1 // SPDX-License-Identifier: GPL-2.0
47  * Processes always block with the following stack-layout:
49  *  +================================+ <---- task + 2*PAGE_SIZE
50  *  | PALcode saved frame (ps, pc,   | ^
65  * which the register is saved.  Register indices are 0-31 for integer
66  * regs, 32-63 for fp regs, and 64 for the pc.  Notice that sp and
67  * zero have no stack-slot and need to be treated specially (see
75   (PAGE_SIZE*2 - sizeof(struct pt_regs) + offsetof(struct pt_regs, reg))
78  (PAGE_SIZE*2 - sizeof(struct pt_regs) - sizeof(struct switch_stack) \
91 	PT_REG(	  r28), PT_REG(	   gp),		   -1,		   -1,
100 	PT_REG(	   pc)
114 		addr = &task_thread_info(task)->pcb.usp;  in get_reg_addr()
116 		addr = &task_thread_info(task)->pcb.unique;  in get_reg_addr()
132 	/* Special hack for fpcr -- combine hardware and software bits.  */  in get_reg()
136 		  = task_thread_info(task)->ieee_state & IEEE_SW_MASK;  in get_reg()
144  * Write contents of register REGNO in task TASK.
150 		task_thread_info(task)->ieee_state  in put_reg()
151 		  = ((task_thread_info(task)->ieee_state & ~IEEE_SW_MASK)  in put_reg()
164 	return (copied == sizeof(int)) ? 0 : -EIO;  in read_int()
172 	return (copied == sizeof(int)) ? 0 : -EIO;  in write_int()
183 	unsigned long pc;  in ptrace_set_bpt()  local
185 	pc  = get_reg(child, REG_PC);  in ptrace_set_bpt()
186 	res = read_int(child, pc, (int *) &insn);  in ptrace_set_bpt()
201 		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;  in ptrace_set_bpt()
203 			task_thread_info(child)->bpt_addr[nsaved++]  in ptrace_set_bpt()
204 			  = pc + 4 + displ;  in ptrace_set_bpt()
208 		task_thread_info(child)->bpt_addr[nsaved++] = get_reg(child, reg_b);  in ptrace_set_bpt()
211 		task_thread_info(child)->bpt_addr[nsaved++] = pc + 4;  in ptrace_set_bpt()
217 		res = read_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_set_bpt()
221 		task_thread_info(child)->bpt_insn[i] = insn;  in ptrace_set_bpt()
222 		DBG(DBG_BPT, ("    -> next_pc=%lx\n",  in ptrace_set_bpt()
223 			      task_thread_info(child)->bpt_addr[i]));  in ptrace_set_bpt()
224 		res = write_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_set_bpt()
229 	task_thread_info(child)->bpt_nsaved = nsaved;  in ptrace_set_bpt()
234  * Ensure no single-step breakpoint is pending.  Returns non-zero
235  * value if child was being single-stepped.
240 	int i, nsaved = task_thread_info(child)->bpt_nsaved;  in ptrace_cancel_bpt()
242 	task_thread_info(child)->bpt_nsaved = 0;  in ptrace_cancel_bpt()
250 		write_int(child, task_thread_info(child)->bpt_addr[i],  in ptrace_cancel_bpt()
251 			  task_thread_info(child)->bpt_insn[i]);  in ptrace_cancel_bpt()
259 	task_thread_info(child)->bpt_nsaved = -1;  in user_enable_single_step()
290 		ret = -EIO;  in arch_ptrace()
302 		DBG(DBG_MEM, ("peek $%lu->%#lx\n", addr, ret));  in arch_ptrace()
306 	case PTRACE_POKETEXT: /* write the word at location addr. */  in arch_ptrace()
311 	case PTRACE_POKEUSR: /* write the specified register */  in arch_ptrace()
312 		DBG(DBG_MEM, ("poke $%lu<-%#lx\n", addr, data));  in arch_ptrace()
328 		ret = -1UL;  in syscall_trace_enter()
329 	audit_syscall_entry(regs->r0, regs->r16, regs->r17, regs->r18, regs->r19);  in syscall_trace_enter()
330 	return ret ?: current_pt_regs()->r0;  in syscall_trace_enter()