1 /* Low level Alpha GNU/Linux interface, for GDB when running native. 2 Copyright (C) 2005-2024 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 #include "target.h" 20 #include "regcache.h" 21 #include "linux-nat-trad.h" 22 23 #include "alpha-tdep.h" 24 #include "gdbarch.h" 25 26 #include "nat/gdb_ptrace.h" 27 #include <alpha/ptrace.h> 28 29 #include <sys/procfs.h> 30 #include "gregset.h" 31 32 /* The address of UNIQUE for ptrace. */ 33 #define ALPHA_UNIQUE_PTRACE_ADDR 65 34 35 class alpha_linux_nat_target final : public linux_nat_trad_target 36 { 37 protected: 38 /* Override linux_nat_trad_target methods. */ 39 CORE_ADDR register_u_offset (struct gdbarch *gdbarch, 40 int regno, int store_p) override; 41 }; 42 43 static alpha_linux_nat_target the_alpha_linux_nat_target; 44 45 /* See the comment in m68k-tdep.c regarding the utility of these 46 functions. */ 47 48 void 49 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) 50 { 51 const long *regp = (const long *)gregsetp; 52 53 /* PC is in slot 32, UNIQUE is in slot 33. */ 54 alpha_supply_int_regs (regcache, -1, regp, regp + 31, regp + 32); 55 } 56 57 void 58 fill_gregset (const struct regcache *regcache, 59 gdb_gregset_t *gregsetp, int regno) 60 { 61 long *regp = (long *)gregsetp; 62 63 /* PC is in slot 32, UNIQUE is in slot 33. */ 64 alpha_fill_int_regs (regcache, regno, regp, regp + 31, regp + 32); 65 } 66 67 /* Now we do the same thing for floating-point registers. 68 Again, see the comments in m68k-tdep.c. */ 69 70 void 71 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) 72 { 73 const long *regp = (const long *)fpregsetp; 74 75 /* FPCR is in slot 32. */ 76 alpha_supply_fp_regs (regcache, -1, regp, regp + 31); 77 } 78 79 void 80 fill_fpregset (const struct regcache *regcache, 81 gdb_fpregset_t *fpregsetp, int regno) 82 { 83 long *regp = (long *)fpregsetp; 84 85 /* FPCR is in slot 32. */ 86 alpha_fill_fp_regs (regcache, regno, regp, regp + 31); 87 } 88 89 CORE_ADDR 90 alpha_linux_nat_target::register_u_offset (struct gdbarch *gdbarch, 91 int regno, int store_p) 92 { 93 if (regno == gdbarch_pc_regnum (gdbarch)) 94 return PC; 95 if (regno == ALPHA_UNIQUE_REGNUM) 96 return ALPHA_UNIQUE_PTRACE_ADDR; 97 if (regno < gdbarch_fp0_regnum (gdbarch)) 98 return GPR_BASE + regno; 99 else 100 return FPR_BASE + regno - gdbarch_fp0_regnum (gdbarch); 101 } 102 103 void _initialize_alpha_linux_nat (); 104 void 105 _initialize_alpha_linux_nat () 106 { 107 linux_target = &the_alpha_linux_nat_target; 108 add_inf_child_target (&the_alpha_linux_nat_target); 109 } 110