1 // SPDX-License-Identifier: GPL-2.0
48  * Processes always block with the following stack-layout:
50  *  +================================+ <---- task + 2*PAGE_SIZE
51  *  | PALcode saved frame (ps, pc,   | ^
66  * which the register is saved.  Register indices are 0-31 for integer
67  * regs, 32-63 for fp regs, and 64 for the pc.  Notice that sp and
68  * zero have no stack-slot and need to be treated specially (see
76   (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
79  (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
90 	PT_REG(	  r28), PT_REG(	   gp),		   -1,		   -1,
99 	PT_REG(	   pc)
113 		addr = &task_thread_info(task)->pcb.usp;  in get_reg_addr()
115 		addr = &task_thread_info(task)->pcb.unique;  in get_reg_addr()
131 	/* Special hack for fpcr -- combine hardware and software bits.  */  in get_reg()
135 		  = task_thread_info(task)->ieee_state & IEEE_SW_MASK;  in get_reg()
143  * Write contents of register REGNO in task TASK.
149 		task_thread_info(task)->ieee_state  in put_reg()
150 		  = ((task_thread_info(task)->ieee_state & ~IEEE_SW_MASK)  in put_reg()
163 	return (copied == sizeof(int)) ? 0 : -EIO;  in read_int()
171 	return (copied == sizeof(int)) ? 0 : -EIO;  in write_int()
182 	unsigned long pc;  in ptrace_set_bpt()  local
184 	pc  = get_reg(child, REG_PC);  in ptrace_set_bpt()
185 	res = read_int(child, pc, (int *) &insn);  in ptrace_set_bpt()
200 		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;  in ptrace_set_bpt()
202 			task_thread_info(child)->bpt_addr[nsaved++]  in ptrace_set_bpt()
203 			  = pc + 4 + displ;  in ptrace_set_bpt()
207 		task_thread_info(child)->bpt_addr[nsaved++] = get_reg(child, reg_b);  in ptrace_set_bpt()
210 		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;  in ptrace_set_bpt()
216 		res = read_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_set_bpt()
220 		task_thread_info(child)->bpt_insn[i] = insn;  in ptrace_set_bpt()
221 		DBG(DBG_BPT, ("    -> next_pc=%lx\n",  in ptrace_set_bpt()
222 			      task_thread_info(child)->bpt_addr[i]));  in ptrace_set_bpt()
223 		res = write_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_set_bpt()
228 	task_thread_info(child)->bpt_nsaved = nsaved;  in ptrace_set_bpt()
233  * Ensure no single-step breakpoint is pending.  Returns non-zero
234  * value if child was being single-stepped.
239 	int i, nsaved = task_thread_info(child)->bpt_nsaved;  in ptrace_cancel_bpt()
241 	task_thread_info(child)->bpt_nsaved = 0;  in ptrace_cancel_bpt()
249 		write_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_cancel_bpt()
250 			  task_thread_info(child)->bpt_insn[i]);  in ptrace_cancel_bpt()
258 	task_thread_info(child)->bpt_nsaved = -1;  in user_enable_single_step()
289 		ret = -EIO;  in arch_ptrace()
301 		DBG(DBG_MEM, ("peek $%lu->%#lx\n", addr, ret));  in arch_ptrace()
305 	case PTRACE_POKETEXT: /* write the word at location addr. */  in arch_ptrace()
310 	case PTRACE_POKEUSR: /* write the specified register */  in arch_ptrace()
311 		DBG(DBG_MEM, ("poke $%lu<-%#lx\n", addr, data));  in arch_ptrace()
327 		ret = -1UL;  in syscall_trace_enter()
328 	audit_syscall_entry(regs->r0, regs->r16, regs->r17, regs->r18, regs->r19);  in syscall_trace_enter()
329 	return ret ?: current_pt_regs()->r0;  in syscall_trace_enter()