| 1 | /* Common target dependent code for GDB on Alpha systems. |
| 2 | Copyright (C) 1993-2017 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 | #ifndef ALPHA_TDEP_H |
| 20 | #define ALPHA_TDEP_H |
| 21 | |
| 22 | struct regcache; |
| 23 | |
| 24 | /* Say how long (ordinary) registers are. This is a piece of bogosity |
| 25 | used in push_word and a few other places; register_size() is the |
| 26 | real way to know how big a register is. */ |
| 27 | #define ALPHA_REGISTER_SIZE 8 |
| 28 | |
| 29 | /* Number of machine registers. */ |
| 30 | #define ALPHA_NUM_REGS 67 |
| 31 | |
| 32 | /* Register numbers of various important registers. Note that most of |
| 33 | these values are "real" register numbers, and correspond to the |
| 34 | general registers of the machine. */ |
| 35 | |
| 36 | #define ALPHA_V0_REGNUM 0 /* Function integer return value */ |
| 37 | #define ALPHA_T7_REGNUM 8 /* Return address register for OSF/1 __add* */ |
| 38 | #define ALPHA_S0_REGNUM 9 /* First saved register */ |
| 39 | #define ALPHA_GCC_FP_REGNUM 15 /* Used by gcc as frame register */ |
| 40 | #define ALPHA_A0_REGNUM 16 /* Loc of first arg during a subr call */ |
| 41 | #define ALPHA_T9_REGNUM 23 /* Return address register for OSF/1 __div* */ |
| 42 | #define ALPHA_RA_REGNUM 26 /* Contains return address value */ |
| 43 | #define ALPHA_T12_REGNUM 27 /* Contains start addr of current proc */ |
| 44 | #define ALPHA_GP_REGNUM 29 /* Contains the global pointer */ |
| 45 | #define ALPHA_SP_REGNUM 30 /* Contains address of top of stack */ |
| 46 | #define ALPHA_ZERO_REGNUM 31 /* Read-only register, always 0 */ |
| 47 | #define ALPHA_FP0_REGNUM 32 /* Floating point register 0 */ |
| 48 | #define ALPHA_FPA0_REGNUM 48 /* First float arg during a subr call */ |
| 49 | #define ALPHA_FPCR_REGNUM 63 /* Floating point control register */ |
| 50 | #define ALPHA_PC_REGNUM 64 /* Contains program counter */ |
| 51 | #define ALPHA_UNIQUE_REGNUM 66 /* PAL_rduniq value */ |
| 52 | |
| 53 | /* Instruction size. */ |
| 54 | #define ALPHA_INSN_SIZE 4 |
| 55 | |
| 56 | /* The alpha has two different virtual pointers for arguments and locals. |
| 57 | |
| 58 | The virtual argument pointer is pointing to the bottom of the argument |
| 59 | transfer area, which is located immediately below the virtual frame |
| 60 | pointer. Its size is fixed for the native compiler, it is either zero |
| 61 | (for the no arguments case) or large enough to hold all argument registers. |
| 62 | gcc uses a variable sized argument transfer area. As it has |
| 63 | to stay compatible with the native debugging tools it has to use the same |
| 64 | virtual argument pointer and adjust the argument offsets accordingly. |
| 65 | |
| 66 | The virtual local pointer is localoff bytes below the virtual frame |
| 67 | pointer, the value of localoff is obtained from the PDR. */ |
| 68 | #define ALPHA_NUM_ARG_REGS 6 |
| 69 | |
| 70 | /* Target-dependent structure in gdbarch. */ |
| 71 | struct gdbarch_tdep |
| 72 | { |
| 73 | CORE_ADDR vm_min_address; /* Used by alpha_heuristic_proc_start. */ |
| 74 | |
| 75 | /* If PC is inside a dynamically-generated signal trampoline function |
| 76 | (i.e. one copied onto the user stack at run-time), return how many |
| 77 | bytes PC is beyond the start of that function. Otherwise, return -1. */ |
| 78 | LONGEST (*dynamic_sigtramp_offset) (struct gdbarch *, CORE_ADDR); |
| 79 | |
| 80 | /* Translate a signal handler stack base address into the address of |
| 81 | the sigcontext structure for that signal handler. */ |
| 82 | CORE_ADDR (*sigcontext_addr) (struct frame_info *); |
| 83 | |
| 84 | /* Does the PC fall in a signal trampoline. */ |
| 85 | /* NOTE: cagney/2004-04-30: Do not copy/clone this code. Instead |
| 86 | look at tramp-frame.h and other simplier per-architecture |
| 87 | sigtramp unwinders. */ |
| 88 | int (*pc_in_sigtramp) (struct gdbarch *gdbarch, CORE_ADDR pc, |
| 89 | const char *name); |
| 90 | |
| 91 | /* If TYPE will be returned in memory, return true. */ |
| 92 | int (*return_in_memory) (struct type *type); |
| 93 | |
| 94 | /* Offset of registers in `struct sigcontext'. */ |
| 95 | int sc_pc_offset; |
| 96 | int sc_regs_offset; |
| 97 | int sc_fpregs_offset; |
| 98 | |
| 99 | int jb_pc; /* Offset to PC value in jump buffer. |
| 100 | If htis is negative, longjmp support |
| 101 | will be disabled. */ |
| 102 | size_t jb_elt_size; /* And the size of each entry in the buf. */ |
| 103 | }; |
| 104 | |
| 105 | extern unsigned int alpha_read_insn (struct gdbarch *gdbarch, CORE_ADDR pc); |
| 106 | extern VEC (CORE_ADDR) *alpha_software_single_step (struct regcache *regcache); |
| 107 | extern CORE_ADDR alpha_after_prologue (CORE_ADDR pc); |
| 108 | |
| 109 | extern void alpha_mdebug_init_abi (struct gdbarch_info, struct gdbarch *); |
| 110 | extern void alpha_dwarf2_init_abi (struct gdbarch_info, struct gdbarch *); |
| 111 | |
| 112 | extern void alpha_supply_int_regs (struct regcache *, int, const void *, |
| 113 | const void *, const void *); |
| 114 | extern void alpha_fill_int_regs (const struct regcache *, int, |
| 115 | void *, void *, void *); |
| 116 | extern void alpha_supply_fp_regs (struct regcache *, int, |
| 117 | const void *, const void *); |
| 118 | extern void alpha_fill_fp_regs (const struct regcache *, |
| 119 | int, void *, void *); |
| 120 | |
| 121 | #endif /* ALPHA_TDEP_H */ |