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compatdefs.h
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/* Compatibility definitions for older kernels. * Copyright (C) 2010 Red Hat Inc. * * This file is part of systemtap, and is free software. You can * redistribute it and/or modify it under the terms of the GNU General * Public License (GPL); either version 2, or (at your option) any * later version. */ #ifndef _STP_COMPAT_H_ /* -*- linux-c -*- */ #define _STP_COMPAT_H_ #ifdef CONFIG_COMPAT /* x86_64 has a different flag name from all other arches and s390... */ #include <linux/thread_info.h> #if defined (__x86_64__) #define TIF_32BIT TIF_IA32 #endif #if defined(__s390__) || defined(__s390x__) #define TIF_32BIT TIF_31BIT #endif #if defined (__mips__) && !defined(TIF_32BIT) #ifdef CONFIG_MIPS32_O32 #define TIF_32BIT TIF_32BIT_REGS #elif defined(CONFIG_MIPS32_N32) #define TIF_32BIT TIF_32BIT_ADDR #endif #endif #if !defined(TIF_32BIT) #error architecture not supported, no TIF_32BIT flag #endif /* _stp_is_compat_task - returns true if this is a 32-on-64 bit user task. Note that some kernels/architectures define a function called is_compat_task(), but that just tests for being inside a 32bit compat syscall. We want to test whether the current task is a 32 bit compat task itself.*/ static inline int _stp_is_compat_task(void) { return test_thread_flag(TIF_32BIT); } #else static inline int _stp_is_compat_task(void) { return 0; } #endif /* CONFIG_COMPAT */ /* task_pt_regs is used in some core tapset functions, so try to make * sure something sensible is defined. task_pt_regs is required for * the tracehook interface api so is normally defined already. */ #include <asm/processor.h> #include <asm/ptrace.h> #include <linux/sched.h> #if defined(STAPCONF_LINUX_SCHED_HEADERS) #include <linux/sched/task_stack.h> #endif #if !defined(task_pt_regs) #if defined(__powerpc__) #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.regs) #endif #if defined(__x86_64__) #define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.rsp0 - 1) #endif #if defined(__ia64__) /* pre-commit 6450578f32 */ #define task_pt_regs(tsk) ia64_task_regs(tsk) #endif #endif /* Always use _stp_current_pt_regs() in tapset/runtime code to make sure the returned user pt_regs are sane. */ #define _stp_current_pt_regs() (current->mm ? task_pt_regs(current) : NULL) /* Whether all user registers are valid. If not the pt_regs needs, * architecture specific, scrubbing before usage (in the unwinder). * XXX Currently very simple heuristics, just check arch. Should * user task and user pt_regs state. * * See arch specific "scrubbing" code in runtime/unwind/<arch>.h */ static inline int _stp_task_pt_regs_valid(struct task_struct *task, struct pt_regs *uregs) { /* It would be nice to just use syscall_get_nr(task, uregs) < 0 * but that might trigger false negatives or false positives * (bad syscall numbers or syscall tracing being in effect). */ #if defined(__i386__) return 1; /* i386 has so little registers, all are saved. */ #elif defined(__x86_64__) return 0; #endif return 0; } #endif /* _STP_COMPAT_H_ */