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f55d966536
We're approaching 20 locations where we need to check for ELF ABI v2. That's fine, except the logic is a bit awkward, because we have to check that _CALL_ELF is defined and then what its value is. So check it once in asm/types.h and define PPC64_ELF_ABI_v2 when ELF ABI v2 is detected. We also have a few places where what we're really trying to check is that we are using the 64-bit v1 ABI, ie. function descriptors. So also add a #define for that, which simplifies several checks. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
#ifndef _ASM_POWERPC_KPROBES_H
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#define _ASM_POWERPC_KPROBES_H
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#ifdef __KERNEL__
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/*
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* Kernel Probes (KProbes)
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2002, 2004
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*
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* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
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* Probes initial implementation ( includes suggestions from
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* Rusty Russell).
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* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
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* <ananth@in.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#include <asm/probes.h>
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#include <asm/code-patching.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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struct pt_regs;
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struct kprobe;
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typedef ppc_opcode_t kprobe_opcode_t;
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#define MAX_INSN_SIZE 1
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#ifdef PPC64_ELF_ABI_v2
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/* PPC64 ABIv2 needs local entry point */
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#define kprobe_lookup_name(name, addr) \
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{ \
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addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
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if (addr) \
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addr = (kprobe_opcode_t *)ppc_function_entry(addr); \
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}
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#elif defined(PPC64_ELF_ABI_v1)
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/*
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* 64bit powerpc ABIv1 uses function descriptors:
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* - Check for the dot variant of the symbol first.
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* - If that fails, try looking up the symbol provided.
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*
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* This ensures we always get to the actual symbol and not the descriptor.
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* Also handle <module:symbol> format.
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*/
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#define kprobe_lookup_name(name, addr) \
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{ \
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char dot_name[MODULE_NAME_LEN + 1 + KSYM_NAME_LEN]; \
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char *modsym; \
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bool dot_appended = false; \
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if ((modsym = strchr(name, ':')) != NULL) { \
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modsym++; \
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if (*modsym != '\0' && *modsym != '.') { \
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/* Convert to <module:.symbol> */ \
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strncpy(dot_name, name, modsym - name); \
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dot_name[modsym - name] = '.'; \
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dot_name[modsym - name + 1] = '\0'; \
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strncat(dot_name, modsym, \
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sizeof(dot_name) - (modsym - name) - 2);\
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dot_appended = true; \
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} else { \
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dot_name[0] = '\0'; \
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strncat(dot_name, name, sizeof(dot_name) - 1); \
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} \
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} else if (name[0] != '.') { \
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dot_name[0] = '.'; \
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dot_name[1] = '\0'; \
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strncat(dot_name, name, KSYM_NAME_LEN - 2); \
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dot_appended = true; \
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} else { \
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dot_name[0] = '\0'; \
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strncat(dot_name, name, KSYM_NAME_LEN - 1); \
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} \
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addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
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if (!addr && dot_appended) { \
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/* Let's try the original non-dot symbol lookup */ \
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addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
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} \
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}
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#endif
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#define flush_insn_slot(p) do { } while (0)
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#define kretprobe_blacklist_size 0
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void kretprobe_trampoline(void);
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extern void arch_remove_kprobe(struct kprobe *p);
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/* Architecture specific copy of original instruction */
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struct arch_specific_insn {
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/* copy of original instruction */
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kprobe_opcode_t *insn;
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/*
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* Set in kprobes code, initially to 0. If the instruction can be
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* eumulated, this is set to 1, if not, to -1.
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*/
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int boostable;
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};
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned long status;
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unsigned long saved_msr;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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unsigned long kprobe_saved_msr;
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struct pt_regs jprobe_saved_regs;
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struct prev_kprobe prev_kprobe;
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};
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extern int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_KPROBES_H */
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