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139 lines
3.0 KiB
139 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Port on Texas Instruments TMS320C6x architecture |
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* |
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* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated |
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* Author: Aurelien Jacquiot ([email protected]) |
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* |
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* Updated for 2.6.34: Mark Salter <[email protected]> |
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*/ |
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#include <linux/ptrace.h> |
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#include <linux/tracehook.h> |
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#include <linux/regset.h> |
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#include <linux/elf.h> |
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#include <linux/sched/task_stack.h> |
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#include <asm/cacheflush.h> |
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#define PT_REG_SIZE (sizeof(struct pt_regs)) |
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/* |
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* Called by kernel/ptrace.c when detaching. |
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*/ |
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void ptrace_disable(struct task_struct *child) |
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{ |
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/* nothing to do */ |
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} |
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/* |
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* Get a register number from live pt_regs for the specified task. |
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*/ |
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static inline long get_reg(struct task_struct *task, int regno) |
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{ |
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long *addr = (long *)task_pt_regs(task); |
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if (regno == PT_TSR || regno == PT_CSR) |
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return 0; |
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return addr[regno]; |
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} |
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/* |
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* Write contents of register REGNO in task TASK. |
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*/ |
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static inline int put_reg(struct task_struct *task, |
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int regno, |
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unsigned long data) |
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{ |
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unsigned long *addr = (unsigned long *)task_pt_regs(task); |
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if (regno != PT_TSR && regno != PT_CSR) |
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addr[regno] = data; |
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return 0; |
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} |
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/* regset get/set implementations */ |
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static int gpr_get(struct task_struct *target, |
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const struct user_regset *regset, |
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struct membuf to) |
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{ |
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return membuf_write(&to, task_pt_regs(target), sizeof(struct pt_regs)); |
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} |
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enum c6x_regset { |
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REGSET_GPR, |
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}; |
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static const struct user_regset c6x_regsets[] = { |
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[REGSET_GPR] = { |
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.core_note_type = NT_PRSTATUS, |
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.n = ELF_NGREG, |
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.size = sizeof(u32), |
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.align = sizeof(u32), |
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.regset_get = gpr_get, |
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}, |
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}; |
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static const struct user_regset_view user_c6x_native_view = { |
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.name = "tic6x", |
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.e_machine = EM_TI_C6000, |
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.regsets = c6x_regsets, |
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.n = ARRAY_SIZE(c6x_regsets), |
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}; |
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const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
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{ |
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return &user_c6x_native_view; |
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} |
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/* |
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* Perform ptrace request |
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*/ |
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long arch_ptrace(struct task_struct *child, long request, |
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unsigned long addr, unsigned long data) |
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{ |
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int ret = 0; |
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switch (request) { |
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/* |
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* write the word at location addr. |
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*/ |
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case PTRACE_POKETEXT: |
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ret = generic_ptrace_pokedata(child, addr, data); |
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if (ret == 0 && request == PTRACE_POKETEXT) |
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flush_icache_range(addr, addr + 4); |
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break; |
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default: |
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ret = ptrace_request(child, request, addr, data); |
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break; |
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} |
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return ret; |
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} |
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/* |
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* handle tracing of system call entry |
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* - return the revised system call number or ULONG_MAX to cause ENOSYS |
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*/ |
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asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs) |
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{ |
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if (tracehook_report_syscall_entry(regs)) |
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/* tracing decided this syscall should not happen, so |
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* We'll return a bogus call number to get an ENOSYS |
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* error, but leave the original number in |
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* regs->orig_a4 |
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*/ |
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return ULONG_MAX; |
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return regs->b0; |
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} |
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/* |
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* handle tracing of system call exit |
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*/ |
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asmlinkage void syscall_trace_exit(struct pt_regs *regs) |
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{ |
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tracehook_report_syscall_exit(regs, 0); |
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}
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