diff options
| -rw-r--r-- | gdb/ChangeLog | 8 | ||||
| -rw-r--r-- | gdb/Makefile.in | 1 | ||||
| -rw-r--r-- | gdb/arc-linux-tdep.c | 278 | ||||
| -rw-r--r-- | gdb/arc-tdep.c | 3 | ||||
| -rw-r--r-- | gdb/arc-tdep.h | 5 | ||||
| -rw-r--r-- | gdb/configure.tgt | 5 |
6 files changed, 298 insertions, 2 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 2e97cdc..150a7af 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,11 @@ +2020-08-25 Anton Kolesov <anton.kolesov@synopsys.com> + + * configure.tgt: ARC support for GNU/Linux. + * Makefile.in (ALL_TARGET_OBJS): Likewise. + * arc-linux-tdep.c: New file. + * arc-tdep.h (ARC_STATUS32_L_MASK, ARC_STATUS32_DE_MASK): Declare. + * arc-tdep.c (arc_write_pc): Use it. + 2020-08-25 Shahab Vahedi <shahab@synopsys.com> * arc-tdep.c (arc_check_for_hardware_loop): New. diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 66abac4..4808357 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -702,6 +702,7 @@ ALL_64_TARGET_OBS = \ # All other target-dependent objects files (used with --enable-targets=all). ALL_TARGET_OBS = \ aarch32-tdep.o \ + arc-linux-tdep.o \ arc-tdep.o \ arch/aarch32.o \ arch/arc.o \ diff --git a/gdb/arc-linux-tdep.c b/gdb/arc-linux-tdep.c new file mode 100644 index 0000000..36f3245 --- /dev/null +++ b/gdb/arc-linux-tdep.c @@ -0,0 +1,278 @@ +/* Target dependent code for GNU/Linux ARC. + + Copyright 2020 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/>. */ + +/* GDB header files. */ +#include "defs.h" +#include "linux-tdep.h" +#include "objfiles.h" +#include "opcode/arc.h" +#include "osabi.h" +#include "solib-svr4.h" + +/* ARC header files. */ +#include "opcodes/arc-dis.h" +#include "arc-tdep.h" + +/* Implement the "cannot_fetch_register" gdbarch method. */ + +static int +arc_linux_cannot_fetch_register (struct gdbarch *gdbarch, int regnum) +{ + /* Assume that register is readable if it is unknown. */ + switch (regnum) + { + case ARC_ILINK_REGNUM: + case ARC_RESERVED_REGNUM: + case ARC_LIMM_REGNUM: + return true; + case ARC_R30_REGNUM: + case ARC_R58_REGNUM: + case ARC_R59_REGNUM: + return !arc_mach_is_arcv2 (gdbarch); + } + return (regnum > ARC_BLINK_REGNUM) && (regnum < ARC_LP_COUNT_REGNUM); +} + +/* Implement the "cannot_store_register" gdbarch method. */ + +static int +arc_linux_cannot_store_register (struct gdbarch *gdbarch, int regnum) +{ + /* Assume that register is writable if it is unknown. */ + switch (regnum) + { + case ARC_ILINK_REGNUM: + case ARC_RESERVED_REGNUM: + case ARC_LIMM_REGNUM: + case ARC_PCL_REGNUM: + return true; + case ARC_R30_REGNUM: + case ARC_R58_REGNUM: + case ARC_R59_REGNUM: + return !arc_mach_is_arcv2 (gdbarch); + } + return (regnum > ARC_BLINK_REGNUM) && (regnum < ARC_LP_COUNT_REGNUM); +} + +/* For ARC Linux, breakpoints use the 16-bit TRAP_S 1 instruction, which + is 0x3e78 (little endian) or 0x783e (big endian). */ + +static const gdb_byte arc_linux_trap_s_be[] = { 0x78, 0x3e }; +static const gdb_byte arc_linux_trap_s_le[] = { 0x3e, 0x78 }; +static const int trap_size = 2; /* Number of bytes to insert "trap". */ + +/* Implement the "breakpoint_kind_from_pc" gdbarch method. */ + +static int +arc_linux_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr) +{ + return trap_size; +} + +/* Implement the "sw_breakpoint_from_kind" gdbarch method. */ + +static const gdb_byte * +arc_linux_sw_breakpoint_from_kind (struct gdbarch *gdbarch, + int kind, int *size) +{ + *size = kind; + return ((gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) + ? arc_linux_trap_s_be + : arc_linux_trap_s_le); +} + +/* Implement the "software_single_step" gdbarch method. */ + +static std::vector<CORE_ADDR> +arc_linux_software_single_step (struct regcache *regcache) +{ + struct gdbarch *gdbarch = regcache->arch (); + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + struct disassemble_info di = arc_disassemble_info (gdbarch); + + /* Read current instruction. */ + struct arc_instruction curr_insn; + arc_insn_decode (regcache_read_pc (regcache), &di, arc_delayed_print_insn, + &curr_insn); + CORE_ADDR next_pc = arc_insn_get_linear_next_pc (curr_insn); + + std::vector<CORE_ADDR> next_pcs; + + /* For instructions with delay slots, the fall thru is not the + instruction immediately after the current instruction, but the one + after that. */ + if (curr_insn.has_delay_slot) + { + struct arc_instruction next_insn; + arc_insn_decode (next_pc, &di, arc_delayed_print_insn, &next_insn); + next_pcs.push_back (arc_insn_get_linear_next_pc (next_insn)); + } + else + next_pcs.push_back (next_pc); + + ULONGEST status32; + regcache_cooked_read_unsigned (regcache, gdbarch_ps_regnum (gdbarch), + &status32); + + if (curr_insn.is_control_flow) + { + CORE_ADDR branch_pc = arc_insn_get_branch_target (curr_insn); + if (branch_pc != next_pc) + next_pcs.push_back (branch_pc); + } + /* Is current instruction the last in a loop body? */ + else if (tdep->has_hw_loops) + { + /* If STATUS32.L is 1, then ZD-loops are disabled. */ + if ((status32 & ARC_STATUS32_L_MASK) == 0) + { + ULONGEST lp_end, lp_start, lp_count; + regcache_cooked_read_unsigned (regcache, ARC_LP_START_REGNUM, + &lp_start); + regcache_cooked_read_unsigned (regcache, ARC_LP_END_REGNUM, &lp_end); + regcache_cooked_read_unsigned (regcache, ARC_LP_COUNT_REGNUM, + &lp_count); + + if (arc_debug) + { + debug_printf ("arc-linux: lp_start = %s, lp_end = %s, " + "lp_count = %s, next_pc = %s\n", + paddress (gdbarch, lp_start), + paddress (gdbarch, lp_end), + pulongest (lp_count), + paddress (gdbarch, next_pc)); + } + + if (next_pc == lp_end && lp_count > 1) + { + /* The instruction is in effect a jump back to the start of + the loop. */ + next_pcs.push_back (lp_start); + } + } + } + + /* Is this a delay slot? Then next PC is in BTA register. */ + if ((status32 & ARC_STATUS32_DE_MASK) != 0) + { + ULONGEST bta; + regcache_cooked_read_unsigned (regcache, ARC_BTA_REGNUM, &bta); + next_pcs.push_back (bta); + } + + return next_pcs; +} + +/* Implement the "skip_solib_resolver" gdbarch method. + + See glibc_skip_solib_resolver for details. */ + +static CORE_ADDR +arc_linux_skip_solib_resolver (struct gdbarch *gdbarch, CORE_ADDR pc) +{ + /* For uClibc 0.9.26+. + + An unresolved PLT entry points to "__dl_linux_resolve", which calls + "_dl_linux_resolver" to do the resolving and then eventually jumps to + the function. + + So we look for the symbol `_dl_linux_resolver', and if we are there, + gdb sets a breakpoint at the return address, and continues. */ + struct bound_minimal_symbol resolver + = lookup_minimal_symbol ("_dl_linux_resolver", NULL, NULL); + + if (arc_debug) + { + if (resolver.minsym != nullptr) + { + CORE_ADDR res_addr = BMSYMBOL_VALUE_ADDRESS (resolver); + debug_printf ("arc-linux: skip_solib_resolver (): " + "pc = %s, resolver at %s\n", + print_core_address (gdbarch, pc), + print_core_address (gdbarch, res_addr)); + } + else + { + debug_printf ("arc-linux: skip_solib_resolver (): " + "pc = %s, no resolver found\n", + print_core_address (gdbarch, pc)); + } + } + + if (resolver.minsym != nullptr && BMSYMBOL_VALUE_ADDRESS (resolver) == pc) + { + /* Find the return address. */ + return frame_unwind_caller_pc (get_current_frame ()); + } + else + { + /* No breakpoint required. */ + return 0; + } +} + +/* Initialization specific to Linux environment. */ + +static void +arc_linux_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + if (arc_debug) + debug_printf ("arc-linux: GNU/Linux OS/ABI initialization.\n"); + + /* If we are using Linux, we have in uClibc + (libc/sysdeps/linux/arc/bits/setjmp.h): + + typedef int __jmp_buf[13+1+1+1]; //r13-r25, fp, sp, blink + + Where "blink" is a stored PC of a caller function. + */ + tdep->jb_pc = 15; + + linux_init_abi (info, gdbarch); + + /* Set up target dependent GDB architecture entries. */ + set_gdbarch_cannot_fetch_register (gdbarch, arc_linux_cannot_fetch_register); + set_gdbarch_cannot_store_register (gdbarch, arc_linux_cannot_store_register); + set_gdbarch_breakpoint_kind_from_pc (gdbarch, + arc_linux_breakpoint_kind_from_pc); + set_gdbarch_sw_breakpoint_from_kind (gdbarch, + arc_linux_sw_breakpoint_from_kind); + set_gdbarch_fetch_tls_load_module_address (gdbarch, + svr4_fetch_objfile_link_map); + set_gdbarch_software_single_step (gdbarch, arc_linux_software_single_step); + set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); + set_gdbarch_skip_solib_resolver (gdbarch, arc_linux_skip_solib_resolver); + + /* GNU/Linux uses SVR4-style shared libraries, with 32-bit ints, longs + and pointers (ILP32). */ + set_solib_svr4_fetch_link_map_offsets (gdbarch, + svr4_ilp32_fetch_link_map_offsets); +} + +/* Suppress warning from -Wmissing-prototypes. */ +extern initialize_file_ftype _initialize_arc_linux_tdep; + +void +_initialize_arc_linux_tdep () +{ + gdbarch_register_osabi (bfd_arch_arc, 0, GDB_OSABI_LINUX, + arc_linux_init_osabi); +} diff --git a/gdb/arc-tdep.c b/gdb/arc-tdep.c index 8b4e285..6f544bf 100644 --- a/gdb/arc-tdep.c +++ b/gdb/arc-tdep.c @@ -612,8 +612,7 @@ arc_write_pc (struct regcache *regcache, CORE_ADDR new_pc) regcache_cooked_read_unsigned (regcache, gdbarch_ps_regnum (gdbarch), &status32); - /* Mask for DE bit is 0x40. */ - if (status32 & 0x40) + if ((status32 & ARC_STATUS32_DE_MASK) != 0) { if (arc_debug) { diff --git a/gdb/arc-tdep.h b/gdb/arc-tdep.h index e752348..6331d29 100644 --- a/gdb/arc-tdep.h +++ b/gdb/arc-tdep.h @@ -100,6 +100,11 @@ enum arc_regnum Longer registers are represented as pairs of 32-bit registers. */ #define ARC_REGISTER_SIZE 4 +/* STATUS32 register: hardware loops disabled bit. */ +#define ARC_STATUS32_L_MASK (1 << 12) +/* STATUS32 register: current instruction is a delay slot. */ +#define ARC_STATUS32_DE_MASK (1 << 6) + #define arc_print(fmt, args...) fprintf_unfiltered (gdb_stdlog, fmt, ##args) extern int arc_debug; diff --git a/gdb/configure.tgt b/gdb/configure.tgt index 8a26bde..a3e11c4 100644 --- a/gdb/configure.tgt +++ b/gdb/configure.tgt @@ -157,6 +157,11 @@ arc*-*-elf32) gdb_target_obs="arc-newlib-tdep.o" ;; +arc*-*-linux*) + # Target: ARC machine running Linux + gdb_target_obs="arc-linux-tdep.o linux-tdep.o solib-svr4.o" + ;; + arm*-wince-pe | arm*-*-mingw32ce*) # Target: ARM based machine running Windows CE (win32) gdb_target_obs="arm-wince-tdep.o windows-tdep.o" |