[PATCH v5 21/25] unicore32: add asm/syscall.h

syscall_get_* functions are required to be implemented on all architectures in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request. This introduces asm/syscall.h on unicore32 implementing all 5 syscall_get_* functions as documented in asm-generic/syscall.h: syscall_get_nr, syscall_get_arguments, syscall_get_error, syscall_get_return_value, and syscall_get_arch. A note for the unicore32 architecture maintainer: I have no idea about the syscall semantics on this architecture, and the code is of little help here. All I could infer from the code is that it looks very similar to ARM, so the implementation of syscall_get_* functions is also similar to ARM. Cc: Guan Xuetao <gxt(a)pku.edu.cn&gt; Cc: Paul Moore <paul(a)paul-moore.com&gt; Cc: Eric Paris <eparis(a)redhat.com&gt; Cc: Oleg Nesterov <oleg(a)redhat.com&gt; Cc: Andy Lutomirski <luto(a)kernel.org&gt; Cc: Elvira Khabirova <lineprinter(a)altlinux.org&gt; Cc: Eugene Syromyatnikov <esyr(a)redhat.com&gt; Cc: linux-audit(a)redhat.com Signed-off-by: Dmitry V. Levin <ldv(a)altlinux.org&gt; --- Notes: v5: added syscall_get_nr, syscall_get_arguments, syscall_get_error, and syscall_get_return_value v1: added syscall_get_arch arch/unicore32/include/asm/syscall.h | 45 ++++++++++++++++++++++++++++ include/uapi/linux/audit.h | 1 + 2 files changed, 46 insertions(+) create mode 100644 arch/unicore32/include/asm/syscall.h diff --git a/arch/unicore32/include/asm/syscall.h b/arch/unicore32/include/asm/syscall.h new file mode 100644 index 000000000000..e30d08acf359 --- /dev/null +++ b/arch/unicore32/include/asm/syscall.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_UNICORE_SYSCALL_H +#define _ASM_UNICORE_SYSCALL_H + +#include <uapi/linux/audit.h> + +static inline int +syscall_get_nr(struct task_struct *task, struct pt_regs *regs) +{ + return task_thread_info(task)->syscall; +} + +static inline void +syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, + unsigned int i, unsigned int n, unsigned long *args) +{ + BUG_ON(i + n > 6); + if (i == 0) { + args[0] = regs->UCreg_ORIG_00; + args++; + i++; + n--; + } + memcpy(args, &regs->UCreg_00 + i, n * sizeof(args[0])); +} + +static inline long +syscall_get_error(struct task_struct *task, struct pt_regs *regs) +{ + return IS_ERR_VALUE(regs->UCreg_00) ? regs->UCreg_00 : 0; +} + +static inline long +syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) +{ + return regs->UCreg_00; +} + +static inline int +syscall_get_arch(void) +{ + return AUDIT_ARCH_UNICORE; +} + +#endif /* _ASM_UNICORE_SYSCALL_H */ diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index bcc0619b046f..3901c51c0b93 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -424,6 +424,7 @@ enum { #define AUDIT_ARCH_TILEGX (EM_TILEGX|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) #define AUDIT_ARCH_TILEGX32 (EM_TILEGX|__AUDIT_ARCH_LE) #define AUDIT_ARCH_TILEPRO (EM_TILEPRO|__AUDIT_ARCH_LE) +#define AUDIT_ARCH_UNICORE (EM_UNICORE|__AUDIT_ARCH_LE) #define AUDIT_ARCH_X86_64 (EM_X86_64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE) #define AUDIT_ARCH_XTENSA (EM_XTENSA) -- ldv