Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...

1 files changed, 0 insertions, 502 deletions

diff --git a/arch/mn10300/kernel/kgdb.c b/arch/mn10300/kernel/kgdb.c
deleted file mode 100644
index 2d7986c386fe..000000000000
--- a/arch/mn10300/kernel/kgdb.c
+++ /dev/null
@@ -1,502 +0,0 @@
-/* kgdb support for MN10300
- *
- * Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public Licence
- * as published by the Free Software Foundation; either version
- * 2 of the Licence, or (at your option) any later version.
- */
-
-#include <linux/slab.h>
-#include <linux/ptrace.h>
-#include <linux/kgdb.h>
-#include <linux/uaccess.h>
-#include <unit/leds.h>
-#include <unit/serial.h>
-#include <asm/debugger.h>
-#include <asm/serial-regs.h>
-#include "internal.h"
-
-/*
- * Software single-stepping breakpoint save (used by __switch_to())
- */
-static struct thread_info *kgdb_sstep_thread;
-u8 *kgdb_sstep_bp_addr[2];
-u8 kgdb_sstep_bp[2];
-
-/*
- * Copy kernel exception frame registers to the GDB register file
- */
-void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-	unsigned long ssp = (unsigned long) (regs + 1);
-
-	gdb_regs[GDB_FR_D0]	= regs->d0;
-	gdb_regs[GDB_FR_D1]	= regs->d1;
-	gdb_regs[GDB_FR_D2]	= regs->d2;
-	gdb_regs[GDB_FR_D3]	= regs->d3;
-	gdb_regs[GDB_FR_A0]	= regs->a0;
-	gdb_regs[GDB_FR_A1]	= regs->a1;
-	gdb_regs[GDB_FR_A2]	= regs->a2;
-	gdb_regs[GDB_FR_A3]	= regs->a3;
-	gdb_regs[GDB_FR_SP]	= (regs->epsw & EPSW_nSL) ? regs->sp : ssp;
-	gdb_regs[GDB_FR_PC]	= regs->pc;
-	gdb_regs[GDB_FR_MDR]	= regs->mdr;
-	gdb_regs[GDB_FR_EPSW]	= regs->epsw;
-	gdb_regs[GDB_FR_LIR]	= regs->lir;
-	gdb_regs[GDB_FR_LAR]	= regs->lar;
-	gdb_regs[GDB_FR_MDRQ]	= regs->mdrq;
-	gdb_regs[GDB_FR_E0]	= regs->e0;
-	gdb_regs[GDB_FR_E1]	= regs->e1;
-	gdb_regs[GDB_FR_E2]	= regs->e2;
-	gdb_regs[GDB_FR_E3]	= regs->e3;
-	gdb_regs[GDB_FR_E4]	= regs->e4;
-	gdb_regs[GDB_FR_E5]	= regs->e5;
-	gdb_regs[GDB_FR_E6]	= regs->e6;
-	gdb_regs[GDB_FR_E7]	= regs->e7;
-	gdb_regs[GDB_FR_SSP]	= ssp;
-	gdb_regs[GDB_FR_MSP]	= 0;
-	gdb_regs[GDB_FR_USP]	= regs->sp;
-	gdb_regs[GDB_FR_MCRH]	= regs->mcrh;
-	gdb_regs[GDB_FR_MCRL]	= regs->mcrl;
-	gdb_regs[GDB_FR_MCVF]	= regs->mcvf;
-	gdb_regs[GDB_FR_DUMMY0]	= 0;
-	gdb_regs[GDB_FR_DUMMY1]	= 0;
-	gdb_regs[GDB_FR_FS0]	= 0;
-}
-
-/*
- * Extracts kernel SP/PC values understandable by gdb from the values
- * saved by switch_to().
- */
-void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
-{
-	gdb_regs[GDB_FR_SSP]	= p->thread.sp;
-	gdb_regs[GDB_FR_PC]	= p->thread.pc;
-	gdb_regs[GDB_FR_A3]	= p->thread.a3;
-	gdb_regs[GDB_FR_USP]	= p->thread.usp;
-	gdb_regs[GDB_FR_FPCR]	= p->thread.fpu_state.fpcr;
-}
-
-/*
- * Fill kernel exception frame registers from the GDB register file
- */
-void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-	regs->d0	= gdb_regs[GDB_FR_D0];
-	regs->d1	= gdb_regs[GDB_FR_D1];
-	regs->d2	= gdb_regs[GDB_FR_D2];
-	regs->d3	= gdb_regs[GDB_FR_D3];
-	regs->a0	= gdb_regs[GDB_FR_A0];
-	regs->a1	= gdb_regs[GDB_FR_A1];
-	regs->a2	= gdb_regs[GDB_FR_A2];
-	regs->a3	= gdb_regs[GDB_FR_A3];
-	regs->sp	= gdb_regs[GDB_FR_SP];
-	regs->pc	= gdb_regs[GDB_FR_PC];
-	regs->mdr	= gdb_regs[GDB_FR_MDR];
-	regs->epsw	= gdb_regs[GDB_FR_EPSW];
-	regs->lir	= gdb_regs[GDB_FR_LIR];
-	regs->lar	= gdb_regs[GDB_FR_LAR];
-	regs->mdrq	= gdb_regs[GDB_FR_MDRQ];
-	regs->e0	= gdb_regs[GDB_FR_E0];
-	regs->e1	= gdb_regs[GDB_FR_E1];
-	regs->e2	= gdb_regs[GDB_FR_E2];
-	regs->e3	= gdb_regs[GDB_FR_E3];
-	regs->e4	= gdb_regs[GDB_FR_E4];
-	regs->e5	= gdb_regs[GDB_FR_E5];
-	regs->e6	= gdb_regs[GDB_FR_E6];
-	regs->e7	= gdb_regs[GDB_FR_E7];
-	regs->sp	= gdb_regs[GDB_FR_SSP];
-	/* gdb_regs[GDB_FR_MSP]; */
-	// regs->usp	= gdb_regs[GDB_FR_USP];
-	regs->mcrh	= gdb_regs[GDB_FR_MCRH];
-	regs->mcrl	= gdb_regs[GDB_FR_MCRL];
-	regs->mcvf	= gdb_regs[GDB_FR_MCVF];
-	/* gdb_regs[GDB_FR_DUMMY0]; */
-	/* gdb_regs[GDB_FR_DUMMY1]; */
-
-	// regs->fpcr	= gdb_regs[GDB_FR_FPCR];
-	// regs->fs0	= gdb_regs[GDB_FR_FS0];
-}
-
-struct kgdb_arch arch_kgdb_ops = {
-	.gdb_bpt_instr	= { 0xff },
-	.flags		= KGDB_HW_BREAKPOINT,
-};
-
-static const unsigned char mn10300_kgdb_insn_sizes[256] =
-{
-	/* 1  2  3  4  5  6  7  8  9  a  b  c  d  e  f */
-	1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3, 1, 3, 3, 3,	/* 0 */
-	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 1 */
-	2, 2, 2, 2, 3, 3, 3, 3, 2, 2, 2, 2, 3, 3, 3, 3, /* 2 */
-	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, /* 3 */
-	1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, /* 4 */
-	1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, /* 5 */
-	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 6 */
-	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 7 */
-	2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 8 */
-	2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* 9 */
-	2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* a */
-	2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, /* b */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 2, /* c */
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* d */
-	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* e */
-	0, 2, 2, 2, 2, 2, 2, 4, 0, 3, 0, 4, 0, 6, 7, 1  /* f */
-};
-
-/*
- * Attempt to emulate single stepping by means of breakpoint instructions.
- * Although there is a single-step trace flag in EPSW, its use is not
- * sufficiently documented and is only intended for use with the JTAG debugger.
- */
-static int kgdb_arch_do_singlestep(struct pt_regs *regs)
-{
-	unsigned long arg;
-	unsigned size;
-	u8 *pc = (u8 *)regs->pc, *sp = (u8 *)(regs + 1), cur;
-	u8 *x = NULL, *y = NULL;
-	int ret;
-
-	ret = probe_kernel_read(&cur, pc, 1);
-	if (ret < 0)
-		return ret;
-
-	size = mn10300_kgdb_insn_sizes[cur];
-	if (size > 0) {
-		x = pc + size;
-		goto set_x;
-	}
-
-	switch (cur) {
-		/* Bxx (d8,PC) */
-	case 0xc0 ... 0xca:
-		ret = probe_kernel_read(&arg, pc + 1, 1);
-		if (ret < 0)
-			return ret;
-		x = pc + 2;
-		if (arg >= 0 && arg <= 2)
-			goto set_x;
-		y = pc + (s8)arg;
-		goto set_x_and_y;
-
-		/* LXX (d8,PC) */
-	case 0xd0 ... 0xda:
-		x = pc + 1;
-		if (regs->pc == regs->lar)
-			goto set_x;
-		y = (u8 *)regs->lar;
-		goto set_x_and_y;
-
-		/* SETLB - loads the next four bytes into the LIR register
-		 * (which mustn't include a breakpoint instruction) */
-	case 0xdb:
-		x = pc + 5;
-		goto set_x;
-
-		/* JMP (d16,PC) or CALL (d16,PC) */
-	case 0xcc:
-	case 0xcd:
-		ret = probe_kernel_read(&arg, pc + 1, 2);
-		if (ret < 0)
-			return ret;
-		x = pc + (s16)arg;
-		goto set_x;
-
-		/* JMP (d32,PC) or CALL (d32,PC) */
-	case 0xdc:
-	case 0xdd:
-		ret = probe_kernel_read(&arg, pc + 1, 4);
-		if (ret < 0)
-			return ret;
-		x = pc + (s32)arg;
-		goto set_x;
-
-		/* RETF */
-	case 0xde:
-		x = (u8 *)regs->mdr;
-		goto set_x;
-
-		/* RET */
-	case 0xdf:
-		ret = probe_kernel_read(&arg, pc + 2, 1);
-		if (ret < 0)
-			return ret;
-		ret = probe_kernel_read(&x, sp + (s8)arg, 4);
-		if (ret < 0)
-			return ret;
-		goto set_x;
-
-	case 0xf0:
-		ret = probe_kernel_read(&cur, pc + 1, 1);
-		if (ret < 0)
-			return ret;
-
-		if (cur >= 0xf0 && cur <= 0xf7) {
-			/* JMP (An) / CALLS (An) */
-			switch (cur & 3) {
-			case 0: x = (u8 *)regs->a0; break;
-			case 1: x = (u8 *)regs->a1; break;
-			case 2: x = (u8 *)regs->a2; break;
-			case 3: x = (u8 *)regs->a3; break;
-			}
-			goto set_x;
-		} else if (cur == 0xfc) {
-			/* RETS */
-			ret = probe_kernel_read(&x, sp, 4);
-			if (ret < 0)
-				return ret;
-			goto set_x;
-		} else if (cur == 0xfd) {
-			/* RTI */
-			ret = probe_kernel_read(&x, sp + 4, 4);
-			if (ret < 0)
-				return ret;
-			goto set_x;
-		} else {
-			x = pc + 2;
-			goto set_x;
-		}
-		break;
-
-		/* potential 3-byte conditional branches */
-	case 0xf8:
-		ret = probe_kernel_read(&cur, pc + 1, 1);
-		if (ret < 0)
-			return ret;
-		x = pc + 3;
-
-		if (cur >= 0xe8 && cur <= 0xeb) {
-			ret = probe_kernel_read(&arg, pc + 2, 1);
-			if (ret < 0)
-				return ret;
-			if (arg >= 0 && arg <= 3)
-				goto set_x;
-			y = pc + (s8)arg;
-			goto set_x_and_y;
-		}
-		goto set_x;
-
-	case 0xfa:
-		ret = probe_kernel_read(&cur, pc + 1, 1);
-		if (ret < 0)
-			return ret;
-
-		if (cur == 0xff) {
-			/* CALLS (d16,PC) */
-			ret = probe_kernel_read(&arg, pc + 2, 2);
-			if (ret < 0)
-				return ret;
-			x = pc + (s16)arg;
-			goto set_x;
-		}
-
-		x = pc + 4;
-		goto set_x;
-
-	case 0xfc:
-		ret = probe_kernel_read(&cur, pc + 1, 1);
-		if (ret < 0)
-			return ret;
-
-		if (cur == 0xff) {
-			/* CALLS (d32,PC) */
-			ret = probe_kernel_read(&arg, pc + 2, 4);
-			if (ret < 0)
-				return ret;
-			x = pc + (s32)arg;
-			goto set_x;
-		}
-
-		x = pc + 6;
-		goto set_x;
-	}
-
-	return 0;
-
-set_x:
-	kgdb_sstep_bp_addr[0] = x;
-	kgdb_sstep_bp_addr[1] = NULL;
-	ret = probe_kernel_read(&kgdb_sstep_bp[0], x, 1);
-	if (ret < 0)
-		return ret;
-	ret = probe_kernel_write(x, &arch_kgdb_ops.gdb_bpt_instr, 1);
-	if (ret < 0)
-		return ret;
-	kgdb_sstep_thread = current_thread_info();
-	debugger_local_cache_flushinv_one(x);
-	return ret;
-
-set_x_and_y:
-	kgdb_sstep_bp_addr[0] = x;
-	kgdb_sstep_bp_addr[1] = y;
-	ret = probe_kernel_read(&kgdb_sstep_bp[0], x, 1);
-	if (ret < 0)
-		return ret;
-	ret = probe_kernel_read(&kgdb_sstep_bp[1], y, 1);
-	if (ret < 0)
-		return ret;
-	ret = probe_kernel_write(x, &arch_kgdb_ops.gdb_bpt_instr, 1);
-	if (ret < 0)
-		return ret;
-	ret = probe_kernel_write(y, &arch_kgdb_ops.gdb_bpt_instr, 1);
-	if (ret < 0) {
-		probe_kernel_write(kgdb_sstep_bp_addr[0],
-				   &kgdb_sstep_bp[0], 1);
-	} else {
-		kgdb_sstep_thread = current_thread_info();
-	}
-	debugger_local_cache_flushinv_one(x);
-	debugger_local_cache_flushinv_one(y);
-	return ret;
-}
-
-/*
- * Remove emplaced single-step breakpoints, returning true if we hit one of
- * them.
- */
-static bool kgdb_arch_undo_singlestep(struct pt_regs *regs)
-{
-	bool hit = false;
-	u8 *x = kgdb_sstep_bp_addr[0], *y = kgdb_sstep_bp_addr[1];
-	u8 opcode;
-
-	if (kgdb_sstep_thread == current_thread_info()) {
-		if (x) {
-			if (x == (u8 *)regs->pc)
-				hit = true;
-			if (probe_kernel_read(&opcode, x,
-					      1) < 0 ||
-			    opcode != 0xff)
-				BUG();
-			probe_kernel_write(x, &kgdb_sstep_bp[0], 1);
-			debugger_local_cache_flushinv_one(x);
-		}
-		if (y) {
-			if (y == (u8 *)regs->pc)
-				hit = true;
-			if (probe_kernel_read(&opcode, y,
-					      1) < 0 ||
-			    opcode != 0xff)
-				BUG();
-			probe_kernel_write(y, &kgdb_sstep_bp[1], 1);
-			debugger_local_cache_flushinv_one(y);
-		}
-	}
-
-	kgdb_sstep_bp_addr[0] = NULL;
-	kgdb_sstep_bp_addr[1] = NULL;
-	kgdb_sstep_thread = NULL;
-	return hit;
-}
-
-/*
- * Catch a single-step-pending thread being deleted and make sure the global
- * single-step state is cleared.  At this point the breakpoints should have
- * been removed by __switch_to().
- */
-void arch_release_thread_stack(unsigned long *stack)
-{
-	struct thread_info *ti = (void *)stack;
-	if (kgdb_sstep_thread == ti) {
-		kgdb_sstep_thread = NULL;
-
-		/* However, we may now be running in degraded mode, with most
-		 * of the CPUs disabled until such a time as KGDB is reentered,
-		 * so force immediate reentry */
-		kgdb_breakpoint();
-	}
-}
-
-/*
- * Handle unknown packets and [CcsDk] packets
- * - at this point breakpoints have been installed
- */
-int kgdb_arch_handle_exception(int vector, int signo, int err_code,
-			       char *remcom_in_buffer, char *remcom_out_buffer,
-			       struct pt_regs *regs)
-{
-	long addr;
-	char *ptr;
-
-	switch (remcom_in_buffer[0]) {
-	case 'c':
-	case 's':
-		/* try to read optional parameter, pc unchanged if no parm */
-		ptr = &remcom_in_buffer[1];
-		if (kgdb_hex2long(&ptr, &addr))
-			regs->pc = addr;
-	case 'D':
-	case 'k':
-		atomic_set(&kgdb_cpu_doing_single_step, -1);
-
-		if (remcom_in_buffer[0] == 's') {
-			kgdb_arch_do_singlestep(regs);
-			kgdb_single_step = 1;
-			atomic_set(&kgdb_cpu_doing_single_step,
-				   raw_smp_processor_id());
-		}
-		return 0;
-	}
-	return -1; /* this means that we do not want to exit from the handler */
-}
-
-/*
- * Handle event interception
- * - returns 0 if the exception should be skipped, -ERROR otherwise.
- */
-int debugger_intercept(enum exception_code excep, int signo, int si_code,
-		       struct pt_regs *regs)
-{
-	int ret;
-
-	if (kgdb_arch_undo_singlestep(regs)) {
-		excep = EXCEP_TRAP;
-		signo = SIGTRAP;
-		si_code = TRAP_TRACE;
-	}
-
-	ret = kgdb_handle_exception(excep, signo, si_code, regs);
-
-	debugger_local_cache_flushinv();
-
-	return ret;
-}
-
-/*
- * Determine if we've hit a debugger special breakpoint
- */
-int at_debugger_breakpoint(struct pt_regs *regs)
-{
-	return regs->pc == (unsigned long)&__arch_kgdb_breakpoint;
-}
-
-/*
- * Initialise kgdb
- */
-int kgdb_arch_init(void)
-{
-	return 0;
-}
-
-/*
- * Do something, perhaps, but don't know what.
- */
-void kgdb_arch_exit(void)
-{
-}
-
-#ifdef CONFIG_SMP
-void debugger_nmi_interrupt(struct pt_regs *regs, enum exception_code code)
-{
-	kgdb_nmicallback(arch_smp_processor_id(), regs);
-	debugger_local_cache_flushinv();
-}
-
-void kgdb_roundup_cpus(unsigned long flags)
-{
-	smp_jump_to_debugger();
-}
-#endif