| /* GNU/Linux S/390 specific low level interface, for the in-process |
| agent library for GDB. |
| |
| Copyright (C) 2016-2017 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/>. */ |
| |
| #include "server.h" |
| #include <sys/mman.h> |
| #include "tracepoint.h" |
| #include "linux-s390-tdesc.h" |
| #include <elf.h> |
| #ifdef HAVE_GETAUXVAL |
| #include <sys/auxv.h> |
| #endif |
| |
| #define FT_FPR(x) (0x000 + (x) * 0x10) |
| #define FT_VR(x) (0x000 + (x) * 0x10) |
| #define FT_VR_L(x) (0x008 + (x) * 0x10) |
| #define FT_GPR(x) (0x200 + (x) * 8) |
| #define FT_GPR_U(x) (0x200 + (x) * 8) |
| #define FT_GPR_L(x) (0x204 + (x) * 8) |
| #define FT_GPR(x) (0x200 + (x) * 8) |
| #define FT_ACR(x) (0x280 + (x) * 4) |
| #define FT_PSWM 0x2c0 |
| #define FT_PSWM_U 0x2c0 |
| #define FT_PSWA 0x2c8 |
| #define FT_PSWA_L 0x2cc |
| #define FT_FPC 0x2d0 |
| |
| /* Mappings between registers collected by the jump pad and GDB's register |
| array layout used by regcache. |
| |
| See linux-s390-low.c (s390_install_fast_tracepoint_jump_pad) for more |
| details. */ |
| |
| #ifndef __s390x__ |
| |
| /* Used for s390-linux32, s390-linux32v1, s390-linux32v2. */ |
| |
| static const int s390_linux32_ft_collect_regmap[] = { |
| /* 32-bit PSWA and PSWM. */ |
| FT_PSWM_U, FT_PSWA_L, |
| /* 32-bit GPRs (mapped to lower halves of 64-bit slots). */ |
| FT_GPR_L (0), FT_GPR_L (1), FT_GPR_L (2), FT_GPR_L (3), |
| FT_GPR_L (4), FT_GPR_L (5), FT_GPR_L (6), FT_GPR_L (7), |
| FT_GPR_L (8), FT_GPR_L (9), FT_GPR_L (10), FT_GPR_L (11), |
| FT_GPR_L (12), FT_GPR_L (13), FT_GPR_L (14), FT_GPR_L (15), |
| /* ACRs */ |
| FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| /* orig_r2, last_break, system_call */ |
| -1, -1, -1, |
| }; |
| |
| /* Used for s390-linux64, s390-linux64v1, s390-linux64v2, s390-vx-linux64. */ |
| |
| static const int s390_linux64_ft_collect_regmap[] = { |
| /* 32-bit PSWA and PSWM. */ |
| FT_PSWM_U, FT_PSWA_L, |
| /* 32-bit halves of 64-bit GPRs. */ |
| FT_GPR_U (0), FT_GPR_L (0), |
| FT_GPR_U (1), FT_GPR_L (1), |
| FT_GPR_U (2), FT_GPR_L (2), |
| FT_GPR_U (3), FT_GPR_L (3), |
| FT_GPR_U (4), FT_GPR_L (4), |
| FT_GPR_U (5), FT_GPR_L (5), |
| FT_GPR_U (6), FT_GPR_L (6), |
| FT_GPR_U (7), FT_GPR_L (7), |
| FT_GPR_U (8), FT_GPR_L (8), |
| FT_GPR_U (9), FT_GPR_L (9), |
| FT_GPR_U (10), FT_GPR_L (10), |
| FT_GPR_U (11), FT_GPR_L (11), |
| FT_GPR_U (12), FT_GPR_L (12), |
| FT_GPR_U (13), FT_GPR_L (13), |
| FT_GPR_U (14), FT_GPR_L (14), |
| FT_GPR_U (15), FT_GPR_L (15), |
| /* ACRs */ |
| FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| /* orig_r2, last_break, system_call */ |
| -1, -1, -1, |
| /* Lower halves of 128-bit VRs. */ |
| FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| /* And the next 16 VRs. */ |
| FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| }; |
| |
| /* Used for s390-te-linux64, s390-tevx-linux64. */ |
| |
| static const int s390_te_linux64_ft_collect_regmap[] = { |
| /* 32-bit PSWA and PSWM. */ |
| FT_PSWM_U, FT_PSWA_L, |
| /* 32-bit halves of 64-bit GPRs. */ |
| FT_GPR_U (0), FT_GPR_L (0), |
| FT_GPR_U (1), FT_GPR_L (1), |
| FT_GPR_U (2), FT_GPR_L (2), |
| FT_GPR_U (3), FT_GPR_L (3), |
| FT_GPR_U (4), FT_GPR_L (4), |
| FT_GPR_U (5), FT_GPR_L (5), |
| FT_GPR_U (6), FT_GPR_L (6), |
| FT_GPR_U (7), FT_GPR_L (7), |
| FT_GPR_U (8), FT_GPR_L (8), |
| FT_GPR_U (9), FT_GPR_L (9), |
| FT_GPR_U (10), FT_GPR_L (10), |
| FT_GPR_U (11), FT_GPR_L (11), |
| FT_GPR_U (12), FT_GPR_L (12), |
| FT_GPR_U (13), FT_GPR_L (13), |
| FT_GPR_U (14), FT_GPR_L (14), |
| FT_GPR_U (15), FT_GPR_L (15), |
| /* ACRs */ |
| FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| /* orig_r2, last_break, system_call */ |
| -1, -1, -1, |
| /* TDB */ |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| /* Lower halves of 128-bit VRs. */ |
| FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| /* And the next 16 VRs. */ |
| FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| }; |
| |
| #else /* __s390x__ */ |
| |
| /* Used for s390x-linux64, s390x-linux64v1, s390x-linux64v2, s390x-vx-linux64. */ |
| |
| static const int s390x_ft_collect_regmap[] = { |
| /* 64-bit PSWA and PSWM. */ |
| FT_PSWM, FT_PSWA, |
| /* 64-bit GPRs. */ |
| FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3), |
| FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7), |
| FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11), |
| FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15), |
| /* ACRs */ |
| FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| /* orig_r2, last_break, system_call */ |
| -1, -1, -1, |
| /* Lower halves of 128-bit VRs. */ |
| FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| /* And the next 16 VRs. */ |
| FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| }; |
| |
| /* Used for s390x-te-linux64, s390x-tevx-linux64. */ |
| |
| static const int s390x_te_ft_collect_regmap[] = { |
| /* 64-bit PSWA and PSWM. */ |
| FT_PSWM, FT_PSWA, |
| /* 64-bit GPRs. */ |
| FT_GPR (0), FT_GPR (1), FT_GPR (2), FT_GPR (3), |
| FT_GPR (4), FT_GPR (5), FT_GPR (6), FT_GPR (7), |
| FT_GPR (8), FT_GPR (9), FT_GPR (10), FT_GPR (11), |
| FT_GPR (12), FT_GPR (13), FT_GPR (14), FT_GPR (15), |
| /* ACRs */ |
| FT_ACR (0), FT_ACR (1), FT_ACR (2), FT_ACR (3), |
| FT_ACR (4), FT_ACR (5), FT_ACR (6), FT_ACR (7), |
| FT_ACR (8), FT_ACR (9), FT_ACR (10), FT_ACR (11), |
| FT_ACR (12), FT_ACR (13), FT_ACR (14), FT_ACR (15), |
| /* FPRs (mapped to upper halves of 128-bit VR slots). */ |
| FT_FPR (0), FT_FPR (1), FT_FPR (2), FT_FPR (3), |
| FT_FPR (4), FT_FPR (5), FT_FPR (6), FT_FPR (7), |
| FT_FPR (8), FT_FPR (9), FT_FPR (10), FT_FPR (11), |
| FT_FPR (12), FT_FPR (13), FT_FPR (14), FT_FPR (15), |
| /* orig_r2, last_break, system_call */ |
| -1, -1, -1, |
| /* TDB */ |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| -1, -1, -1, -1, |
| /* Lower halves of 128-bit VRs. */ |
| FT_VR_L (0), FT_VR_L (1), FT_VR_L (2), FT_VR_L (3), |
| FT_VR_L (4), FT_VR_L (5), FT_VR_L (6), FT_VR_L (7), |
| FT_VR_L (8), FT_VR_L (9), FT_VR_L (10), FT_VR_L (11), |
| FT_VR_L (12), FT_VR_L (13), FT_VR_L (14), FT_VR_L (15), |
| /* And the next 16 VRs. */ |
| FT_VR (16), FT_VR (17), FT_VR (18), FT_VR (19), |
| FT_VR (20), FT_VR (21), FT_VR (22), FT_VR (23), |
| FT_VR (24), FT_VR (25), FT_VR (26), FT_VR (27), |
| FT_VR (28), FT_VR (29), FT_VR (30), FT_VR (31), |
| }; |
| |
| #endif |
| |
| /* Initialized by get_ipa_tdesc according to the tdesc in use. */ |
| |
| static const int *s390_regmap; |
| static int s390_regnum; |
| |
| /* Fill in REGCACHE with registers saved by the jump pad in BUF. */ |
| |
| void |
| supply_fast_tracepoint_registers (struct regcache *regcache, |
| const unsigned char *buf) |
| { |
| int i; |
| for (i = 0; i < s390_regnum; i++) |
| if (s390_regmap[i] != -1) |
| supply_register (regcache, i, ((char *) buf) + s390_regmap[i]); |
| } |
| |
| ULONGEST |
| get_raw_reg (const unsigned char *raw_regs, int regnum) |
| { |
| int offset; |
| if (regnum >= s390_regnum) |
| return 0; |
| offset = s390_regmap[regnum]; |
| if (offset == -1) |
| return 0; |
| |
| /* The regnums are variable, better to figure out size by FT offset. */ |
| |
| /* 64-bit ones. */ |
| if (offset < FT_VR(16) |
| #ifdef __s390x__ |
| || (offset >= FT_GPR(0) && offset < FT_ACR(0)) |
| || offset == FT_PSWM |
| || offset == FT_PSWA |
| #endif |
| ) |
| return *(uint64_t *) (raw_regs + offset); |
| |
| if (offset >= FT_ACR(0 && offset < FT_PSWM) |
| || offset == FT_FPC |
| #ifndef __s390x__ |
| || (offset >= FT_GPR(0) && offset < FT_ACR(0)) |
| || offset == FT_PSWM_U |
| || offset == FT_PSWA_L |
| #endif |
| ) |
| return *(uint32_t *) (raw_regs + offset); |
| |
| /* This leaves 128-bit VX. No way to return them. */ |
| return 0; |
| } |
| |
| /* Return target_desc to use for IPA, given the tdesc index passed by |
| gdbserver. For s390, it also sets s390_regmap and s390_regnum. */ |
| |
| const struct target_desc * |
| get_ipa_tdesc (int idx) |
| { |
| #define SET_REGMAP(regmap, skip_last) \ |
| do { \ |
| s390_regmap = regmap; \ |
| s390_regnum = (sizeof regmap / sizeof regmap[0]) - skip_last; \ |
| } while(0) |
| switch (idx) |
| { |
| #ifdef __s390x__ |
| case S390_TDESC_64: |
| /* Subtract number of VX regs. */ |
| SET_REGMAP(s390x_ft_collect_regmap, 32); |
| return tdesc_s390x_linux64; |
| case S390_TDESC_64V1: |
| SET_REGMAP(s390x_ft_collect_regmap, 32); |
| return tdesc_s390x_linux64v1; |
| case S390_TDESC_64V2: |
| SET_REGMAP(s390x_ft_collect_regmap, 32); |
| return tdesc_s390x_linux64v2; |
| case S390_TDESC_TE: |
| SET_REGMAP(s390x_te_ft_collect_regmap, 32); |
| return tdesc_s390x_te_linux64; |
| case S390_TDESC_VX: |
| SET_REGMAP(s390x_ft_collect_regmap, 0); |
| return tdesc_s390x_vx_linux64; |
| case S390_TDESC_TEVX: |
| SET_REGMAP(s390x_te_ft_collect_regmap, 0); |
| return tdesc_s390x_tevx_linux64; |
| #else |
| case S390_TDESC_32: |
| SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| return tdesc_s390_linux32; |
| case S390_TDESC_32V1: |
| SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| return tdesc_s390_linux32v1; |
| case S390_TDESC_32V2: |
| SET_REGMAP(s390_linux32_ft_collect_regmap, 0); |
| 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; |
| #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 (); |
| #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 (); |
| #endif |
| } |
