diff options
Diffstat (limited to 'arch/nios2/kernel/ptrace.c')
| -rw-r--r-- | arch/nios2/kernel/ptrace.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/nios2/kernel/ptrace.c b/arch/nios2/kernel/ptrace.c new file mode 100644 index 000000000..cd62f3107 --- /dev/null +++ b/arch/nios2/kernel/ptrace.c @@ -0,0 +1,145 @@ +/* + * Copyright (C) 2014 Altera Corporation + * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + */ + +#include <linux/elf.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/ptrace.h> +#include <linux/regset.h> +#include <linux/sched.h> +#include <linux/sched/task_stack.h> +#include <linux/uaccess.h> +#include <linux/user.h> + +static int genregs_get(struct task_struct *target, + const struct user_regset *regset, + struct membuf to) +{ + const struct pt_regs *regs = task_pt_regs(target); + const struct switch_stack *sw = (struct switch_stack *)regs - 1; + + membuf_zero(&to, 4); // R0 + membuf_write(&to, ®s->r1, 7 * 4); // R1..R7 + membuf_write(&to, ®s->r8, 8 * 4); // R8..R15 + membuf_write(&to, sw, 8 * 4); // R16..R23 + membuf_zero(&to, 2 * 4); /* et and bt */ + membuf_store(&to, regs->gp); + membuf_store(&to, regs->sp); + membuf_store(&to, regs->fp); + membuf_store(&to, regs->ea); + membuf_zero(&to, 4); // PTR_BA + membuf_store(&to, regs->ra); + membuf_store(&to, regs->ea); /* use ea for PC */ + return membuf_zero(&to, (NUM_PTRACE_REG - PTR_PC) * 4); +} + +/* + * Set the thread state from a regset passed in via ptrace + */ +static int genregs_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + struct pt_regs *regs = task_pt_regs(target); + const struct switch_stack *sw = (struct switch_stack *)regs - 1; + int ret = 0; + +#define REG_IGNORE_RANGE(START, END) \ + if (!ret) \ + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, \ + START * 4, (END * 4) + 4); + +#define REG_IN_ONE(PTR, LOC) \ + if (!ret) \ + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ + (void *)(PTR), LOC * 4, (LOC * 4) + 4); + +#define REG_IN_RANGE(PTR, START, END) \ + if (!ret) \ + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \ + (void *)(PTR), START * 4, (END * 4) + 4); + + REG_IGNORE_RANGE(PTR_R0, PTR_R0); + REG_IN_RANGE(®s->r1, PTR_R1, PTR_R7); + REG_IN_RANGE(®s->r8, PTR_R8, PTR_R15); + REG_IN_RANGE(sw, PTR_R16, PTR_R23); + REG_IGNORE_RANGE(PTR_R24, PTR_R25); /* et and bt */ + REG_IN_ONE(®s->gp, PTR_GP); + REG_IN_ONE(®s->sp, PTR_SP); + REG_IN_ONE(®s->fp, PTR_FP); + REG_IN_ONE(®s->ea, PTR_EA); + REG_IGNORE_RANGE(PTR_BA, PTR_BA); + REG_IN_ONE(®s->ra, PTR_RA); + REG_IN_ONE(®s->ea, PTR_PC); /* use ea for PC */ + if (!ret) + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + PTR_STATUS * 4, -1); + + return ret; +} + +/* + * Define the register sets available on Nios2 under Linux + */ +enum nios2_regset { + REGSET_GENERAL, +}; + +static const struct user_regset nios2_regsets[] = { + [REGSET_GENERAL] = { + .core_note_type = NT_PRSTATUS, + .n = NUM_PTRACE_REG, + .size = sizeof(unsigned long), + .align = sizeof(unsigned long), + .regset_get = genregs_get, + .set = genregs_set, + } +}; + +static const struct user_regset_view nios2_user_view = { + .name = "nios2", + .e_machine = ELF_ARCH, + .ei_osabi = ELF_OSABI, + .regsets = nios2_regsets, + .n = ARRAY_SIZE(nios2_regsets) +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + return &nios2_user_view; +} + +void ptrace_disable(struct task_struct *child) +{ + +} + +long arch_ptrace(struct task_struct *child, long request, unsigned long addr, + unsigned long data) +{ + return ptrace_request(child, request, addr, data); +} + +asmlinkage int do_syscall_trace_enter(void) +{ + int ret = 0; + + if (test_thread_flag(TIF_SYSCALL_TRACE)) + ret = ptrace_report_syscall_entry(task_pt_regs(current)); + + return ret; +} + +asmlinkage void do_syscall_trace_exit(void) +{ + if (test_thread_flag(TIF_SYSCALL_TRACE)) + ptrace_report_syscall_exit(task_pt_regs(current), 0); +} |