ptrace.c (12c3dca25d2fa17a101de0d80bf3f238b1cecbae) ptrace.c (4e57a4ddf6b0d9cce1cf2ffd153df1ad3c2c9cc2)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/kernel/ptrace.c
4 *
5 * By Ross Biro 1/23/92
6 * edited by Linus Torvalds
7 * ARM modifications Copyright (C) 2000 Russell King
8 */

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20#include <linux/uaccess.h>
21#include <linux/perf_event.h>
22#include <linux/hw_breakpoint.h>
23#include <linux/regset.h>
24#include <linux/audit.h>
25#include <linux/tracehook.h>
26#include <linux/unistd.h>
27
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/kernel/ptrace.c
4 *
5 * By Ross Biro 1/23/92
6 * edited by Linus Torvalds
7 * ARM modifications Copyright (C) 2000 Russell King
8 */

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20#include <linux/uaccess.h>
21#include <linux/perf_event.h>
22#include <linux/hw_breakpoint.h>
23#include <linux/regset.h>
24#include <linux/audit.h>
25#include <linux/tracehook.h>
26#include <linux/unistd.h>
27
28#include <asm/syscall.h>
28#include <asm/traps.h>
29
30#define CREATE_TRACE_POINTS
31#include <trace/events/syscalls.h>
32
33#define REG_PC 15
34#define REG_PSR 16
35/*

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313 return -EACCES;
314 iwmmxt_task_release(thread); /* force a reload */
315 return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
316 ? -EFAULT : 0;
317}
318
319#endif
320
29#include <asm/traps.h>
30
31#define CREATE_TRACE_POINTS
32#include <trace/events/syscalls.h>
33
34#define REG_PC 15
35#define REG_PSR 16
36/*

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314 return -EACCES;
315 iwmmxt_task_release(thread); /* force a reload */
316 return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE)
317 ? -EFAULT : 0;
318}
319
320#endif
321
322#ifdef CONFIG_CRUNCH
323/*
324 * Get the child Crunch state.
325 */
326static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp)
327{
328 struct thread_info *thread = task_thread_info(tsk);
329
330 crunch_task_disable(thread); /* force it to ram */
331 return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE)
332 ? -EFAULT : 0;
333}
334
335/*
336 * Set the child Crunch state.
337 */
338static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp)
339{
340 struct thread_info *thread = task_thread_info(tsk);
341
342 crunch_task_release(thread); /* force a reload */
343 return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE)
344 ? -EFAULT : 0;
345}
346#endif
347
321#ifdef CONFIG_HAVE_HW_BREAKPOINT
322/*
323 * Convert a virtual register number into an index for a thread_info
324 * breakpoint array. Breakpoints are identified using positive numbers
325 * whilst watchpoints are negative. The registers are laid out as pairs
326 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
327 * Register 0 is reserved for describing resource information.
328 */

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780#endif
781
782 case PTRACE_GET_THREAD_AREA:
783 ret = put_user(task_thread_info(child)->tp_value[0],
784 datap);
785 break;
786
787 case PTRACE_SET_SYSCALL:
348#ifdef CONFIG_HAVE_HW_BREAKPOINT
349/*
350 * Convert a virtual register number into an index for a thread_info
351 * breakpoint array. Breakpoints are identified using positive numbers
352 * whilst watchpoints are negative. The registers are laid out as pairs
353 * of (address, control), each pair mapping to a unique hw_breakpoint struct.
354 * Register 0 is reserved for describing resource information.
355 */

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807#endif
808
809 case PTRACE_GET_THREAD_AREA:
810 ret = put_user(task_thread_info(child)->tp_value[0],
811 datap);
812 break;
813
814 case PTRACE_SET_SYSCALL:
788 task_thread_info(child)->syscall = data;
815 task_thread_info(child)->abi_syscall = data &
816 __NR_SYSCALL_MASK;
789 ret = 0;
790 break;
791
817 ret = 0;
818 break;
819
820#ifdef CONFIG_CRUNCH
821 case PTRACE_GETCRUNCHREGS:
822 ret = ptrace_getcrunchregs(child, datap);
823 break;
824
825 case PTRACE_SETCRUNCHREGS:
826 ret = ptrace_setcrunchregs(child, datap);
827 break;
828#endif
829
792#ifdef CONFIG_VFP
793 case PTRACE_GETVFPREGS:
794 ret = copy_regset_to_user(child,
795 &user_arm_view, REGSET_VFP,
796 0, ARM_VFPREGS_SIZE,
797 datap);
798 break;
799

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839 * IP = 0 -> entry, =1 -> exit
840 */
841 ip = regs->ARM_ip;
842 regs->ARM_ip = dir;
843
844 if (dir == PTRACE_SYSCALL_EXIT)
845 tracehook_report_syscall_exit(regs, 0);
846 else if (tracehook_report_syscall_entry(regs))
830#ifdef CONFIG_VFP
831 case PTRACE_GETVFPREGS:
832 ret = copy_regset_to_user(child,
833 &user_arm_view, REGSET_VFP,
834 0, ARM_VFPREGS_SIZE,
835 datap);
836 break;
837

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877 * IP = 0 -> entry, =1 -> exit
878 */
879 ip = regs->ARM_ip;
880 regs->ARM_ip = dir;
881
882 if (dir == PTRACE_SYSCALL_EXIT)
883 tracehook_report_syscall_exit(regs, 0);
884 else if (tracehook_report_syscall_entry(regs))
847 current_thread_info()->syscall = -1;
885 current_thread_info()->abi_syscall = -1;
848
849 regs->ARM_ip = ip;
850}
851
886
887 regs->ARM_ip = ip;
888}
889
852asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno)
890asmlinkage int syscall_trace_enter(struct pt_regs *regs)
853{
891{
854 current_thread_info()->syscall = scno;
892 int scno;
855
856 if (test_thread_flag(TIF_SYSCALL_TRACE))
857 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
858
859 /* Do seccomp after ptrace; syscall may have changed. */
860#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
861 if (secure_computing() == -1)
862 return -1;
863#else
864 /* XXX: remove this once OABI gets fixed */
893
894 if (test_thread_flag(TIF_SYSCALL_TRACE))
895 tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
896
897 /* Do seccomp after ptrace; syscall may have changed. */
898#ifdef CONFIG_HAVE_ARCH_SECCOMP_FILTER
899 if (secure_computing() == -1)
900 return -1;
901#else
902 /* XXX: remove this once OABI gets fixed */
865 secure_computing_strict(current_thread_info()->syscall);
903 secure_computing_strict(syscall_get_nr(current, regs));
866#endif
867
868 /* Tracer or seccomp may have changed syscall. */
904#endif
905
906 /* Tracer or seccomp may have changed syscall. */
869 scno = current_thread_info()->syscall;
907 scno = syscall_get_nr(current, regs);
870
871 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
872 trace_sys_enter(regs, scno);
873
874 audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2,
875 regs->ARM_r3);
876
877 return scno;

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909 if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
910 trace_sys_enter(regs, scno);
911
912 audit_syscall_entry(scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2,
913 regs->ARM_r3);
914
915 return scno;

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