diff options
| -rw-r--r-- | arch/nios2/include/asm/ptrace.h | 33 | ||||
| -rw-r--r-- | arch/nios2/include/uapi/asm/ptrace.h | 120 | ||||
| -rw-r--r-- | arch/nios2/kernel/ptrace.c | 166 |
3 files changed, 319 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/ptrace.h b/arch/nios2/include/asm/ptrace.h new file mode 100644 index 00000000000..20fb1cf2dab --- /dev/null +++ b/arch/nios2/include/asm/ptrace.h @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2013 Altera Corporation + * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> + * Copyright (C) 2004 Microtronix Datacom Ltd + * + * based on m68k asm/processor.h + * + * 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. + */ + +#ifndef _ASM_NIOS2_PTRACE_H +#define _ASM_NIOS2_PTRACE_H + +#include <uapi/asm/ptrace.h> + +#ifndef __ASSEMBLY__ +#define user_mode(regs) (((regs)->estatus & ESTATUS_EU)) + +#define instruction_pointer(regs) ((regs)->ra) +#define profile_pc(regs) instruction_pointer(regs) +#define user_stack_pointer(regs) ((regs)->sp) +extern void show_regs(struct pt_regs *); + +#define current_pt_regs() \ + ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE)\ + - 1) + +int do_syscall_trace_enter(void); +void do_syscall_trace_exit(void); +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_NIOS2_PTRACE_H */ diff --git a/arch/nios2/include/uapi/asm/ptrace.h b/arch/nios2/include/uapi/asm/ptrace.h new file mode 100644 index 00000000000..e83a7c9d1c3 --- /dev/null +++ b/arch/nios2/include/uapi/asm/ptrace.h @@ -0,0 +1,120 @@ +/* + * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> + * Copyright (C) 2004 Microtronix Datacom Ltd + * + * based on m68k asm/processor.h + * + * 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. + */ + +#ifndef _UAPI_ASM_NIOS2_PTRACE_H +#define _UAPI_ASM_NIOS2_PTRACE_H + +#ifndef __ASSEMBLY__ + +/* + * Register numbers used by 'ptrace' system call interface. + */ + +/* GP registers */ +#define PTR_R0 0 +#define PTR_R1 1 +#define PTR_R2 2 +#define PTR_R3 3 +#define PTR_R4 4 +#define PTR_R5 5 +#define PTR_R6 6 +#define PTR_R7 7 +#define PTR_R8 8 +#define PTR_R9 9 +#define PTR_R10 10 +#define PTR_R11 11 +#define PTR_R12 12 +#define PTR_R13 13 +#define PTR_R14 14 +#define PTR_R15 15 +#define PTR_R16 16 +#define PTR_R17 17 +#define PTR_R18 18 +#define PTR_R19 19 +#define PTR_R20 20 +#define PTR_R21 21 +#define PTR_R22 22 +#define PTR_R23 23 +#define PTR_R24 24 +#define PTR_R25 25 +#define PTR_GP 26 +#define PTR_SP 27 +#define PTR_FP 28 +#define PTR_EA 29 +#define PTR_BA 30 +#define PTR_RA 31 +/* Control registers */ +#define PTR_PC 32 +#define PTR_STATUS 33 +#define PTR_ESTATUS 34 +#define PTR_BSTATUS 35 +#define PTR_IENABLE 36 +#define PTR_IPENDING 37 +#define PTR_CPUID 38 +#define PTR_CTL6 39 +#define PTR_CTL7 40 +#define PTR_PTEADDR 41 +#define PTR_TLBACC 42 +#define PTR_TLBMISC 43 + +#define NUM_PTRACE_REG (PTR_TLBMISC + 1) + +/* this struct defines the way the registers are stored on the + stack during a system call. + + There is a fake_regs in setup.c that has to match pt_regs.*/ + +struct pt_regs { + unsigned long r8; /* r8-r15 Caller-saved GP registers */ + unsigned long r9; + unsigned long r10; + unsigned long r11; + unsigned long r12; + unsigned long r13; + unsigned long r14; + unsigned long r15; + unsigned long r1; /* Assembler temporary */ + unsigned long r2; /* Retval LS 32bits */ + unsigned long r3; /* Retval MS 32bits */ + unsigned long r4; /* r4-r7 Register arguments */ + unsigned long r5; + unsigned long r6; + unsigned long r7; + unsigned long orig_r2; /* Copy of r2 ?? */ + unsigned long ra; /* Return address */ + unsigned long fp; /* Frame pointer */ + unsigned long sp; /* Stack pointer */ + unsigned long gp; /* Global pointer */ + unsigned long estatus; + unsigned long ea; /* Exception return address (pc) */ + unsigned long orig_r7; +}; + +/* + * This is the extended stack used by signal handlers and the context + * switcher: it's pushed after the normal "struct pt_regs". + */ +struct switch_stack { + unsigned long r16; /* r16-r23 Callee-saved GP registers */ + unsigned long r17; + unsigned long r18; + unsigned long r19; + unsigned long r20; + unsigned long r21; + unsigned long r22; + unsigned long r23; + unsigned long fp; + unsigned long gp; + unsigned long ra; +}; + +#endif /* __ASSEMBLY__ */ +#endif /* _UAPI_ASM_NIOS2_PTRACE_H */ diff --git a/arch/nios2/kernel/ptrace.c b/arch/nios2/kernel/ptrace.c new file mode 100644 index 00000000000..681dda92eff --- /dev/null +++ b/arch/nios2/kernel/ptrace.c @@ -0,0 +1,166 @@ +/* + * 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/tracehook.h> +#include <linux/uaccess.h> +#include <linux/user.h> + +static int genregs_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + const struct pt_regs *regs = task_pt_regs(target); + const struct switch_stack *sw = (struct switch_stack *)regs - 1; + int ret = 0; + +#define REG_O_ZERO_RANGE(START, END) \ + if (!ret) \ + ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, \ + START * 4, (END * 4) + 4); + +#define REG_O_ONE(PTR, LOC) \ + if (!ret) \ + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ + LOC * 4, (LOC * 4) + 4); + +#define REG_O_RANGE(PTR, START, END) \ + if (!ret) \ + ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, PTR, \ + START * 4, (END * 4) + 4); + + REG_O_ZERO_RANGE(PTR_R0, PTR_R0); + REG_O_RANGE(®s->r1, PTR_R1, PTR_R7); + REG_O_RANGE(®s->r8, PTR_R8, PTR_R15); + REG_O_RANGE(sw, PTR_R16, PTR_R23); + REG_O_ZERO_RANGE(PTR_R24, PTR_R25); /* et and bt */ + REG_O_ONE(®s->gp, PTR_GP); + REG_O_ONE(®s->sp, PTR_SP); + REG_O_ONE(®s->fp, PTR_FP); + REG_O_ONE(®s->ea, PTR_EA); + REG_O_ZERO_RANGE(PTR_BA, PTR_BA); + REG_O_ONE(®s->ra, PTR_RA); + REG_O_ONE(®s->ea, PTR_PC); /* use ea for PC */ + if (!ret) + ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, + PTR_STATUS * 4, -1); + + return ret; +} + +/* + * 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), + .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 = tracehook_report_syscall_entry(task_pt_regs(current)); + + return ret; +} + +asmlinkage void do_syscall_trace_exit(void) +{ + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_exit(task_pt_regs(current), 0); +} |