d9a89a26e0
Impact: cleanup On x86_32, %gs is handled lazily. It's not saved and restored on kernel entry/exit but only when necessary which usually is during task switch but there are few other places. Currently, it's done by calling savesegment() and loadsegment() explicitly. Define get_user_gs(), set_user_gs() and task_user_gs() and use them instead. While at it, clean up register access macros in signal.c. This cleans up code a bit and will help future changes. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* a.out coredump register dumper
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_X86_A_OUT_CORE_H
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#define _ASM_X86_A_OUT_CORE_H
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#ifdef __KERNEL__
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#ifdef CONFIG_X86_32
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#include <linux/user.h>
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#include <linux/elfcore.h>
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/*
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* fill in the user structure for an a.out core dump
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*/
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static inline void aout_dump_thread(struct pt_regs *regs, struct user *dump)
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{
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/* changed the size calculations - should hopefully work better. lbt */
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dump->magic = CMAGIC;
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dump->start_code = 0;
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dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
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dump->u_tsize = ((unsigned long)current->mm->end_code) >> PAGE_SHIFT;
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dump->u_dsize = ((unsigned long)(current->mm->brk + (PAGE_SIZE - 1)))
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>> PAGE_SHIFT;
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dump->u_dsize -= dump->u_tsize;
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dump->u_ssize = 0;
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dump->u_debugreg[0] = current->thread.debugreg0;
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dump->u_debugreg[1] = current->thread.debugreg1;
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dump->u_debugreg[2] = current->thread.debugreg2;
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dump->u_debugreg[3] = current->thread.debugreg3;
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dump->u_debugreg[4] = 0;
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dump->u_debugreg[5] = 0;
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dump->u_debugreg[6] = current->thread.debugreg6;
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dump->u_debugreg[7] = current->thread.debugreg7;
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if (dump->start_stack < TASK_SIZE)
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dump->u_ssize = ((unsigned long)(TASK_SIZE - dump->start_stack))
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>> PAGE_SHIFT;
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dump->regs.bx = regs->bx;
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dump->regs.cx = regs->cx;
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dump->regs.dx = regs->dx;
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dump->regs.si = regs->si;
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dump->regs.di = regs->di;
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dump->regs.bp = regs->bp;
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dump->regs.ax = regs->ax;
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dump->regs.ds = (u16)regs->ds;
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dump->regs.es = (u16)regs->es;
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dump->regs.fs = (u16)regs->fs;
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dump->regs.gs = get_user_gs(regs);
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dump->regs.orig_ax = regs->orig_ax;
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dump->regs.ip = regs->ip;
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dump->regs.cs = (u16)regs->cs;
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dump->regs.flags = regs->flags;
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dump->regs.sp = regs->sp;
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dump->regs.ss = (u16)regs->ss;
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dump->u_fpvalid = dump_fpu(regs, &dump->i387);
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}
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#endif /* CONFIG_X86_32 */
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_A_OUT_CORE_H */
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