diff options
Diffstat (limited to 'gdb/gdbserver/linux-x86-tdesc.c')
| -rw-r--r-- | gdb/gdbserver/linux-x86-tdesc.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/gdb/gdbserver/linux-x86-tdesc.c b/gdb/gdbserver/linux-x86-tdesc.c new file mode 100644 index 0000000..d27068c --- /dev/null +++ b/gdb/gdbserver/linux-x86-tdesc.c @@ -0,0 +1,173 @@ +/* GNU/Linux/x86-64 specific target description, for the remote server + for GDB. + Copyright (C) 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 "tdesc.h" +#include "linux-x86-tdesc.h" +#include "arch/i386.h" +#include "common/x86-xstate.h" +#ifdef __x86_64__ +#include "arch/amd64.h" +#endif + +/* Return the right x86_linux_tdesc index for a given XCR0. Return + X86_TDESC_LAST if can't find a match. */ + +static enum x86_linux_tdesc +xcr0_to_tdesc_idx (uint64_t xcr0, bool is_x32) +{ + if (xcr0 & X86_XSTATE_PKRU) + { + if (is_x32) + { + /* No x32 MPX and PKU, fall back to avx_avx512. */ + return X86_TDESC_AVX_AVX512; + } + else + return X86_TDESC_AVX_MPX_AVX512_PKU; + } + else if (xcr0 & X86_XSTATE_AVX512) + return X86_TDESC_AVX_AVX512; + else if ((xcr0 & X86_XSTATE_AVX_MPX_MASK) == X86_XSTATE_AVX_MPX_MASK) + { + if (is_x32) /* No MPX on x32. */ + return X86_TDESC_AVX; + else + return X86_TDESC_AVX_MPX; + } + else if (xcr0 & X86_XSTATE_MPX) + { + if (is_x32) /* No MPX on x32. */ + return X86_TDESC_AVX; + else + return X86_TDESC_MPX; + } + else if (xcr0 & X86_XSTATE_AVX) + return X86_TDESC_AVX; + else if (xcr0 & X86_XSTATE_SSE) + return X86_TDESC_SSE; + else if (xcr0 & X86_XSTATE_X87) + return X86_TDESC_MMX; + else + return X86_TDESC_LAST; +} + +static struct target_desc *i386_tdescs[X86_TDESC_LAST] = { }; + +#if defined __i386__ || !defined IN_PROCESS_AGENT + +/* Return the target description according to XCR0. */ + +const struct target_desc * +i386_linux_read_description (uint64_t xcr0) +{ + enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, false); + + if (idx == X86_TDESC_LAST) + return NULL; + + struct target_desc **tdesc = &i386_tdescs[idx]; + + if (*tdesc == NULL) + { + *tdesc = i386_create_target_description (xcr0, true); + + init_target_desc (*tdesc); + +#ifndef IN_PROCESS_AGENT + static const char *expedite_regs_i386[] = { "ebp", "esp", "eip", NULL }; + (*tdesc)->expedite_regs = expedite_regs_i386; +#endif + } + + return *tdesc;; +} +#endif + +#ifdef __x86_64__ + +static target_desc *amd64_tdescs[X86_TDESC_LAST] = { }; +static target_desc *x32_tdescs[X86_TDESC_LAST] = { }; + +const struct target_desc * +amd64_linux_read_description (uint64_t xcr0, bool is_x32) +{ + enum x86_linux_tdesc idx = xcr0_to_tdesc_idx (xcr0, is_x32); + + if (idx == X86_TDESC_LAST) + return NULL; + + struct target_desc **tdesc = NULL; + + if (is_x32) + tdesc = &x32_tdescs[idx]; + else + tdesc = &amd64_tdescs[idx]; + + if (*tdesc == NULL) + { + *tdesc = amd64_create_target_description (xcr0, is_x32, true); + + init_target_desc (*tdesc); + +#ifndef IN_PROCESS_AGENT + static const char *expedite_regs_amd64[] = { "rbp", "rsp", "rip", NULL }; + (*tdesc)->expedite_regs = expedite_regs_amd64; +#endif + } + return *tdesc; +} + +#endif + +#ifndef IN_PROCESS_AGENT + +int +i386_get_ipa_tdesc_idx (const struct target_desc *tdesc) +{ + for (int i = 0; i < X86_TDESC_LAST; i++) + { + if (tdesc == i386_tdescs[i]) + return i; + } + + /* If none tdesc is found, return the one with minimum features. */ + return X86_TDESC_MMX; +} + +#if defined __x86_64__ +int +amd64_get_ipa_tdesc_idx (const struct target_desc *tdesc) +{ + for (int i = 0; i < X86_TDESC_LAST; i++) + { + if (tdesc == amd64_tdescs[i]) + return i; + } + for (int i = 0; i < X86_TDESC_LAST; i++) + { + if (tdesc == x32_tdescs[i]) + return i; + } + + return X86_TDESC_SSE; +} + +#endif +#endif |