 4,
- /* A16 - A31 */
- 37, 36, 39, 38, 41, 40, 43, 42,
- 45, 44, 47, 46, 49, 48, 51, 50,
- /* B16 - B31 */
- 7, 6, 9, 8, 11, 10, 13, 12,
- 15, 14, 17, 16, 19, 18, 21, 20,
- /* TSR, ILC, RILC */
- 1, 2, 3
- };
- static int tic6x_regmap_c64x[] = {
- /* A0 - A15 */
- 51, 50, 53, 52, 55, 54, 57, 56,
- 59, 58, 61, 60, 63, 62, 65, 64,
- /* B0 - B15 */
- 21, 20, 23, 22, 25, 24, 27, 26,
- 29, 28, 31, 30, 33, 32, 67, 66,
- /* CSR PC */
- 3, 2,
- /* A16 - A31 */
- 35, 34, 37, 36, 39, 38, 41, 40,
- 43, 42, 45, 44, 47, 46, 49, 48,
- /* B16 - B31 */
- 5, 4, 7, 6, 9, 8, 11, 10,
- 13, 12, 15, 14, 17, 16, 19, 18,
- -1, -1, -1
- };
- static int tic6x_regmap_c62x[] = {
- /* A0 - A15 */
- 19, 18, 21, 20, 23, 22, 25, 24,
- 27, 26, 29, 28, 31, 30, 33, 32,
- /* B0 - B15 */
- 5, 4, 7, 6, 9, 8, 11, 10,
- 13, 12, 15, 14, 17, 16, 35, 34,
- /* CSR, PC */
- 3, 2,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1
- };
- #else
- static int tic6x_regmap_c64xp[] = {
- /* A0 - A15 */
- 52, 53, 54, 55, 56, 57, 58, 59,
- 60, 61, 62, 63, 64, 65, 66, 67,
- /* B0 - B15 */
- 22, 23, 24, 25, 26, 27, 28, 29,
- 30, 31, 32, 33, 34, 35, 68, 69,
- /* CSR PC */
- 4, 5,
- /* A16 - A31 */
- 36, 37, 38, 39, 40, 41, 42, 43,
- 44, 45, 46, 47, 48, 49, 50, 51,
- /* B16 -B31 */
- 6, 7, 8, 9, 10, 11, 12, 13,
- 14, 15, 16, 17, 18, 19, 20, 31,
- /* TSR, ILC, RILC */
- 0, 3, 2
- };
- static int tic6x_regmap_c64x[] = {
- /* A0 - A15 */
- 50, 51, 52, 53, 54, 55, 56, 57,
- 58, 59, 60, 61, 62, 63, 64, 65,
- /* B0 - B15 */
- 20, 21, 22, 23, 24, 25, 26, 27,
- 28, 29, 30, 31, 32, 33, 66, 67,
- /* CSR PC */
- 2, 3,
- /* A16 - A31 */
- 34, 35, 36, 37, 38, 39, 40, 41,
- 42, 43, 44, 45, 46, 47, 48, 49,
- /* B16 - B31 */
- 4, 5, 6, 7, 8, 9, 10, 11,
- 12, 13, 14, 15, 16, 17, 18, 19,
- -1, -1, -1
- };
- static int tic6x_regmap_c62x[] = {
- /* A0 - A15 */
- 18, 19, 20, 21, 22, 23, 24, 25,
- 26, 27, 28, 29, 30, 31, 32, 33,
- /* B0 - B15 */
- 4, 5, 6, 7, 8, 9, 10, 11,
- 12, 13, 14, 15, 16, 17, 34, 35,
- /* CSR PC */
- 2, 3,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1
- };
- #endif
- static int *tic6x_regmap;
- static unsigned int tic6x_breakpoint;
- #define tic6x_breakpoint_len 4
- /* Implementation of target ops method "sw_breakpoint_from_kind". */
- const gdb_byte *
- tic6x_target::sw_breakpoint_from_kind (int kind, int *size)
- {
- *size = tic6x_breakpoint_len;
- return (const gdb_byte *) &tic6x_breakpoint;
- }
- static struct usrregs_info tic6x_usrregs_info =
- {
- TIC6X_NUM_REGS,
- NULL, /* Set in tic6x_read_description. */
- };
- static const struct target_desc *
- tic6x_read_description (enum c6x_feature feature)
- {
- static target_desc *tdescs[C6X_LAST] = { };
- struct target_desc **tdesc = &tdescs[feature];
- if (*tdesc == NULL)
- {
- *tdesc = tic6x_create_target_description (feature);
- static const char *expedite_regs[] = { "A15", "PC", NULL };
- init_target_desc (*tdesc, expedite_regs);
- }
- return *tdesc;
- }
- bool
- tic6x_target::low_cannot_fetch_register (int regno)
- {
- return (tic6x_regmap[regno] == -1);
- }
- bool
- tic6x_target::low_cannot_store_register (int regno)
- {
- return (tic6x_regmap[regno] == -1);
- }
- bool
- tic6x_target::low_supports_breakpoints ()
- {
- return true;
- }
- CORE_ADDR
- tic6x_target::low_get_pc (regcache *regcache)
- {
- union tic6x_register pc;
- collect_register_by_name (regcache, "PC", pc.buf);
- return pc.reg32;
- }
- void
- tic6x_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
- {
- union tic6x_register newpc;
- newpc.reg32 = pc;
- supply_register_by_name (regcache, "PC", newpc.buf);
- }
- bool
- tic6x_target::low_breakpoint_at (CORE_ADDR where)
- {
- unsigned int insn;
- read_memory (where, (unsigned char *) &insn, 4);
- if (insn == tic6x_breakpoint)
- return true;
- /* If necessary, recognize more trap instructions here. GDB only uses the
- one. */
- return false;
- }
- /* Fetch the thread-local storage pointer for libthread_db. */
- ps_err_e
- ps_get_thread_area (struct ps_prochandle *ph,
- lwpid_t lwpid, int idx, void **base)
- {
- if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
- return PS_ERR;
- /* IDX is the bias from the thread pointer to the beginning of the
- thread descriptor. It has to be subtracted due to implementation
- quirks in libthread_db. */
- *base = (void *) ((char *) *base - idx);
- return PS_OK;
- }
- static void
- tic6x_collect_register (struct regcache *regcache, int regno,
- union tic6x_register *reg)
- {
- union tic6x_register tmp_reg;
- collect_register (regcache, regno, &tmp_reg.reg32);
- reg->reg32 = tmp_reg.reg32;
- }
- static void
- tic6x_supply_register (struct regcache *regcache, int regno,
- const union tic6x_register *reg)
- {
- int offset = 0;
- supply_register (regcache, regno, reg->buf + offset);
- }
- static void
- tic6x_fill_gregset (struct regcache *regcache, void *buf)
- {
- auto regset = static_cast<union tic6x_register *> (buf);
- int i;
- for (i = 0; i < TIC6X_NUM_REGS; i++)
- if (tic6x_regmap[i] != -1)
- tic6x_collect_register (regcache, i, regset + tic6x_regmap[i]);
- }
- static void
- tic6x_store_gregset (struct regcache *regcache, const void *buf)
- {
- const auto regset = static_cast<const union tic6x_register *> (buf);
- int i;
- for (i = 0; i < TIC6X_NUM_REGS; i++)
- if (tic6x_regmap[i] != -1)
- tic6x_supply_register (regcache, i, regset + tic6x_regmap[i]);
- }
- static struct regset_info tic6x_regsets[] = {
- { PTRACE_GETREGS, PTRACE_SETREGS, 0, TIC6X_NUM_REGS * 4, GENERAL_REGS,
- tic6x_fill_gregset, tic6x_store_gregset },
- NULL_REGSET
- };
- void
- tic6x_target::low_arch_setup ()
- {
- register unsigned int csr asm ("B2");
- unsigned int cpuid;
- enum c6x_feature feature = C6X_CORE;
- /* Determine the CPU we're running on to find the register order. */
- __asm__ ("MVC .S2 CSR,%0" : "=r" (csr) :);
- cpuid = csr >> 24;
- switch (cpuid)
- {
- case 0x00: /* C62x */
- case 0x02: /* C67x */
- tic6x_regmap = tic6x_regmap_c62x;
- tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
- feature = C6X_CORE;
- break;
- case 0x03: /* C67x+ */
- tic6x_regmap = tic6x_regmap_c64x;
- tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
- feature = C6X_GP;
- break;
- case 0x0c: /* C64x */
- tic6x_regmap = tic6x_regmap_c64x;
- tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
- feature = C6X_GP;
- break;
- case 0x10: /* C64x+ */
- case 0x14: /* C674x */
- case 0x15: /* C66x */
- tic6x_regmap = tic6x_regmap_c64xp;
- tic6x_breakpoint = 0x56454314; /* illegal opcode */
- feature = C6X_C6XP;
- break;
- default:
- error ("Unknown CPU ID 0x%02x", cpuid);
- }
- tic6x_usrregs_info.regmap = tic6x_regmap;
- current_process ()->tdesc = tic6x_read_description (feature);
- }
- static struct regsets_info tic6x_regsets_info =
- {
- tic6x_regsets, /* regsets */
- 0, /* num_regsets */
- NULL, /* disabled_regsets */
- };
- static struct regs_info myregs_info =
- {
- NULL, /* regset_bitmap */
- &tic6x_usrregs_info,
- &tic6x_regsets_info
- };
- const regs_info *
- tic6x_target::get_regs_info ()
- {
- return &myregs_info;
- }
- #if GDB_SELF_TEST
- #include "gdbsupport/selftest.h"
- namespace selftests {
- namespace tdesc {
- static void
- tic6x_tdesc_test ()
- {
- SELF_CHECK (*tdesc_tic6x_c62x_linux == *tic6x_read_description (C6X_CORE));
- SELF_CHECK (*tdesc_tic6x_c64x_linux == *tic6x_read_description (C6X_GP));
- SELF_CHECK (*tdesc_tic6x_c64xp_linux == *tic6x_read_description (C6X_C6XP));
- }
- }
- }
- #endif
- /* The linux target ops object. */
- linux_process_target *the_linux_target = &the_tic6x_target;
- void
- initialize_low_arch (void)
- {
- #if GDB_SELF_TEST
- /* Initialize the Linux target descriptions. */
- init_registers_tic6x_c64xp_linux ();
- init_registers_tic6x_c64x_linux ();
- init_registers_tic6x_c62x_linux ();
- selftests::register_test ("tic6x-tdesc", selftests::tdesc::tic6x_tdesc_test);
- #endif
- initialize_regsets_info (&tic6x_regsets_info);
- }
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