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464 lines
15 KiB
C++
464 lines
15 KiB
C++
/* GNU/Linux S/390 specific low level interface, for the in-process
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agent library for GDB.
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Copyright (C) 2016-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include <sys/mman.h>
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#include "tracepoint.h"
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#include "linux-s390-tdesc.h"
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#include <elf.h>
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#ifdef HAVE_GETAUXVAL
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#include <sys/auxv.h>
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#endif
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#define FT_FPR(x) (0x000 + (x) * 0x10)
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#define FT_VR(x) (0x000 + (x) * 0x10)
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#define FT_VR_L(x) (0x008 + (x) * 0x10)
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#define FT_GPR(x) (0x200 + (x) * 8)
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#define FT_GPR_U(x) (0x200 + (x) * 8)
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#define FT_GPR_L(x) (0x204 + (x) * 8)
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#define FT_GPR(x) (0x200 + (x) * 8)
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#define FT_ACR(x) (0x280 + (x) * 4)
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#define FT_PSWM 0x2c0
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#define FT_PSWM_U 0x2c0
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#define FT_PSWA 0x2c8
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#define FT_PSWA_L 0x2cc
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#define FT_FPC 0x2d0
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/* Mappings between registers collected by the jump pad and GDB's register
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array layout used by regcache.
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See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more
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details. */
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#ifndef __s390x__
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/* Used for s390-linux32, s390-linux32v1, s390-linux32v2. */
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static const int s390_linux32_ft_collect_regmap[] = {
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/* 32-bit PSWA and PSWM. */
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FT_PSWM_U, FT_PSWA_L,
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/* 32-bit GPRs (mapped to lower halves of 64-bit slots). */
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FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3),
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FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7),
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FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11),
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FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15),
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/* ACRs */
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FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
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FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
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FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
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FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
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/* FPRs (mapped to upper halves of 128-bit VR slots). */
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FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
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FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
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FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
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FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
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/* orig_r2, last_break, system_call */
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-1, -1, -1,
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};
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/* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64. */
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static const int s390_linux64_ft_collect_regmap[] = {
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/* 32-bit PSWA and PSWM. */
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FT_PSWM_U, FT_PSWA_L,
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/* 32-bit halves of 64-bit GPRs. */
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FT_GPR_U (0), FT_GPR_L (0),
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FT_GPR_U (1), FT_GPR_L (1),
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FT_GPR_U (2), FT_GPR_L (2),
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FT_GPR_U (3), FT_GPR_L (3),
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FT_GPR_U (4), FT_GPR_L (4),
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FT_GPR_U (5), FT_GPR_L (5),
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FT_GPR_U (6), FT_GPR_L (6),
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FT_GPR_U (7), FT_GPR_L (7),
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FT_GPR_U (8), FT_GPR_L (8),
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FT_GPR_U (9), FT_GPR_L (9),
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FT_GPR_U (10), FT_GPR_L (10),
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FT_GPR_U (11), FT_GPR_L (11),
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FT_GPR_U (12), FT_GPR_L (12),
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FT_GPR_U (13), FT_GPR_L (13),
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FT_GPR_U (14), FT_GPR_L (14),
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FT_GPR_U (15), FT_GPR_L (15),
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/* ACRs */
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FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
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FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
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FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
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FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
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/* FPRs (mapped to upper halves of 128-bit VR slots). */
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FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
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FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
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FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
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FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
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/* orig_r2, last_break, system_call */
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-1, -1, -1,
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/* Lower halves of 128-bit VRs. */
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FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
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FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
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FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
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FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
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/* And the next 16 VRs. */
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FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
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FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
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FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
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FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
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};
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/* Used for s390-te-linux64, s390-tevx-linux64, and s390-gs-linux64. */
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static const int s390_te_linux64_ft_collect_regmap[] = {
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/* 32-bit PSWA and PSWM. */
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FT_PSWM_U, FT_PSWA_L,
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/* 32-bit halves of 64-bit GPRs. */
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FT_GPR_U (0), FT_GPR_L (0),
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FT_GPR_U (1), FT_GPR_L (1),
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FT_GPR_U (2), FT_GPR_L (2),
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FT_GPR_U (3), FT_GPR_L (3),
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FT_GPR_U (4), FT_GPR_L (4),
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FT_GPR_U (5), FT_GPR_L (5),
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FT_GPR_U (6), FT_GPR_L (6),
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FT_GPR_U (7), FT_GPR_L (7),
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FT_GPR_U (8), FT_GPR_L (8),
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FT_GPR_U (9), FT_GPR_L (9),
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FT_GPR_U (10), FT_GPR_L (10),
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FT_GPR_U (11), FT_GPR_L (11),
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FT_GPR_U (12), FT_GPR_L (12),
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FT_GPR_U (13), FT_GPR_L (13),
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FT_GPR_U (14), FT_GPR_L (14),
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FT_GPR_U (15), FT_GPR_L (15),
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/* ACRs */
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FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
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FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
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FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
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FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
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/* FPRs (mapped to upper halves of 128-bit VR slots). */
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FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
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FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
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FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
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FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
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/* orig_r2, last_break, system_call */
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-1, -1, -1,
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/* TDB */
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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/* Lower halves of 128-bit VRs. */
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FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
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FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
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FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
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FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
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/* And the next 16 VRs. */
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FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
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FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
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FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
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FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
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};
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#else /* __s390x__ */
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/* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64. */
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static const int s390x_ft_collect_regmap[] = {
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/* 64-bit PSWA and PSWM. */
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FT_PSWM, FT_PSWA,
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/* 64-bit GPRs. */
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FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
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FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
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FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
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FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
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/* ACRs */
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FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
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FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
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FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
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FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
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/* FPRs (mapped to upper halves of 128-bit VR slots). */
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FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
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FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
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FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
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FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
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/* orig_r2, last_break, system_call */
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-1, -1, -1,
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/* Lower halves of 128-bit VRs. */
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FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
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FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
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FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
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FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
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/* And the next 16 VRs. */
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FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
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FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
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FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
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FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
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};
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/* Used for s390x-te-linux64, s390x-tevx-linux64, and
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s390x-gs-linux64. */
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static const int s390x_te_ft_collect_regmap[] = {
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/* 64-bit PSWA and PSWM. */
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FT_PSWM, FT_PSWA,
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/* 64-bit GPRs. */
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FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3),
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FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7),
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FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11),
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FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15),
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/* ACRs */
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FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3),
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FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7),
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FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11),
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FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15),
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/* FPRs (mapped to upper halves of 128-bit VR slots). */
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FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3),
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FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7),
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FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11),
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FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15),
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/* orig_r2, last_break, system_call */
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-1, -1, -1,
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/* TDB */
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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-1, -1, -1, -1,
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/* Lower halves of 128-bit VRs. */
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FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3),
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FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7),
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FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11),
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FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15),
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/* And the next 16 VRs. */
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FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19),
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FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23),
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FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27),
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FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31),
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};
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#endif
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/* Initialized by get_ipa_tdesc according to the tdesc in use. */
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static const int *s390_regmap;
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static int s390_regnum;
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/* Fill in REGCACHE with registers saved by the jump pad in BUF. */
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void
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supply_fast_tracepoint_registers (struct regcache *regcache,
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const unsigned char *buf)
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{
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int i;
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for (i = 0; i < s390_regnum; i++)
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if (s390_regmap[i] != -1)
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supply_register (regcache, i, ((char *) buf) + s390_regmap[i]);
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}
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ULONGEST
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get_raw_reg (const unsigned char *raw_regs, int regnum)
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{
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int offset;
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if (regnum >= s390_regnum)
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return 0;
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offset = s390_regmap[regnum];
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if (offset == -1)
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return 0;
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/* The regnums are variable, better to figure out size by FT offset. */
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/* 64-bit ones. */
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if (offset < FT_VR(16)
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#ifdef __s390x__
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|| (offset >= FT_GPR(0) && offset < FT_ACR(0))
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|| offset == FT_PSWM
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|| offset == FT_PSWA
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#endif
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)
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return *(uint64_t *) (raw_regs + offset);
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if (offset >= FT_ACR(0 && offset < FT_PSWM)
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|| offset == FT_FPC
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#ifndef __s390x__
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|| (offset >= FT_GPR(0) && offset < FT_ACR(0))
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|| offset == FT_PSWM_U
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|| offset == FT_PSWA_L
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#endif
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)
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return *(uint32_t *) (raw_regs + offset);
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/* This leaves 128-bit VX. No way to return them. */
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return 0;
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}
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/* Return target_desc to use for IPA, given the tdesc index passed by
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gdbserver. For s390, it also sets s390_regmap and s390_regnum. */
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const struct target_desc *
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get_ipa_tdesc (int idx)
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{
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#define SET_REGMAP(regmap, skip_last) \
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do { \
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s390_regmap = regmap; \
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s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \
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} while(0)
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switch (idx)
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{
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#ifdef __s390x__
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case S390_TDESC_64:
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/* Subtract number of VX regs. */
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SET_REGMAP(s390x_ft_collect_regmap, 32);
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return tdesc_s390x_linux64;
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case S390_TDESC_64V1:
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SET_REGMAP(s390x_ft_collect_regmap, 32);
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return tdesc_s390x_linux64v1;
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case S390_TDESC_64V2:
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SET_REGMAP(s390x_ft_collect_regmap, 32);
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return tdesc_s390x_linux64v2;
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case S390_TDESC_TE:
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SET_REGMAP(s390x_te_ft_collect_regmap, 32);
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return tdesc_s390x_te_linux64;
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case S390_TDESC_VX:
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SET_REGMAP(s390x_ft_collect_regmap, 0);
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return tdesc_s390x_vx_linux64;
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case S390_TDESC_TEVX:
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SET_REGMAP(s390x_te_ft_collect_regmap, 0);
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return tdesc_s390x_tevx_linux64;
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case S390_TDESC_GS:
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SET_REGMAP(s390x_te_ft_collect_regmap, 0);
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return tdesc_s390x_gs_linux64;
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#else
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case S390_TDESC_32:
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SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
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return tdesc_s390_linux32;
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case S390_TDESC_32V1:
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SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
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return tdesc_s390_linux32v1;
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case S390_TDESC_32V2:
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SET_REGMAP(s390_linux32_ft_collect_regmap, 0);
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return tdesc_s390_linux32v2;
|
|
case S390_TDESC_64:
|
|
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
|
|
return tdesc_s390_linux64;
|
|
case S390_TDESC_64V1:
|
|
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
|
|
return tdesc_s390_linux64v1;
|
|
case S390_TDESC_64V2:
|
|
SET_REGMAP(s390_linux64_ft_collect_regmap, 32);
|
|
return tdesc_s390_linux64v2;
|
|
case S390_TDESC_TE:
|
|
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 32);
|
|
return tdesc_s390_te_linux64;
|
|
case S390_TDESC_VX:
|
|
SET_REGMAP(s390_linux64_ft_collect_regmap, 0);
|
|
return tdesc_s390_vx_linux64;
|
|
case S390_TDESC_TEVX:
|
|
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
|
|
return tdesc_s390_tevx_linux64;
|
|
case S390_TDESC_GS:
|
|
SET_REGMAP(s390_te_linux64_ft_collect_regmap, 0);
|
|
return tdesc_s390_gs_linux64;
|
|
#endif
|
|
default:
|
|
internal_error (__FILE__, __LINE__,
|
|
"unknown ipa tdesc index: %d", idx);
|
|
#ifdef __s390x__
|
|
return tdesc_s390x_linux64;
|
|
#else
|
|
return tdesc_s390_linux32;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* Allocate buffer for the jump pads. On 31-bit, JG reaches everywhere,
|
|
so just allocate normally. On 64-bit, we have +/-4GiB of reach, and
|
|
the executable is usually mapped at 0x80000000 - aim for somewhere
|
|
below it. */
|
|
|
|
void *
|
|
alloc_jump_pad_buffer (size_t size)
|
|
{
|
|
#ifdef __s390x__
|
|
uintptr_t addr;
|
|
uintptr_t exec_base = getauxval (AT_PHDR);
|
|
int pagesize;
|
|
void *res;
|
|
|
|
if (exec_base == 0)
|
|
exec_base = 0x80000000;
|
|
|
|
pagesize = sysconf (_SC_PAGE_SIZE);
|
|
if (pagesize == -1)
|
|
perror_with_name ("sysconf");
|
|
|
|
addr = exec_base - size;
|
|
|
|
/* size should already be page-aligned, but this can't hurt. */
|
|
addr &= ~(pagesize - 1);
|
|
|
|
/* Search for a free area. If we hit 0, we're out of luck. */
|
|
for (; addr; addr -= pagesize)
|
|
{
|
|
/* No MAP_FIXED - we don't want to zap someone's mapping. */
|
|
res = mmap ((void *) addr, size,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
|
|
/* If we got what we wanted, return. */
|
|
if ((uintptr_t) res == addr)
|
|
return res;
|
|
|
|
/* If we got a mapping, but at a wrong address, undo it. */
|
|
if (res != MAP_FAILED)
|
|
munmap (res, size);
|
|
}
|
|
|
|
return NULL;
|
|
#else
|
|
void *res = mmap (NULL, size, PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|
|
|
if (res == MAP_FAILED)
|
|
return NULL;
|
|
|
|
return res;
|
|
#endif
|
|
}
|
|
|
|
void
|
|
initialize_low_tracepoint (void)
|
|
{
|
|
#ifdef __s390x__
|
|
init_registers_s390x_linux64 ();
|
|
init_registers_s390x_linux64v1 ();
|
|
init_registers_s390x_linux64v2 ();
|
|
init_registers_s390x_te_linux64 ();
|
|
init_registers_s390x_vx_linux64 ();
|
|
init_registers_s390x_tevx_linux64 ();
|
|
init_registers_s390x_gs_linux64 ();
|
|
#else
|
|
init_registers_s390_linux32 ();
|
|
init_registers_s390_linux32v1 ();
|
|
init_registers_s390_linux32v2 ();
|
|
init_registers_s390_linux64 ();
|
|
init_registers_s390_linux64v1 ();
|
|
init_registers_s390_linux64v2 ();
|
|
init_registers_s390_te_linux64 ();
|
|
init_registers_s390_vx_linux64 ();
|
|
init_registers_s390_tevx_linux64 ();
|
|
init_registers_s390_gs_linux64 ();
|
|
#endif
|
|
}
|