5c39c0ab5e
To avoid multiple syscall restarts (multiple signals) or no restart at all (sigreturn), we need just an extra bit of state "literally 1 bit" in struct pt_regs. orig_r8 is the best place to do this, however given the way it is encoded currently, we can't add anything simplistically. Current orig_r8: * syscalls -> 1 to NR_SYSCALLS * Exceptions -> NR_SYSCALLS + 1 * Break-point-> NR_SYSCALLS + 2 In new scheme it is a bit-field * lower short word contains the exact event type (and a new bit to represent restart semantics : if syscall was already / can't be restarted) * upper short word optionally containing the syscall num - needed by likes of tracehooks etc This patch only changes how orig_r8 is organised and nothing should change behaviourily. Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Al Viro <viro@ZenIV.linux.org.uk>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/thread_info.h>
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#include <linux/kbuild.h>
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#include <asm/hardirq.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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int main(void)
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{
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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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BLANK();
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DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
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DEFINE(THREAD_CALLEE_REG, offsetof(struct thread_struct, callee_reg));
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DEFINE(THREAD_FAULT_ADDR,
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offsetof(struct thread_struct, fault_address));
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BLANK();
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DEFINE(THREAD_INFO_FLAGS, offsetof(struct thread_info, flags));
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DEFINE(THREAD_INFO_PREEMPT_COUNT,
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offsetof(struct thread_info, preempt_count));
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BLANK();
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DEFINE(TASK_ACT_MM, offsetof(struct task_struct, active_mm));
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DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
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DEFINE(MM_CTXT, offsetof(struct mm_struct, context));
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DEFINE(MM_PGD, offsetof(struct mm_struct, pgd));
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DEFINE(MM_CTXT_ASID, offsetof(mm_context_t, asid));
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BLANK();
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DEFINE(PT_status32, offsetof(struct pt_regs, status32));
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DEFINE(PT_orig_r8, offsetof(struct pt_regs, orig_r8_word));
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DEFINE(PT_sp, offsetof(struct pt_regs, sp));
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DEFINE(PT_r0, offsetof(struct pt_regs, r0));
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DEFINE(PT_r1, offsetof(struct pt_regs, r1));
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DEFINE(PT_r2, offsetof(struct pt_regs, r2));
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DEFINE(PT_r3, offsetof(struct pt_regs, r3));
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DEFINE(PT_r4, offsetof(struct pt_regs, r4));
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DEFINE(PT_r5, offsetof(struct pt_regs, r5));
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DEFINE(PT_r6, offsetof(struct pt_regs, r6));
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DEFINE(PT_r7, offsetof(struct pt_regs, r7));
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return 0;
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}
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