diff options
| -rw-r--r-- | arch/nds32/include/uapi/asm/ptrace.h | 25 | ||||
| -rw-r--r-- | arch/nds32/kernel/ptrace.c | 119 |
2 files changed, 144 insertions, 0 deletions
diff --git a/arch/nds32/include/uapi/asm/ptrace.h b/arch/nds32/include/uapi/asm/ptrace.h new file mode 100644 index 000000000000..358c99e399d0 --- /dev/null +++ b/arch/nds32/include/uapi/asm/ptrace.h @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#ifndef __UAPI_ASM_NDS32_PTRACE_H +#define __UAPI_ASM_NDS32_PTRACE_H + +#ifndef __ASSEMBLY__ + +/* + * User structures for general purpose register. + */ +struct user_pt_regs { + long uregs[26]; + long fp; + long gp; + long lp; + long sp; + long ipc; + long lb; + long le; + long lc; + long syscallno; +}; +#endif +#endif diff --git a/arch/nds32/kernel/ptrace.c b/arch/nds32/kernel/ptrace.c new file mode 100644 index 000000000000..eaaf7a999b20 --- /dev/null +++ b/arch/nds32/kernel/ptrace.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#include <linux/ptrace.h> +#include <linux/regset.h> +#include <linux/tracehook.h> +#include <linux/elf.h> +#include <linux/sched/task_stack.h> + +enum nds32_regset { + REGSET_GPR, +}; + +static int gpr_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user * ubuf) +{ + struct user_pt_regs *uregs = &task_pt_regs(target)->user_regs; + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, uregs, 0, -1); +} + +static int gpr_set(struct task_struct *target, const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user * ubuf) +{ + int err; + struct user_pt_regs newregs = task_pt_regs(target)->user_regs; + + err = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &newregs, 0, -1); + if (err) + return err; + + task_pt_regs(target)->user_regs = newregs; + return 0; +} + +static const struct user_regset nds32_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, + .n = sizeof(struct user_pt_regs) / sizeof(u32), + .size = sizeof(elf_greg_t), + .align = sizeof(elf_greg_t), + .get = gpr_get, + .set = gpr_set} +}; + +static const struct user_regset_view nds32_user_view = { + .name = "nds32", + .e_machine = EM_NDS32, + .regsets = nds32_regsets, + .n = ARRAY_SIZE(nds32_regsets) +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + return &nds32_user_view; +} + +void ptrace_disable(struct task_struct *child) +{ + user_disable_single_step(child); +} + +/* do_ptrace() + * + * Provide ptrace defined service. + */ +long arch_ptrace(struct task_struct *child, long request, unsigned long addr, + unsigned long data) +{ + int ret = -EIO; + + switch (request) { + default: + ret = ptrace_request(child, request, addr, data); + break; + } + + return ret; +} + +void user_enable_single_step(struct task_struct *child) +{ + struct pt_regs *regs; + regs = task_pt_regs(child); + regs->ipsw |= PSW_mskHSS; + set_tsk_thread_flag(child, TIF_SINGLESTEP); +} + +void user_disable_single_step(struct task_struct *child) +{ + struct pt_regs *regs; + regs = task_pt_regs(child); + regs->ipsw &= ~PSW_mskHSS; + clear_tsk_thread_flag(child, TIF_SINGLESTEP); +} + +/* sys_trace() + * + * syscall trace handler. + */ + +asmlinkage int syscall_trace_enter(struct pt_regs *regs) +{ + if (test_thread_flag(TIF_SYSCALL_TRACE)) { + if (tracehook_report_syscall_entry(regs)) + forget_syscall(regs); + } + return regs->syscallno; +} + +asmlinkage void syscall_trace_leave(struct pt_regs *regs) +{ + int step = test_thread_flag(TIF_SINGLESTEP); + if (step || test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(regs, step); + +} |