a0fc1436f1
The result of the s32ex opcode is recorded in the ATOMCTL special
register and must be retrieved with the getex opcode. Context switch
between s32ex and getex may trash the ATOMCTL register and result in
duplicate update or missing update of the atomic variable.
Add atomctl8 field to the struct thread_info and use getex to swap
ATOMCTL bit 8 as a part of context switch.
Clear exclusive access monitor on kernel entry.
Cc: stable@vger.kernel.org
Fixes: f7c34874f0 ("xtensa: add exclusive atomics support")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
150 lines
6.1 KiB
C
150 lines
6.1 KiB
C
/*
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* arch/xtensa/kernel/asm-offsets.c
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*
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* Generates definitions from c-type structures used by assembly sources.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2005 Tensilica Inc.
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*
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* Chris Zankel <chris@zankel.net>
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*/
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#include <asm/processor.h>
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#include <asm/coprocessor.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/thread_info.h>
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#include <linux/ptrace.h>
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#include <linux/mm.h>
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#include <linux/kbuild.h>
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#include <asm/ptrace.h>
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#include <asm/traps.h>
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#include <linux/uaccess.h>
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int main(void)
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{
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/* struct pt_regs */
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DEFINE(PT_PC, offsetof (struct pt_regs, pc));
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DEFINE(PT_PS, offsetof (struct pt_regs, ps));
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DEFINE(PT_DEPC, offsetof (struct pt_regs, depc));
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DEFINE(PT_EXCCAUSE, offsetof (struct pt_regs, exccause));
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DEFINE(PT_EXCVADDR, offsetof (struct pt_regs, excvaddr));
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DEFINE(PT_DEBUGCAUSE, offsetof (struct pt_regs, debugcause));
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DEFINE(PT_WMASK, offsetof (struct pt_regs, wmask));
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DEFINE(PT_LBEG, offsetof (struct pt_regs, lbeg));
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DEFINE(PT_LEND, offsetof (struct pt_regs, lend));
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DEFINE(PT_LCOUNT, offsetof (struct pt_regs, lcount));
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DEFINE(PT_SAR, offsetof (struct pt_regs, sar));
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DEFINE(PT_ICOUNTLEVEL, offsetof (struct pt_regs, icountlevel));
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DEFINE(PT_SYSCALL, offsetof (struct pt_regs, syscall));
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DEFINE(PT_SCOMPARE1, offsetof(struct pt_regs, scompare1));
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DEFINE(PT_THREADPTR, offsetof(struct pt_regs, threadptr));
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DEFINE(PT_AREG, offsetof (struct pt_regs, areg[0]));
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DEFINE(PT_AREG0, offsetof (struct pt_regs, areg[0]));
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DEFINE(PT_AREG1, offsetof (struct pt_regs, areg[1]));
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DEFINE(PT_AREG2, offsetof (struct pt_regs, areg[2]));
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DEFINE(PT_AREG3, offsetof (struct pt_regs, areg[3]));
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DEFINE(PT_AREG4, offsetof (struct pt_regs, areg[4]));
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DEFINE(PT_AREG5, offsetof (struct pt_regs, areg[5]));
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DEFINE(PT_AREG6, offsetof (struct pt_regs, areg[6]));
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DEFINE(PT_AREG7, offsetof (struct pt_regs, areg[7]));
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DEFINE(PT_AREG8, offsetof (struct pt_regs, areg[8]));
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DEFINE(PT_AREG9, offsetof (struct pt_regs, areg[9]));
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DEFINE(PT_AREG10, offsetof (struct pt_regs, areg[10]));
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DEFINE(PT_AREG11, offsetof (struct pt_regs, areg[11]));
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DEFINE(PT_AREG12, offsetof (struct pt_regs, areg[12]));
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DEFINE(PT_AREG13, offsetof (struct pt_regs, areg[13]));
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DEFINE(PT_AREG14, offsetof (struct pt_regs, areg[14]));
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DEFINE(PT_AREG15, offsetof (struct pt_regs, areg[15]));
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DEFINE(PT_WINDOWBASE, offsetof (struct pt_regs, windowbase));
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DEFINE(PT_WINDOWSTART, offsetof(struct pt_regs, windowstart));
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DEFINE(PT_SIZE, sizeof(struct pt_regs));
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DEFINE(PT_AREG_END, offsetof (struct pt_regs, areg[XCHAL_NUM_AREGS]));
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DEFINE(PT_USER_SIZE, offsetof(struct pt_regs, areg[XCHAL_NUM_AREGS]));
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DEFINE(PT_XTREGS_OPT, offsetof(struct pt_regs, xtregs_opt));
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DEFINE(XTREGS_OPT_SIZE, sizeof(xtregs_opt_t));
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/* struct task_struct */
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DEFINE(TASK_PTRACE, offsetof (struct task_struct, ptrace));
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DEFINE(TASK_MM, offsetof (struct task_struct, mm));
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DEFINE(TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
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DEFINE(TASK_PID, offsetof (struct task_struct, pid));
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DEFINE(TASK_THREAD, offsetof (struct task_struct, thread));
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DEFINE(TASK_THREAD_INFO, offsetof (struct task_struct, stack));
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#ifdef CONFIG_STACKPROTECTOR
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DEFINE(TASK_STACK_CANARY, offsetof(struct task_struct, stack_canary));
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#endif
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DEFINE(TASK_STRUCT_SIZE, sizeof (struct task_struct));
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/* offsets in thread_info struct */
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OFFSET(TI_TASK, thread_info, task);
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OFFSET(TI_FLAGS, thread_info, flags);
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OFFSET(TI_STSTUS, thread_info, status);
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OFFSET(TI_CPU, thread_info, cpu);
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OFFSET(TI_PRE_COUNT, thread_info, preempt_count);
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OFFSET(TI_ADDR_LIMIT, thread_info, addr_limit);
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/* struct thread_info (offset from start_struct) */
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DEFINE(THREAD_RA, offsetof (struct task_struct, thread.ra));
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DEFINE(THREAD_SP, offsetof (struct task_struct, thread.sp));
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DEFINE(THREAD_CPENABLE, offsetof (struct thread_info, cpenable));
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#if XCHAL_HAVE_EXCLUSIVE
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DEFINE(THREAD_ATOMCTL8, offsetof (struct thread_info, atomctl8));
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#endif
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#if XTENSA_HAVE_COPROCESSORS
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DEFINE(THREAD_XTREGS_CP0, offsetof(struct thread_info, xtregs_cp.cp0));
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DEFINE(THREAD_XTREGS_CP1, offsetof(struct thread_info, xtregs_cp.cp1));
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DEFINE(THREAD_XTREGS_CP2, offsetof(struct thread_info, xtregs_cp.cp2));
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DEFINE(THREAD_XTREGS_CP3, offsetof(struct thread_info, xtregs_cp.cp3));
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DEFINE(THREAD_XTREGS_CP4, offsetof(struct thread_info, xtregs_cp.cp4));
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DEFINE(THREAD_XTREGS_CP5, offsetof(struct thread_info, xtregs_cp.cp5));
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DEFINE(THREAD_XTREGS_CP6, offsetof(struct thread_info, xtregs_cp.cp6));
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DEFINE(THREAD_XTREGS_CP7, offsetof(struct thread_info, xtregs_cp.cp7));
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#endif
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DEFINE(THREAD_XTREGS_USER, offsetof (struct thread_info, xtregs_user));
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DEFINE(XTREGS_USER_SIZE, sizeof(xtregs_user_t));
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DEFINE(THREAD_CURRENT_DS, offsetof (struct task_struct, \
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thread.current_ds));
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/* struct mm_struct */
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DEFINE(MM_USERS, offsetof(struct mm_struct, mm_users));
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DEFINE(MM_PGD, offsetof (struct mm_struct, pgd));
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DEFINE(MM_CONTEXT, offsetof (struct mm_struct, context));
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/* struct page */
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DEFINE(PAGE_FLAGS, offsetof(struct page, flags));
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/* constants */
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DEFINE(_CLONE_VM, CLONE_VM);
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DEFINE(_CLONE_UNTRACED, CLONE_UNTRACED);
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DEFINE(PG_ARCH_1, PG_arch_1);
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/* struct debug_table */
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DEFINE(DT_DEBUG_EXCEPTION,
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offsetof(struct debug_table, debug_exception));
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DEFINE(DT_DEBUG_SAVE, offsetof(struct debug_table, debug_save));
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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DEFINE(DT_DBREAKC_SAVE, offsetof(struct debug_table, dbreakc_save));
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DEFINE(DT_ICOUNT_SAVE, offsetof(struct debug_table, icount_save));
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DEFINE(DT_ICOUNT_LEVEL_SAVE,
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offsetof(struct debug_table, icount_level_save));
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#endif
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/* struct exc_table */
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DEFINE(EXC_TABLE_KSTK, offsetof(struct exc_table, kstk));
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DEFINE(EXC_TABLE_DOUBLE_SAVE, offsetof(struct exc_table, double_save));
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DEFINE(EXC_TABLE_FIXUP, offsetof(struct exc_table, fixup));
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DEFINE(EXC_TABLE_PARAM, offsetof(struct exc_table, fixup_param));
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DEFINE(EXC_TABLE_FAST_USER,
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offsetof(struct exc_table, fast_user_handler));
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DEFINE(EXC_TABLE_FAST_KERNEL,
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offsetof(struct exc_table, fast_kernel_handler));
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DEFINE(EXC_TABLE_DEFAULT, offsetof(struct exc_table, default_handler));
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return 0;
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}
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