2337dc6430
This is a pure syntax patch to create an interface to enable and later restore write access to the kernel text and other read-only mapped regions. It is in line with e.g. vm_fault_disable_pagefaults() by allowing the nesting. Discussed with: Peter Lei <peter.lei@ieee.org> Reviewed by: jtl Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D14768
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*-
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Interface to new debugger.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kdb.h>
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#include <sys/pcpu.h>
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#include <machine/cpufunc.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#include <ddb/ddb.h>
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/*
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* Read bytes from kernel address space for debugger.
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*/
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int
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db_read_bytes(vm_offset_t addr, size_t size, char *data)
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{
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jmp_buf jb;
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void *prev_jb;
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char *src;
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int ret;
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prev_jb = kdb_jmpbuf(jb);
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ret = setjmp(jb);
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if (ret == 0) {
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src = (char *)addr;
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while (size-- > 0)
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*data++ = *src++;
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}
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(void)kdb_jmpbuf(prev_jb);
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return (ret);
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}
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/*
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* Write bytes to kernel address space for debugger.
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* We need to disable write protection temporarily so we can write
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* things (such as break points) that might be in write-protected
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* memory.
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*/
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int
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db_write_bytes(vm_offset_t addr, size_t size, char *data)
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{
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jmp_buf jb;
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void *prev_jb;
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char *dst;
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bool old_wp;
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int ret;
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old_wp = false;
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prev_jb = kdb_jmpbuf(jb);
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ret = setjmp(jb);
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if (ret == 0) {
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old_wp = disable_wp();
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dst = (char *)addr;
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while (size-- > 0)
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*dst++ = *data++;
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}
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restore_wp(old_wp);
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(void)kdb_jmpbuf(prev_jb);
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return (ret);
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}
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void
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db_show_mdpcpu(struct pcpu *pc)
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{
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db_printf("curpmap = %p\n", pc->pc_curpmap);
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db_printf("tssp = %p\n", pc->pc_tssp);
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db_printf("commontssp = %p\n", pc->pc_commontssp);
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db_printf("rsp0 = 0x%lx\n", pc->pc_rsp0);
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db_printf("gs32p = %p\n", pc->pc_gs32p);
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db_printf("ldt = %p\n", pc->pc_ldt);
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db_printf("tss = %p\n", pc->pc_tss);
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}
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