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55271bf969
The floating point context structure on x86 LynxOS-178 is not
the same as on LynxOS 5.x. As a consequence, trying to print
the return value of a function returning a float, for instance,
yields incorrect results.
This patch fixes the issue by providing an updated definition
for LynxOS-178 (the reason why we cannot access the actual definition
provided by the system still remains true).
gdb/gdbserver/ChangeLog:
* lynx-i386-low.c (LYNXOS_178): New macro.
[LYNXOS_178] (usr_fcontext_t): Provide a definition that matches
the layout on LynxOS-178.
(lynx_i386_fill_fpregset, lynx_i386_store_fpregset): Do not
handle floating point registers that are not supported by
LynxOS-178.
359 lines
12 KiB
C
359 lines
12 KiB
C
/* Copyright (C) 2010-2018 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 "lynx-low.h"
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#include <limits.h>
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#include <sys/ptrace.h>
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#include "x86-xstate.h"
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#include "arch/i386.h"
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#include "x86-tdesc.h"
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/* The following two typedefs are defined in a .h file which is not
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in the standard include path (/sys/include/family/x86/ucontext.h),
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so we just duplicate them here.
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Unfortunately for us, the definition of this structure differs between
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LynxOS 5.x and LynxOS 178. Rather than duplicate the code, we use
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different definitions depending on the target. */
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#ifdef VMOS_DEV
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#define LYNXOS_178
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#endif
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/* General register context */
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typedef struct usr_econtext {
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uint32_t uec_fault;
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uint32_t uec_es;
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uint32_t uec_ds;
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uint32_t uec_edi;
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uint32_t uec_esi;
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uint32_t uec_ebp;
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uint32_t uec_temp;
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uint32_t uec_ebx;
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uint32_t uec_edx;
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uint32_t uec_ecx;
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uint32_t uec_eax;
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uint32_t uec_inum;
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uint32_t uec_ecode;
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uint32_t uec_eip;
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uint32_t uec_cs;
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uint32_t uec_eflags;
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uint32_t uec_esp;
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uint32_t uec_ss;
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uint32_t uec_fs;
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uint32_t uec_gs;
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} usr_econtext_t;
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#if defined(LYNXOS_178)
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/* Floating point register context */
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typedef struct usr_fcontext {
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uint32_t ufc_control;
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uint32_t ufc_status;
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uint32_t ufc_tag;
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uint8_t *ufc_inst_off;
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uint32_t ufc_inst_sel;
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uint8_t *ufc_data_off;
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uint32_t ufc_data_sel;
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struct ufp387_real {
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uint16_t umant4;
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uint16_t umant3;
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uint16_t umant2;
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uint16_t umant1;
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uint16_t us_and_e;
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} ufc_reg[8];
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} usr_fcontext_t;
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#else /* This is LynxOS 5.x. */
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/* Floating point and SIMD register context */
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typedef struct usr_fcontext {
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uint16_t ufc_control;
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uint16_t ufc_status;
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uint16_t ufc_tag;
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uint16_t ufc_opcode;
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uint8_t *ufc_inst_off;
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uint32_t ufc_inst_sel;
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uint8_t *ufc_data_off;
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uint32_t ufc_data_sel;
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uint32_t usse_mxcsr;
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uint32_t usse_mxcsr_mask;
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struct ufp387_real {
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uint16_t umant4;
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uint16_t umant3;
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uint16_t umant2;
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uint16_t umant1;
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uint16_t us_and_e;
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uint16_t ureserved_1;
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uint16_t ureserved_2;
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uint16_t ureserved_3;
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} ufc_reg[8];
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struct uxmm_register {
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uint16_t uchunk_1;
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uint16_t uchunk_2;
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uint16_t uchunk_3;
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uint16_t uchunk_4;
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uint16_t uchunk_5;
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uint16_t uchunk_6;
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uint16_t uchunk_7;
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uint16_t uchunk_8;
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} uxmm_reg[8];
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char ureserved[16][14];
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} usr_fcontext_t;
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#endif
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/* The index of various registers inside the regcache. */
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enum lynx_i386_gdb_regnum
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{
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I386_EAX_REGNUM,
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I386_ECX_REGNUM,
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I386_EDX_REGNUM,
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I386_EBX_REGNUM,
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I386_ESP_REGNUM,
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I386_EBP_REGNUM,
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I386_ESI_REGNUM,
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I386_EDI_REGNUM,
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I386_EIP_REGNUM,
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I386_EFLAGS_REGNUM,
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I386_CS_REGNUM,
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I386_SS_REGNUM,
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I386_DS_REGNUM,
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I386_ES_REGNUM,
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I386_FS_REGNUM,
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I386_GS_REGNUM,
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I386_ST0_REGNUM,
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I386_FCTRL_REGNUM = I386_ST0_REGNUM + 8,
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I386_FSTAT_REGNUM,
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I386_FTAG_REGNUM,
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I386_FISEG_REGNUM,
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I386_FIOFF_REGNUM,
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I386_FOSEG_REGNUM,
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I386_FOOFF_REGNUM,
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I386_FOP_REGNUM,
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I386_XMM0_REGNUM = 32,
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I386_MXCSR_REGNUM = I386_XMM0_REGNUM + 8,
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I386_SENTINEL_REGUM
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};
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/* The fill_function for the general-purpose register set. */
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static void
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lynx_i386_fill_gregset (struct regcache *regcache, char *buf)
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{
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#define lynx_i386_collect_gp(regnum, fld) \
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collect_register (regcache, regnum, \
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buf + offsetof (usr_econtext_t, uec_##fld))
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lynx_i386_collect_gp (I386_EAX_REGNUM, eax);
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lynx_i386_collect_gp (I386_ECX_REGNUM, ecx);
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lynx_i386_collect_gp (I386_EDX_REGNUM, edx);
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lynx_i386_collect_gp (I386_EBX_REGNUM, ebx);
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lynx_i386_collect_gp (I386_ESP_REGNUM, esp);
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lynx_i386_collect_gp (I386_EBP_REGNUM, ebp);
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lynx_i386_collect_gp (I386_ESI_REGNUM, esi);
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lynx_i386_collect_gp (I386_EDI_REGNUM, edi);
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lynx_i386_collect_gp (I386_EIP_REGNUM, eip);
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lynx_i386_collect_gp (I386_EFLAGS_REGNUM, eflags);
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lynx_i386_collect_gp (I386_CS_REGNUM, cs);
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lynx_i386_collect_gp (I386_SS_REGNUM, ss);
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lynx_i386_collect_gp (I386_DS_REGNUM, ds);
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lynx_i386_collect_gp (I386_ES_REGNUM, es);
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lynx_i386_collect_gp (I386_FS_REGNUM, fs);
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lynx_i386_collect_gp (I386_GS_REGNUM, gs);
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}
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/* The store_function for the general-purpose register set. */
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static void
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lynx_i386_store_gregset (struct regcache *regcache, const char *buf)
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{
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#define lynx_i386_supply_gp(regnum, fld) \
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supply_register (regcache, regnum, \
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buf + offsetof (usr_econtext_t, uec_##fld))
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lynx_i386_supply_gp (I386_EAX_REGNUM, eax);
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lynx_i386_supply_gp (I386_ECX_REGNUM, ecx);
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lynx_i386_supply_gp (I386_EDX_REGNUM, edx);
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lynx_i386_supply_gp (I386_EBX_REGNUM, ebx);
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lynx_i386_supply_gp (I386_ESP_REGNUM, esp);
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lynx_i386_supply_gp (I386_EBP_REGNUM, ebp);
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lynx_i386_supply_gp (I386_ESI_REGNUM, esi);
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lynx_i386_supply_gp (I386_EDI_REGNUM, edi);
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lynx_i386_supply_gp (I386_EIP_REGNUM, eip);
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lynx_i386_supply_gp (I386_EFLAGS_REGNUM, eflags);
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lynx_i386_supply_gp (I386_CS_REGNUM, cs);
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lynx_i386_supply_gp (I386_SS_REGNUM, ss);
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lynx_i386_supply_gp (I386_DS_REGNUM, ds);
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lynx_i386_supply_gp (I386_ES_REGNUM, es);
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lynx_i386_supply_gp (I386_FS_REGNUM, fs);
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lynx_i386_supply_gp (I386_GS_REGNUM, gs);
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}
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/* Extract the first 16 bits of register REGNUM in the REGCACHE,
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and store these 2 bytes at DEST.
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This is useful to collect certain 16bit registers which are known
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by GDBserver as 32bit registers (such as the Control Register
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for instance). */
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static void
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collect_16bit_register (struct regcache *regcache, int regnum, char *dest)
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{
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gdb_byte word[4];
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collect_register (regcache, regnum, word);
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memcpy (dest, word, 2);
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}
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/* The fill_function for the floating-point register set. */
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static void
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lynx_i386_fill_fpregset (struct regcache *regcache, char *buf)
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{
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int i;
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/* Collect %st0 .. %st7. */
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for (i = 0; i < 8; i++)
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collect_register (regcache, I386_ST0_REGNUM + i,
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buf + offsetof (usr_fcontext_t, ufc_reg)
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+ i * sizeof (struct ufp387_real));
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/* Collect the other FPU registers. */
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collect_16bit_register (regcache, I386_FCTRL_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_control));
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collect_16bit_register (regcache, I386_FSTAT_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_status));
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collect_16bit_register (regcache, I386_FTAG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_tag));
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collect_register (regcache, I386_FISEG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_inst_sel));
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collect_register (regcache, I386_FIOFF_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_inst_off));
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collect_register (regcache, I386_FOSEG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_data_sel));
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collect_register (regcache, I386_FOOFF_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_data_off));
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#if !defined(LYNXOS_178)
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collect_16bit_register (regcache, I386_FOP_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_opcode));
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/* Collect the XMM registers. */
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for (i = 0; i < 8; i++)
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collect_register (regcache, I386_XMM0_REGNUM + i,
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buf + offsetof (usr_fcontext_t, uxmm_reg)
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+ i * sizeof (struct uxmm_register));
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collect_register (regcache, I386_MXCSR_REGNUM,
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buf + offsetof (usr_fcontext_t, usse_mxcsr));
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#endif
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}
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/* This is the supply counterpart for collect_16bit_register:
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It extracts a 2byte value from BUF, and uses that value to
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set REGNUM's value in the regcache.
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This is useful to supply the value of certain 16bit registers
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which are known by GDBserver as 32bit registers (such as the Control
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Register for instance). */
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static void
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supply_16bit_register (struct regcache *regcache, int regnum, const char *buf)
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{
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gdb_byte word[4];
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memcpy (word, buf, 2);
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memset (word + 2, 0, 2);
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supply_register (regcache, regnum, word);
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}
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/* The store_function for the floating-point register set. */
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static void
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lynx_i386_store_fpregset (struct regcache *regcache, const char *buf)
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{
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int i;
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/* Store the %st0 .. %st7 registers. */
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for (i = 0; i < 8; i++)
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supply_register (regcache, I386_ST0_REGNUM + i,
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buf + offsetof (usr_fcontext_t, ufc_reg)
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+ i * sizeof (struct ufp387_real));
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/* Store the other FPU registers. */
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supply_16bit_register (regcache, I386_FCTRL_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_control));
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supply_16bit_register (regcache, I386_FSTAT_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_status));
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supply_16bit_register (regcache, I386_FTAG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_tag));
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supply_register (regcache, I386_FISEG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_inst_sel));
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supply_register (regcache, I386_FIOFF_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_inst_off));
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supply_register (regcache, I386_FOSEG_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_data_sel));
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supply_register (regcache, I386_FOOFF_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_data_off));
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#if !defined(LYNXOS_178)
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supply_16bit_register (regcache, I386_FOP_REGNUM,
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buf + offsetof (usr_fcontext_t, ufc_opcode));
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/* Store the XMM registers. */
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for (i = 0; i < 8; i++)
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supply_register (regcache, I386_XMM0_REGNUM + i,
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buf + offsetof (usr_fcontext_t, uxmm_reg)
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+ i * sizeof (struct uxmm_register));
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supply_register (regcache, I386_MXCSR_REGNUM,
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buf + offsetof (usr_fcontext_t, usse_mxcsr));
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#endif
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}
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/* Implements the lynx_target_ops.arch_setup routine. */
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static void
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lynx_i386_arch_setup (void)
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{
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struct target_desc *tdesc
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= i386_create_target_description (X86_XSTATE_SSE_MASK, false);
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init_target_desc (tdesc, i386_expedite_regs);
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lynx_tdesc = tdesc;
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}
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/* Description of all the x86-lynx register sets. */
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struct lynx_regset_info lynx_target_regsets[] = {
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/* General Purpose Registers. */
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{PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
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lynx_i386_fill_gregset, lynx_i386_store_gregset},
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/* Floating Point Registers. */
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{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
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lynx_i386_fill_fpregset, lynx_i386_store_fpregset },
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/* End of list marker. */
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{0, 0, -1, NULL, NULL }
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};
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/* The lynx_target_ops vector for x86-lynx. */
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struct lynx_target_ops the_low_target = {
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lynx_i386_arch_setup,
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};
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