^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) // Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) // Copyright (C) 2005-2017 Andes Technology Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #ifndef _ASM_NDS32_SYSCALL_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #define _ASM_NDS32_SYSCALL_H 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <uapi/linux/audit.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) struct task_struct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) struct pt_regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * syscall_get_nr - find what system call a task is executing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * @task: task of interest, must be blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * If @task is executing a system call or is at system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * tracing about to attempt one, returns the system call number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * If @task is not executing a system call, i.e. it's blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * inside the kernel for a fault or signal, returns -1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Note this returns int even on 64-bit machines. Only 32 bits of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * system call number can be meaningful. If the actual arch value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * is 64 bits, this truncates to 32 bits so 0xffffffff means -1.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * It's only valid to call this when @task is known to be blocked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return regs->syscallno;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * syscall_rollback - roll back registers after an aborted system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * @task: task of interest, must be in system call exit tracing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * It's only valid to call this when @task is stopped for system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * call exit tracing (due to TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * after tracehook_report_syscall_entry() returned nonzero to prevent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * the system call from taking place.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * This rolls back the register state in @regs so it's as if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * system call instruction was a no-op. The registers containing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * the system call number and arguments are as they were before the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * system call instruction. This may not be the same as what the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * register state looked like at system call entry tracing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) syscall_rollback(struct task_struct *task, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) regs->uregs[0] = regs->orig_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * syscall_get_error - check result of traced system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @task: task of interest, must be blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * Returns 0 if the system call succeeded, or -ERRORCODE if it failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * It's only valid to call this when @task is stopped for tracing on exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static inline long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) syscall_get_error(struct task_struct *task, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) unsigned long error = regs->uregs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return IS_ERR_VALUE(error) ? error : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * syscall_get_return_value - get the return value of a traced system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @task: task of interest, must be blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Returns the return value of the successful system call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * This value is meaningless if syscall_get_error() returned nonzero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * It's only valid to call this when @task is stopped for tracing on exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static inline long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return regs->uregs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * syscall_set_return_value - change the return value of a traced system call
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * @task: task of interest, must be blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * @error: negative error code, or zero to indicate success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * @val: user return value if @error is zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * This changes the results of the system call that user mode will see.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * If @error is zero, the user sees a successful system call with a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * return value of @val. If @error is nonzero, it's a negated errno
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * code; the user sees a failed system call with this errno code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * It's only valid to call this when @task is stopped for tracing on exit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) int error, long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) regs->uregs[0] = (long)error ? error : val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * syscall_get_arguments - extract system call parameter values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * @task: task of interest, must be blocked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * @args: array filled with argument values
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * Fetches 6 arguments to the system call (from 0 through 5). The first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * argument is stored in @args[0], and so on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * It's only valid to call this when @task is stopped for tracing on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * entry to a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #define SYSCALL_MAX_ARGS 6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) unsigned long *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) args[0] = regs->orig_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) memcpy(args, ®s->uregs[0] + 1, 5 * sizeof(args[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * syscall_set_arguments - change system call parameter value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * @task: task of interest, must be in system call entry tracing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * @regs: task_pt_regs() of @task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * @args: array of argument values to store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * Changes 6 arguments to the system call. The first argument gets value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * @args[0], and so on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * It's only valid to call this when @task is stopped for tracing on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * entry to a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) const unsigned long *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) regs->orig_r0 = args[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) args++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) memcpy(®s->uregs[0] + 1, args, 5 * sizeof(args[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) syscall_get_arch(struct task_struct *task)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) ? AUDIT_ARCH_NDS32BE : AUDIT_ARCH_NDS32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) #endif /* _ASM_NDS32_SYSCALL_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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