/* Target-dependent code for GNU/Linux x86. Copyright (C) 2002-2020 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 I386_LINUX_TDEP_H #define I386_LINUX_TDEP_H /* The Linux kernel pretends there is an additional "orig_eax" register. Since GDB needs access to that register to be able to properly restart system calls when necessary (see i386-linux-tdep.c) we need our own versions of a number of functions that deal with GDB's register cache. */ /* Register number for the "orig_eax" pseudo-register. If this pseudo-register contains a value >= 0 it is interpreted as the system call number that the kernel is supposed to restart. */ #define I386_LINUX_ORIG_EAX_REGNUM (I386_PKRU_REGNUM + 1) /* Total number of registers for GNU/Linux. */ #define I386_LINUX_NUM_REGS (I386_LINUX_ORIG_EAX_REGNUM + 1) /* Get XSAVE extended state xcr0 from core dump. */ extern uint64_t i386_linux_core_read_xcr0 (bfd *abfd); /* Handle and display information related to the MPX bound violation to the user. */ extern void i386_linux_report_signal_info (struct gdbarch *gdbarch, struct ui_out *uiout, enum gdb_signal siggnal); /* Return the target description according to XCR0. */ extern const struct target_desc *i386_linux_read_description (uint64_t xcr0); /* Format of XSAVE extended state is: struct { fxsave_bytes[0..463] sw_usable_bytes[464..511] xstate_hdr_bytes[512..575] avx_bytes[576..831] mpx_bytes [960..1032] avx512_k_regs[1088..1152] avx512_zmmh_regs0-7[1153..1407] avx512_zmmh_regs8-15[1408..1663] avx512_zmm_regs16-31[1664..2687] pkru[2688..2752] future_state etc }; Same memory layout will be used for the coredump NT_X86_XSTATE representing the XSAVE extended state registers. The first 8 bytes of the sw_usable_bytes[464..467] is the OS enabled extended state mask, which is the same as the extended control register 0 (the XFEATURE_ENABLED_MASK register), XCR0. We can use this mask together with the mask saved in the xstate_hdr_bytes to determine what states the processor/OS supports and what state, used or initialized, the process/thread is in. */ #define I386_LINUX_XSAVE_XCR0_OFFSET 464 extern int i386_linux_gregset_reg_offset[]; /* Return x86 siginfo type. */ extern struct type *x86_linux_get_siginfo_type (struct gdbarch *gdbarch); #endif /* i386-linux-tdep.h */ |