59da21398e
syscall_get_nr() currently returns a valid result only if the call chain of the traced process includes do_syscall_trace_enter(). But collect_syscall() can be called for any sleeping task, the result of syscall_get_nr() in general is completely bogus. To make syscall_get_nr() work for any sleeping task the traps field in pt_regs is replace with svcnr - the system call number the process is executing. If svcnr == 0 the process is not on a system call path. The syscall_get_arguments and syscall_set_arguments use regs->gprs[2] for the first system call parameter. This is incorrect since gprs[2] may have been overwritten with the system call number if the call chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
43 lines
1.7 KiB
C
43 lines
1.7 KiB
C
/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#include <linux/sched.h>
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#include <linux/kbuild.h>
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int main(void)
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{
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DEFINE(__THREAD_info, offsetof(struct task_struct, stack));
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DEFINE(__THREAD_ksp, offsetof(struct task_struct, thread.ksp));
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DEFINE(__THREAD_per, offsetof(struct task_struct, thread.per_info));
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DEFINE(__THREAD_mm_segment,
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offsetof(struct task_struct, thread.mm_segment));
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BLANK();
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DEFINE(__TASK_pid, offsetof(struct task_struct, pid));
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BLANK();
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DEFINE(__PER_atmid, offsetof(per_struct, lowcore.words.perc_atmid));
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DEFINE(__PER_address, offsetof(per_struct, lowcore.words.address));
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DEFINE(__PER_access_id, offsetof(per_struct, lowcore.words.access_id));
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BLANK();
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DEFINE(__TI_task, offsetof(struct thread_info, task));
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DEFINE(__TI_domain, offsetof(struct thread_info, exec_domain));
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DEFINE(__TI_flags, offsetof(struct thread_info, flags));
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DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
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DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
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BLANK();
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DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
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DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
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DEFINE(__PT_GPRS, offsetof(struct pt_regs, gprs));
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DEFINE(__PT_ORIG_GPR2, offsetof(struct pt_regs, orig_gpr2));
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DEFINE(__PT_ILC, offsetof(struct pt_regs, ilc));
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DEFINE(__PT_SVCNR, offsetof(struct pt_regs, svcnr));
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DEFINE(__PT_SIZE, sizeof(struct pt_regs));
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BLANK();
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DEFINE(__SF_BACKCHAIN, offsetof(struct stack_frame, back_chain));
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DEFINE(__SF_GPRS, offsetof(struct stack_frame, gprs));
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DEFINE(__SF_EMPTY, offsetof(struct stack_frame, empty1));
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return 0;
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}
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