diff options
Diffstat (limited to 'arch/c6x/kernel/ptrace.c')
| -rw-r--r-- | arch/c6x/kernel/ptrace.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/arch/c6x/kernel/ptrace.c b/arch/c6x/kernel/ptrace.c new file mode 100644 index 000000000000..3c494e84444d --- /dev/null +++ b/arch/c6x/kernel/ptrace.c @@ -0,0 +1,187 @@ +/* + * Port on Texas Instruments TMS320C6x architecture + * + * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated + * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) + * + * Updated for 2.6.34: Mark Salter <msalter@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/ptrace.h> +#include <linux/tracehook.h> +#include <linux/regset.h> +#include <linux/elf.h> + +#include <asm/cacheflush.h> + +#define PT_REG_SIZE (sizeof(struct pt_regs)) + +/* + * Called by kernel/ptrace.c when detaching. + */ +void ptrace_disable(struct task_struct *child) +{ + /* nothing to do */ +} + +/* + * Get a register number from live pt_regs for the specified task. + */ +static inline long get_reg(struct task_struct *task, int regno) +{ + long *addr = (long *)task_pt_regs(task); + + if (regno == PT_TSR || regno == PT_CSR) + return 0; + + return addr[regno]; +} + +/* + * Write contents of register REGNO in task TASK. + */ +static inline int put_reg(struct task_struct *task, + int regno, + unsigned long data) +{ + unsigned long *addr = (unsigned long *)task_pt_regs(task); + + if (regno != PT_TSR && regno != PT_CSR) + addr[regno] = data; + + return 0; +} + +/* regset get/set implementations */ + +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 pt_regs *regs = task_pt_regs(target); + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + regs, + 0, sizeof(*regs)); +} + +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 ret; + struct pt_regs *regs = task_pt_regs(target); + + /* Don't copyin TSR or CSR */ + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + ®s, + 0, PT_TSR * sizeof(long)); + if (ret) + return ret; + + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + PT_TSR * sizeof(long), + (PT_TSR + 1) * sizeof(long)); + if (ret) + return ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + ®s, + (PT_TSR + 1) * sizeof(long), + PT_CSR * sizeof(long)); + if (ret) + return ret; + + ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, + PT_CSR * sizeof(long), + (PT_CSR + 1) * sizeof(long)); + if (ret) + return ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, + ®s, + (PT_CSR + 1) * sizeof(long), -1); + return ret; +} + +enum c6x_regset { + REGSET_GPR, +}; + +static const struct user_regset c6x_regsets[] = { + [REGSET_GPR] = { + .core_note_type = NT_PRSTATUS, + .n = ELF_NGREG, + .size = sizeof(u32), + .align = sizeof(u32), + .get = gpr_get, + .set = gpr_set + }, +}; + +static const struct user_regset_view user_c6x_native_view = { + .name = "tic6x", + .e_machine = EM_TI_C6000, + .regsets = c6x_regsets, + .n = ARRAY_SIZE(c6x_regsets), +}; + +const struct user_regset_view *task_user_regset_view(struct task_struct *task) +{ + return &user_c6x_native_view; +} + +/* + * Perform ptrace request + */ +long arch_ptrace(struct task_struct *child, long request, + unsigned long addr, unsigned long data) +{ + int ret = 0; + + switch (request) { + /* + * write the word at location addr. + */ + case PTRACE_POKETEXT: + ret = generic_ptrace_pokedata(child, addr, data); + if (ret == 0 && request == PTRACE_POKETEXT) + flush_icache_range(addr, addr + 4); + break; + default: + ret = ptrace_request(child, request, addr, data); + break; + } + + return ret; +} + +/* + * handle tracing of system call entry + * - return the revised system call number or ULONG_MAX to cause ENOSYS + */ +asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs) +{ + if (tracehook_report_syscall_entry(regs)) + /* tracing decided this syscall should not happen, so + * We'll return a bogus call number to get an ENOSYS + * error, but leave the original number in + * regs->orig_a4 + */ + return ULONG_MAX; + + return regs->b0; +} + +/* + * handle tracing of system call exit + */ +asmlinkage void syscall_trace_exit(struct pt_regs *regs) +{ + tracehook_report_syscall_exit(regs, 0); +} |