arch: remove m32r port

The Mitsubishi/Renesas m32r architecture has been around for many years,
but the Linux port has been obsolete for a very long time as well, with
the last significant updates done for linux-2.6.14.

While some m32r microcontrollers are still being marketed by Renesas,
those are apparently no longer possible to support, mainly due to the
lack of an external memory interface.

Hirokazu Takata was the maintainer until the architecture got marked
Orphaned in 2014.

Link: http://www.linux-m32r.org/
Link: https://www.renesas.com/en-eu/products/microcontrollers-microprocessors/m32r.html
Cc: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 708 deletions

diff --git a/arch/m32r/kernel/ptrace.c b/arch/m32r/kernel/ptrace.c
deleted file mode 100644
index d702a5ca0f92..000000000000
--- a/arch/m32r/kernel/ptrace.c
+++ /dev/null
@@ -1,708 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/arch/m32r/kernel/ptrace.c
- *
- * Copyright (C) 2002  Hirokazu Takata, Takeo Takahashi
- * Copyright (C) 2004  Hirokazu Takata, Kei Sakamoto
- *
- * Original x86 implementation:
- *	By Ross Biro 1/23/92
- *	edited by Linus Torvalds
- *
- * Some code taken from sh version:
- *   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
- * Some code taken from arm version:
- *   Copyright (C) 2000 Russell King
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/err.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/ptrace.h>
-#include <linux/user.h>
-#include <linux/string.h>
-#include <linux/signal.h>
-
-#include <asm/cacheflush.h>
-#include <asm/io.h>
-#include <linux/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/processor.h>
-#include <asm/mmu_context.h>
-
-/*
- * This routine will get a word off of the process kernel stack.
- */
-static inline unsigned long int
-get_stack_long(struct task_struct *task, int offset)
-{
-	unsigned long *stack;
-
-	stack = (unsigned long *)task_pt_regs(task);
-
-	return stack[offset];
-}
-
-/*
- * This routine will put a word on the process kernel stack.
- */
-static inline int
-put_stack_long(struct task_struct *task, int offset, unsigned long data)
-{
-	unsigned long *stack;
-
-	stack = (unsigned long *)task_pt_regs(task);
-	stack[offset] = data;
-
-	return 0;
-}
-
-static int reg_offset[] = {
-	PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
-	PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
-};
-
-/*
- * Read the word at offset "off" into the "struct user".  We
- * actually access the pt_regs stored on the kernel stack.
- */
-static int ptrace_read_user(struct task_struct *tsk, unsigned long off,
-			    unsigned long __user *data)
-{
-	unsigned long tmp;
-#ifndef NO_FPU
-	struct user * dummy = NULL;
-#endif
-
-	if ((off & 3) || off > sizeof(struct user) - 3)
-		return -EIO;
-
-	off >>= 2;
-	switch (off) {
-	case PT_EVB:
-		__asm__ __volatile__ (
-			"mvfc	%0, cr5 \n\t"
-	 		: "=r" (tmp)
-		);
-		break;
-	case PT_CBR: {
-			unsigned long psw;
-			psw = get_stack_long(tsk, PT_PSW);
-			tmp = ((psw >> 8) & 1);
-		}
-		break;
-	case PT_PSW: {
-			unsigned long psw, bbpsw;
-			psw = get_stack_long(tsk, PT_PSW);
-			bbpsw = get_stack_long(tsk, PT_BBPSW);
-			tmp = ((psw >> 8) & 0xff) | ((bbpsw & 0xff) << 8);
-		}
-		break;
-	case PT_PC:
-		tmp = get_stack_long(tsk, PT_BPC);
-		break;
-	case PT_BPC:
-		off = PT_BBPC;
-		/* fall through */
-	default:
-		if (off < (sizeof(struct pt_regs) >> 2))
-			tmp = get_stack_long(tsk, off);
-#ifndef NO_FPU
-		else if (off >= (long)(&dummy->fpu >> 2) &&
-			 off < (long)(&dummy->u_fpvalid >> 2)) {
-			if (!tsk_used_math(tsk)) {
-				if (off == (long)(&dummy->fpu.fpscr >> 2))
-					tmp = FPSCR_INIT;
-				else
-					tmp = 0;
-			} else
-				tmp = ((long *)(&tsk->thread.fpu >> 2))
-					[off - (long)&dummy->fpu];
-		} else if (off == (long)(&dummy->u_fpvalid >> 2))
-			tmp = !!tsk_used_math(tsk);
-#endif /* not NO_FPU */
-		else
-			tmp = 0;
-	}
-
-	return put_user(tmp, data);
-}
-
-static int ptrace_write_user(struct task_struct *tsk, unsigned long off,
-			     unsigned long data)
-{
-	int ret = -EIO;
-#ifndef NO_FPU
-	struct user * dummy = NULL;
-#endif
-
-	if ((off & 3) || off > sizeof(struct user) - 3)
-		return -EIO;
-
-	off >>= 2;
-	switch (off) {
-	case PT_EVB:
-	case PT_BPC:
-	case PT_SPI:
-		/* We don't allow to modify evb. */
-		ret = 0;
-		break;
-	case PT_PSW:
-	case PT_CBR: {
-			/* We allow to modify only cbr in psw */
-			unsigned long psw;
-			psw = get_stack_long(tsk, PT_PSW);
-			psw = (psw & ~0x100) | ((data & 1) << 8);
-			ret = put_stack_long(tsk, PT_PSW, psw);
-		}
-		break;
-	case PT_PC:
-		off = PT_BPC;
-		data &= ~1;
-		/* fall through */
-	default:
-		if (off < (sizeof(struct pt_regs) >> 2))
-			ret = put_stack_long(tsk, off, data);
-#ifndef NO_FPU
-		else if (off >= (long)(&dummy->fpu >> 2) &&
-			 off < (long)(&dummy->u_fpvalid >> 2)) {
-			set_stopped_child_used_math(tsk);
-			((long *)&tsk->thread.fpu)
-				[off - (long)&dummy->fpu] = data;
-			ret = 0;
-		} else if (off == (long)(&dummy->u_fpvalid >> 2)) {
-			conditional_stopped_child_used_math(data, tsk);
-			ret = 0;
-		}
-#endif /* not NO_FPU */
-		break;
-	}
-
-	return ret;
-}
-
-/*
- * Get all user integer registers.
- */
-static int ptrace_getregs(struct task_struct *tsk, void __user *uregs)
-{
-	struct pt_regs *regs = task_pt_regs(tsk);
-
-	return copy_to_user(uregs, regs, sizeof(struct pt_regs)) ? -EFAULT : 0;
-}
-
-/*
- * Set all user integer registers.
- */
-static int ptrace_setregs(struct task_struct *tsk, void __user *uregs)
-{
-	struct pt_regs newregs;
-	int ret;
-
-	ret = -EFAULT;
-	if (copy_from_user(&newregs, uregs, sizeof(struct pt_regs)) == 0) {
-		struct pt_regs *regs = task_pt_regs(tsk);
-		*regs = newregs;
-		ret = 0;
-	}
-
-	return ret;
-}
-
-
-static inline int
-check_condition_bit(struct task_struct *child)
-{
-	return (int)((get_stack_long(child, PT_PSW) >> 8) & 1);
-}
-
-static int
-check_condition_src(unsigned long op, unsigned long regno1,
-		    unsigned long regno2, struct task_struct *child)
-{
-	unsigned long reg1, reg2;
-
-	reg2 = get_stack_long(child, reg_offset[regno2]);
-
-	switch (op) {
-	case 0x0: /* BEQ */
-		reg1 = get_stack_long(child, reg_offset[regno1]);
-		return reg1 == reg2;
-	case 0x1: /* BNE */
-		reg1 = get_stack_long(child, reg_offset[regno1]);
-		return reg1 != reg2;
-	case 0x8: /* BEQZ */
-		return reg2 == 0;
-	case 0x9: /* BNEZ */
-		return reg2 != 0;
-	case 0xa: /* BLTZ */
-		return (int)reg2 < 0;
-	case 0xb: /* BGEZ */
-		return (int)reg2 >= 0;
-	case 0xc: /* BLEZ */
-		return (int)reg2 <= 0;
-	case 0xd: /* BGTZ */
-		return (int)reg2 > 0;
-	default:
-		/* never reached */
-		return 0;
-	}
-}
-
-static void
-compute_next_pc_for_16bit_insn(unsigned long insn, unsigned long pc,
-			       unsigned long *next_pc,
-			       struct task_struct *child)
-{
-	unsigned long op, op2, op3;
-	unsigned long disp;
-	unsigned long regno;
-	int parallel = 0;
-
-	if (insn & 0x00008000)
-		parallel = 1;
-	if (pc & 3)
-		insn &= 0x7fff;	/* right slot */
-	else
-		insn >>= 16;	/* left slot */
-
-	op = (insn >> 12) & 0xf;
-	op2 = (insn >> 8) & 0xf;
-	op3 = (insn >> 4) & 0xf;
-
-	if (op == 0x7) {
-		switch (op2) {
-		case 0xd: /* BNC */
-		case 0x9: /* BNCL */
-			if (!check_condition_bit(child)) {
-				disp = (long)(insn << 24) >> 22;
-				*next_pc = (pc & ~0x3) + disp;
-				return;
-			}
-			break;
-		case 0x8: /* BCL */
-		case 0xc: /* BC */
-			if (check_condition_bit(child)) {
-				disp = (long)(insn << 24) >> 22;
-				*next_pc = (pc & ~0x3) + disp;
-				return;
-			}
-			break;
-		case 0xe: /* BL */
-		case 0xf: /* BRA */
-			disp = (long)(insn << 24) >> 22;
-			*next_pc = (pc & ~0x3) + disp;
-			return;
-			break;
-		}
-	} else if (op == 0x1) {
-		switch (op2) {
-		case 0x0:
-			if (op3 == 0xf) { /* TRAP */
-#if 1
-				/* pass through */
-#else
- 				/* kernel space is not allowed as next_pc */
-				unsigned long evb;
-				unsigned long trapno;
-				trapno = insn & 0xf;
-				__asm__ __volatile__ (
-					"mvfc %0, cr5\n"
-		 			:"=r"(evb)
-		 			:
-				);
-				*next_pc = evb + (trapno << 2);
-				return;
-#endif
-			} else if (op3 == 0xd) { /* RTE */
-				*next_pc = get_stack_long(child, PT_BPC);
-				return;
-			}
-			break;
-		case 0xc: /* JC */
-			if (op3 == 0xc && check_condition_bit(child)) {
-				regno = insn & 0xf;
-				*next_pc = get_stack_long(child,
-							  reg_offset[regno]);
-				return;
-			}
-			break;
-		case 0xd: /* JNC */
-			if (op3 == 0xc && !check_condition_bit(child)) {
-				regno = insn & 0xf;
-				*next_pc = get_stack_long(child,
-							  reg_offset[regno]);
-				return;
-			}
-			break;
-		case 0xe: /* JL */
-		case 0xf: /* JMP */
-			if (op3 == 0xc) { /* JMP */
-				regno = insn & 0xf;
-				*next_pc = get_stack_long(child,
-							  reg_offset[regno]);
-				return;
-			}
-			break;
-		}
-	}
-	if (parallel)
-		*next_pc = pc + 4;
-	else
-		*next_pc = pc + 2;
-}
-
-static void
-compute_next_pc_for_32bit_insn(unsigned long insn, unsigned long pc,
-			       unsigned long *next_pc,
-			       struct task_struct *child)
-{
-	unsigned long op;
-	unsigned long op2;
-	unsigned long disp;
-	unsigned long regno1, regno2;
-
-	op = (insn >> 28) & 0xf;
-	if (op == 0xf) { 	/* branch 24-bit relative */
-		op2 = (insn >> 24) & 0xf;
-		switch (op2) {
-		case 0xd:	/* BNC */
-		case 0x9:	/* BNCL */
-			if (!check_condition_bit(child)) {
-				disp = (long)(insn << 8) >> 6;
-				*next_pc = (pc & ~0x3) + disp;
-				return;
-			}
-			break;
-		case 0x8:	/* BCL */
-		case 0xc:	/* BC */
-			if (check_condition_bit(child)) {
-				disp = (long)(insn << 8) >> 6;
-				*next_pc = (pc & ~0x3) + disp;
-				return;
-			}
-			break;
-		case 0xe:	/* BL */
-		case 0xf:	/* BRA */
-			disp = (long)(insn << 8) >> 6;
-			*next_pc = (pc & ~0x3) + disp;
-			return;
-		}
-	} else if (op == 0xb) { /* branch 16-bit relative */
-		op2 = (insn >> 20) & 0xf;
-		switch (op2) {
-		case 0x0: /* BEQ */
-		case 0x1: /* BNE */
-		case 0x8: /* BEQZ */
-		case 0x9: /* BNEZ */
-		case 0xa: /* BLTZ */
-		case 0xb: /* BGEZ */
-		case 0xc: /* BLEZ */
-		case 0xd: /* BGTZ */
-			regno1 = ((insn >> 24) & 0xf);
-			regno2 = ((insn >> 16) & 0xf);
-			if (check_condition_src(op2, regno1, regno2, child)) {
-				disp = (long)(insn << 16) >> 14;
-				*next_pc = (pc & ~0x3) + disp;
-				return;
-			}
-			break;
-		}
-	}
-	*next_pc = pc + 4;
-}
-
-static inline void
-compute_next_pc(unsigned long insn, unsigned long pc,
-		unsigned long *next_pc, struct task_struct *child)
-{
-	if (insn & 0x80000000)
-		compute_next_pc_for_32bit_insn(insn, pc, next_pc, child);
-	else
-		compute_next_pc_for_16bit_insn(insn, pc, next_pc, child);
-}
-
-static int
-register_debug_trap(struct task_struct *child, unsigned long next_pc,
-	unsigned long next_insn, unsigned long *code)
-{
-	struct debug_trap *p = &child->thread.debug_trap;
-	unsigned long addr = next_pc & ~3;
-
-	if (p->nr_trap == MAX_TRAPS) {
-		printk("kernel BUG at %s %d: p->nr_trap = %d\n",
-					__FILE__, __LINE__, p->nr_trap);
-		return -1;
-	}
-	p->addr[p->nr_trap] = addr;
-	p->insn[p->nr_trap] = next_insn;
-	p->nr_trap++;
-	if (next_pc & 3) {
-		*code = (next_insn & 0xffff0000) | 0x10f1;
-		/* xxx --> TRAP1 */
-	} else {
-		if ((next_insn & 0x80000000) || (next_insn & 0x8000)) {
-			*code = 0x10f17000;
-			/* TRAP1 --> NOP */
-		} else {
-			*code = (next_insn & 0xffff) | 0x10f10000;
-			/* TRAP1 --> xxx */
-		}
-	}
-	return 0;
-}
-
-static int
-unregister_debug_trap(struct task_struct *child, unsigned long addr,
-		      unsigned long *code)
-{
-	struct debug_trap *p = &child->thread.debug_trap;
-        int i;
-
-	/* Search debug trap entry. */
-	for (i = 0; i < p->nr_trap; i++) {
-		if (p->addr[i] == addr)
-			break;
-	}
-	if (i >= p->nr_trap) {
-		/* The trap may be requested from debugger.
-		 * ptrace should do nothing in this case.
-		 */
-		return 0;
-	}
-
-	/* Recover original instruction code. */
-	*code = p->insn[i];
-
-	/* Shift debug trap entries. */
-	while (i < p->nr_trap - 1) {
-		p->insn[i] = p->insn[i + 1];
-		p->addr[i] = p->addr[i + 1];
-		i++;
-	}
-	p->nr_trap--;
-	return 1;
-}
-
-static void
-unregister_all_debug_traps(struct task_struct *child)
-{
-	struct debug_trap *p = &child->thread.debug_trap;
-	int i;
-
-	for (i = 0; i < p->nr_trap; i++)
-		access_process_vm(child, p->addr[i], &p->insn[i], sizeof(p->insn[i]),
-				FOLL_FORCE | FOLL_WRITE);
-	p->nr_trap = 0;
-}
-
-static inline void
-invalidate_cache(void)
-{
-#if defined(CONFIG_CHIP_M32700) || defined(CONFIG_CHIP_OPSP)
-
-	_flush_cache_copyback_all();
-
-#else	/* ! CONFIG_CHIP_M32700 */
-
-	/* Invalidate cache */
-	__asm__ __volatile__ (
-                "ldi    r0, #-1					\n\t"
-                "ldi    r1, #0					\n\t"
-                "stb    r1, @r0		; cache off		\n\t"
-                ";						\n\t"
-                "ldi    r0, #-2					\n\t"
-                "ldi    r1, #1					\n\t"
-                "stb    r1, @r0		; cache invalidate	\n\t"
-                ".fillinsn					\n"
-                "0:						\n\t"
-                "ldb    r1, @r0		; invalidate check	\n\t"
-                "bnez   r1, 0b					\n\t"
-                ";						\n\t"
-                "ldi    r0, #-1					\n\t"
-                "ldi    r1, #1					\n\t"
-                "stb    r1, @r0		; cache on		\n\t"
-		: : : "r0", "r1", "memory"
-	);
-	/* FIXME: copying-back d-cache and invalidating i-cache are needed.
-	 */
-#endif	/* CONFIG_CHIP_M32700 */
-}
-
-/* Embed a debug trap (TRAP1) code */
-static int
-embed_debug_trap(struct task_struct *child, unsigned long next_pc)
-{
-	unsigned long next_insn, code;
-	unsigned long addr = next_pc & ~3;
-
-	if (access_process_vm(child, addr, &next_insn, sizeof(next_insn),
-			FOLL_FORCE)
-	    != sizeof(next_insn)) {
-		return -1; /* error */
-	}
-
-	/* Set a trap code. */
-	if (register_debug_trap(child, next_pc, next_insn, &code)) {
-		return -1; /* error */
-	}
-	if (access_process_vm(child, addr, &code, sizeof(code),
-			FOLL_FORCE | FOLL_WRITE)
-	    != sizeof(code)) {
-		return -1; /* error */
-	}
-	return 0; /* success */
-}
-
-void
-withdraw_debug_trap(struct pt_regs *regs)
-{
-	unsigned long addr;
-	unsigned long code;
-
- 	addr = (regs->bpc - 2) & ~3;
-	regs->bpc -= 2;
-	if (unregister_debug_trap(current, addr, &code)) {
-	    access_process_vm(current, addr, &code, sizeof(code),
-		    FOLL_FORCE | FOLL_WRITE);
-	    invalidate_cache();
-	}
-}
-
-void
-init_debug_traps(struct task_struct *child)
-{
-	struct debug_trap *p = &child->thread.debug_trap;
-	int i;
-	p->nr_trap = 0;
-	for (i = 0; i < MAX_TRAPS; i++) {
-		p->addr[i] = 0;
-		p->insn[i] = 0;
-	}
-}
-
-void user_enable_single_step(struct task_struct *child)
-{
-	unsigned long next_pc;
-	unsigned long pc, insn;
-
-	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
-
-	/* Compute next pc.  */
-	pc = get_stack_long(child, PT_BPC);
-
-	if (access_process_vm(child, pc&~3, &insn, sizeof(insn),
-			FOLL_FORCE)
-	    != sizeof(insn))
-		return;
-
-	compute_next_pc(insn, pc, &next_pc, child);
-	if (next_pc & 0x80000000)
-		return;
-
-	if (embed_debug_trap(child, next_pc))
-		return;
-
-	invalidate_cache();
-}
-
-void user_disable_single_step(struct task_struct *child)
-{
-	unregister_all_debug_traps(child);
-	invalidate_cache();
-}
-
-/*
- * Called by kernel/ptrace.c when detaching..
- *
- * Make sure single step bits etc are not set.
- */
-void ptrace_disable(struct task_struct *child)
-{
-	/* nothing to do.. */
-}
-
-long
-arch_ptrace(struct task_struct *child, long request,
-	    unsigned long addr, unsigned long data)
-{
-	int ret;
-	unsigned long __user *datap = (unsigned long __user *) data;
-
-	switch (request) {
-	/*
-	 * read word at location "addr" in the child process.
-	 */
-	case PTRACE_PEEKTEXT:
-	case PTRACE_PEEKDATA:
-		ret = generic_ptrace_peekdata(child, addr, data);
-		break;
-
-	/*
-	 * read the word at location addr in the USER area.
-	 */
-	case PTRACE_PEEKUSR:
-		ret = ptrace_read_user(child, addr, datap);
-		break;
-
-	/*
-	 * write the word at location addr.
-	 */
-	case PTRACE_POKETEXT:
-	case PTRACE_POKEDATA:
-		ret = generic_ptrace_pokedata(child, addr, data);
-		if (ret == 0 && request == PTRACE_POKETEXT)
-			invalidate_cache();
-		break;
-
-	/*
-	 * write the word at location addr in the USER area.
-	 */
-	case PTRACE_POKEUSR:
-		ret = ptrace_write_user(child, addr, data);
-		break;
-
-	case PTRACE_GETREGS:
-		ret = ptrace_getregs(child, datap);
-		break;
-
-	case PTRACE_SETREGS:
-		ret = ptrace_setregs(child, datap);
-		break;
-
-	default:
-		ret = ptrace_request(child, request, addr, data);
-		break;
-	}
-
-	return ret;
-}
-
-/* notification of system call entry/exit
- * - triggered by current->work.syscall_trace
- */
-void do_syscall_trace(void)
-{
-	if (!test_thread_flag(TIF_SYSCALL_TRACE))
-		return;
-	if (!(current->ptrace & PT_PTRACED))
-		return;
-	/* the 0x80 provides a way for the tracing parent to distinguish
-	   between a syscall stop and SIGTRAP delivery */
-	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-				 ? 0x80 : 0));
-
-	/*
-	 * this isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
-	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
-}