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binutils-gdb/gdb/s390-tdep.h
Simon Marchi 8480a37e14 gdb: pass frames as const frame_info_ptr & 
We currently pass frames to function by value, as `frame_info_ptr`.
This is somewhat expensive:

 - the size of `frame_info_ptr` is 64 bytes, which is a bit big to pass
   by value
 - the constructors and destructor link/unlink the object in the global
   `frame_info_ptr::frame_list` list.  This is an `intrusive_list`, so
   it's not so bad: it's just assigning a few points, there's no memory
   allocation as if it was `std::list`, but still it's useless to do
   that over and over.

As suggested by Tom Tromey, change many function signatures to accept
`const frame_info_ptr &` instead of `frame_info_ptr`.

Some functions reassign their `frame_info_ptr` parameter, like:

  void
  the_func (frame_info_ptr frame)
  {
    for (; frame != nullptr; frame = get_prev_frame (frame))
      {
        ...
      }
  }

I wondered what to do about them, do I leave them as-is or change them
(and need to introduce a separate local variable that can be
re-assigned).  I opted for the later for consistency.  It might not be
clear why some functions take `const frame_info_ptr &` while others take
`frame_info_ptr`.  Also, if a function took a `frame_info_ptr` because
it did re-assign its parameter, I doubt that we would think to change it
to `const frame_info_ptr &` should the implementation change such that
it doesn't need to take `frame_info_ptr` anymore.  It seems better to
have a simple rule and apply it everywhere.

Change-Id: I59d10addef687d157f82ccf4d54f5dde9a963fd0
Approved-By: Andrew Burgess <aburgess@redhat.com>
2024-02-20 10:42:25 -05:00

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/* Target-dependent code for s390.
Copyright (C) 2003-2024 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/>. */
#ifndef S390_TDEP_H
#define S390_TDEP_H
#include "prologue-value.h"
#include "gdbarch.h"
enum s390_abi_kind
{
ABI_NONE,
ABI_LINUX_S390,
ABI_LINUX_ZSERIES
};
enum s390_vector_abi_kind
{
S390_VECTOR_ABI_NONE,
S390_VECTOR_ABI_128
};
/* The tdep structure. */
struct s390_gdbarch_tdep : gdbarch_tdep_base
{
/* Target description. */
const struct target_desc *tdesc = nullptr;
/* ABI version. */
enum s390_abi_kind abi {};
/* Vector ABI. */
enum s390_vector_abi_kind vector_abi {};
/* Pseudo register numbers. */
int gpr_full_regnum = 0;
int pc_regnum = 0;
int cc_regnum = 0;
int v0_full_regnum = 0;
bool have_upper = 0;
bool have_linux_v1 = 0;
bool have_linux_v2 = 0;
bool have_tdb = 0;
bool have_vx = 0;
bool have_gs = 0;
/* Hook to record OS specific systemcall. */
int (*s390_syscall_record) (struct regcache *regcache, LONGEST svc_number)
= nullptr;
};
using s390_gdbarch_tdep_up = std::unique_ptr<s390_gdbarch_tdep>;
/* Decoding S/390 instructions. */
/* Named opcode values for the S/390 instructions we recognize. Some
instructions have their opcode split across two fields; those are the
op1_* and op2_* enums. */
enum
{
op1_lhi = 0xa7, op2_lhi = 0x08,
op1_lghi = 0xa7, op2_lghi = 0x09,
op1_lgfi = 0xc0, op2_lgfi = 0x01,
op_lr = 0x18,
op_lgr = 0xb904,
op_l = 0x58,
op1_ly = 0xe3, op2_ly = 0x58,
op1_lg = 0xe3, op2_lg = 0x04,
op_lm = 0x98,
op1_lmy = 0xeb, op2_lmy = 0x98,
op1_lmg = 0xeb, op2_lmg = 0x04,
op_st = 0x50,
op1_sty = 0xe3, op2_sty = 0x50,
op1_stg = 0xe3, op2_stg = 0x24,
op_std = 0x60,
op_stm = 0x90,
op1_stmy = 0xeb, op2_stmy = 0x90,
op1_stmg = 0xeb, op2_stmg = 0x24,
op1_aghi = 0xa7, op2_aghi = 0x0b,
op1_ahi = 0xa7, op2_ahi = 0x0a,
op1_agfi = 0xc2, op2_agfi = 0x08,
op1_afi = 0xc2, op2_afi = 0x09,
op1_algfi= 0xc2, op2_algfi= 0x0a,
op1_alfi = 0xc2, op2_alfi = 0x0b,
op_ar = 0x1a,
op_agr = 0xb908,
op_a = 0x5a,
op1_ay = 0xe3, op2_ay = 0x5a,
op1_ag = 0xe3, op2_ag = 0x08,
op1_slgfi= 0xc2, op2_slgfi= 0x04,
op1_slfi = 0xc2, op2_slfi = 0x05,
op_sr = 0x1b,
op_sgr = 0xb909,
op_s = 0x5b,
op1_sy = 0xe3, op2_sy = 0x5b,
op1_sg = 0xe3, op2_sg = 0x09,
op_nr = 0x14,
op_ngr = 0xb980,
op_la = 0x41,
op1_lay = 0xe3, op2_lay = 0x71,
op1_larl = 0xc0, op2_larl = 0x00,
op_basr = 0x0d,
op_bas = 0x4d,
op_bcr = 0x07,
op_bc = 0x47,
op_bctr = 0x06,
op_bctgr = 0xb946,
op_bct = 0x46,
op1_bctg = 0xe3, op2_bctg = 0x46,
op_bxh = 0x86,
op1_bxhg = 0xeb, op2_bxhg = 0x44,
op_bxle = 0x87,
op1_bxleg= 0xeb, op2_bxleg= 0x45,
op1_bras = 0xa7, op2_bras = 0x05,
op1_brasl= 0xc0, op2_brasl= 0x05,
op1_brc = 0xa7, op2_brc = 0x04,
op1_brcl = 0xc0, op2_brcl = 0x04,
op1_brct = 0xa7, op2_brct = 0x06,
op1_brctg= 0xa7, op2_brctg= 0x07,
op_brxh = 0x84,
op1_brxhg= 0xec, op2_brxhg= 0x44,
op_brxle = 0x85,
op1_brxlg= 0xec, op2_brxlg= 0x45,
op_svc = 0x0a,
};
/* Hardware capabilities. */
#ifndef HWCAP_S390_HIGH_GPRS
#define HWCAP_S390_HIGH_GPRS 512
#endif
#ifndef HWCAP_S390_TE
#define HWCAP_S390_TE 1024
#endif
#ifndef HWCAP_S390_VX
#define HWCAP_S390_VX 2048
#endif
#ifndef HWCAP_S390_GS
#define HWCAP_S390_GS 16384
#endif
/* Register information. */
/* Program Status Word. */
#define S390_PSWM_REGNUM 0
#define S390_PSWA_REGNUM 1
/* General Purpose Registers. */
#define S390_R0_REGNUM 2
#define S390_R1_REGNUM 3
#define S390_R2_REGNUM 4
#define S390_R3_REGNUM 5
#define S390_R4_REGNUM 6
#define S390_R5_REGNUM 7
#define S390_R6_REGNUM 8
#define S390_R7_REGNUM 9
#define S390_R8_REGNUM 10
#define S390_R9_REGNUM 11
#define S390_R10_REGNUM 12
#define S390_R11_REGNUM 13
#define S390_R12_REGNUM 14
#define S390_R13_REGNUM 15
#define S390_R14_REGNUM 16
#define S390_R15_REGNUM 17
/* Access Registers. */
#define S390_A0_REGNUM 18
#define S390_A1_REGNUM 19
#define S390_A2_REGNUM 20
#define S390_A3_REGNUM 21
#define S390_A4_REGNUM 22
#define S390_A5_REGNUM 23
#define S390_A6_REGNUM 24
#define S390_A7_REGNUM 25
#define S390_A8_REGNUM 26
#define S390_A9_REGNUM 27
#define S390_A10_REGNUM 28
#define S390_A11_REGNUM 29
#define S390_A12_REGNUM 30
#define S390_A13_REGNUM 31
#define S390_A14_REGNUM 32
#define S390_A15_REGNUM 33
/* Floating Point Control Word. */
#define S390_FPC_REGNUM 34
/* Floating Point Registers. */
#define S390_F0_REGNUM 35
#define S390_F1_REGNUM 36
#define S390_F2_REGNUM 37
#define S390_F3_REGNUM 38
#define S390_F4_REGNUM 39
#define S390_F5_REGNUM 40
#define S390_F6_REGNUM 41
#define S390_F7_REGNUM 42
#define S390_F8_REGNUM 43
#define S390_F9_REGNUM 44
#define S390_F10_REGNUM 45
#define S390_F11_REGNUM 46
#define S390_F12_REGNUM 47
#define S390_F13_REGNUM 48
#define S390_F14_REGNUM 49
#define S390_F15_REGNUM 50
/* General Purpose Register Upper Halves. */
#define S390_R0_UPPER_REGNUM 51
#define S390_R1_UPPER_REGNUM 52
#define S390_R2_UPPER_REGNUM 53
#define S390_R3_UPPER_REGNUM 54
#define S390_R4_UPPER_REGNUM 55
#define S390_R5_UPPER_REGNUM 56
#define S390_R6_UPPER_REGNUM 57
#define S390_R7_UPPER_REGNUM 58
#define S390_R8_UPPER_REGNUM 59
#define S390_R9_UPPER_REGNUM 60
#define S390_R10_UPPER_REGNUM 61
#define S390_R11_UPPER_REGNUM 62
#define S390_R12_UPPER_REGNUM 63
#define S390_R13_UPPER_REGNUM 64
#define S390_R14_UPPER_REGNUM 65
#define S390_R15_UPPER_REGNUM 66
/* GNU/Linux-specific optional registers. */
#define S390_ORIG_R2_REGNUM 67
#define S390_LAST_BREAK_REGNUM 68
#define S390_SYSTEM_CALL_REGNUM 69
/* Transaction diagnostic block. */
#define S390_TDB_DWORD0_REGNUM 70
#define S390_TDB_ABORT_CODE_REGNUM 71
#define S390_TDB_CONFLICT_TOKEN_REGNUM 72
#define S390_TDB_ATIA_REGNUM 73
#define S390_TDB_R0_REGNUM 74
#define S390_TDB_R1_REGNUM 75
#define S390_TDB_R2_REGNUM 76
#define S390_TDB_R3_REGNUM 77
#define S390_TDB_R4_REGNUM 78
#define S390_TDB_R5_REGNUM 79
#define S390_TDB_R6_REGNUM 80
#define S390_TDB_R7_REGNUM 81
#define S390_TDB_R8_REGNUM 82
#define S390_TDB_R9_REGNUM 83
#define S390_TDB_R10_REGNUM 84
#define S390_TDB_R11_REGNUM 85
#define S390_TDB_R12_REGNUM 86
#define S390_TDB_R13_REGNUM 87
#define S390_TDB_R14_REGNUM 88
#define S390_TDB_R15_REGNUM 89
/* Vector registers. */
#define S390_V0_LOWER_REGNUM 90
#define S390_V1_LOWER_REGNUM 91
#define S390_V2_LOWER_REGNUM 92
#define S390_V3_LOWER_REGNUM 93
#define S390_V4_LOWER_REGNUM 94
#define S390_V5_LOWER_REGNUM 95
#define S390_V6_LOWER_REGNUM 96
#define S390_V7_LOWER_REGNUM 97
#define S390_V8_LOWER_REGNUM 98
#define S390_V9_LOWER_REGNUM 99
#define S390_V10_LOWER_REGNUM 100
#define S390_V11_LOWER_REGNUM 101
#define S390_V12_LOWER_REGNUM 102
#define S390_V13_LOWER_REGNUM 103
#define S390_V14_LOWER_REGNUM 104
#define S390_V15_LOWER_REGNUM 105
#define S390_V16_REGNUM 106
#define S390_V17_REGNUM 107
#define S390_V18_REGNUM 108
#define S390_V19_REGNUM 109
#define S390_V20_REGNUM 110
#define S390_V21_REGNUM 111
#define S390_V22_REGNUM 112
#define S390_V23_REGNUM 113
#define S390_V24_REGNUM 114
#define S390_V25_REGNUM 115
#define S390_V26_REGNUM 116
#define S390_V27_REGNUM 117
#define S390_V28_REGNUM 118
#define S390_V29_REGNUM 119
#define S390_V30_REGNUM 120
#define S390_V31_REGNUM 121
#define S390_GSD_REGNUM 122
#define S390_GSSM_REGNUM 123
#define S390_GSEPLA_REGNUM 124
#define S390_BC_GSD_REGNUM 125
#define S390_BC_GSSM_REGNUM 126
#define S390_BC_GSEPLA_REGNUM 127
/* Total. */
#define S390_NUM_REGS 128
#define S390_NUM_GPRS 16
#define S390_NUM_FPRS 16
#define S390_MAX_INSTR_SIZE 6
/* Special register usage. */
#define S390_SP_REGNUM S390_R15_REGNUM
#define S390_RETADDR_REGNUM S390_R14_REGNUM
#define S390_FRAME_REGNUM S390_R11_REGNUM
/* Frame unwinding. */
extern struct value *s390_trad_frame_prev_register
(const frame_info_ptr &this_frame, struct trad_frame_saved_reg saved_regs[],
int regnum);
extern const struct target_desc *tdesc_s390_linux32;
extern const struct target_desc *tdesc_s390x_linux64;
#endif /* S390_TDEP_H */
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