disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/arch/arm/kernel/unwind.c
..
..
@@ -1,21 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * arch/arm/kernel/unwind.c
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  *
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  * Copyright (C) 2008 ARM Limited
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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- *
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  *
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  * Stack unwinding support for ARM
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  *
..
..
@@ -313,6 +300,29 @@
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 	return URC_OK;
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 }
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302
 
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+static unsigned long unwind_decode_uleb128(struct unwind_ctrl_block *ctrl)
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+{
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+	unsigned long bytes = 0;
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+	unsigned long insn;
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+	unsigned long result = 0;
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+
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+	/*
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+	 * unwind_get_byte() will advance `ctrl` one instruction at a time, so
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+	 * loop until we get an instruction byte where bit 7 is not set.
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+	 *
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+	 * Note: This decodes a maximum of 4 bytes to output 28 bits data where
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+	 * max is 0xfffffff: that will cover a vsp increment of 1073742336, hence
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+	 * it is sufficient for unwinding the stack.
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+	 */
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+	do {
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+		insn = unwind_get_byte(ctrl);
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+		result |= (insn & 0x7f) << (bytes * 7);
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+		bytes++;
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+	} while (!!(insn & 0x80) && (bytes != sizeof(result)));
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+
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+	return result;
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+}
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+
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 /*
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  * Execute the current unwind instruction.
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  */
..
..
@@ -366,7 +376,7 @@
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 		if (ret)
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 			goto error;
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 	} else if (insn == 0xb2) {
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-		unsigned long uleb128 = unwind_get_byte(ctrl);
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+		unsigned long uleb128 = unwind_decode_uleb128(ctrl);
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 		ctrl->vrs[SP] += 0x204 + (uleb128 << 2);
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 	} else {
..
..
@@ -457,7 +467,7 @@
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 		ctrl.vrs[PC] = ctrl.vrs[LR];
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468
 
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 	/* check for infinite loop */
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-	if (frame->pc == ctrl.vrs[PC])
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+	if (frame->pc == ctrl.vrs[PC] && frame->sp == ctrl.vrs[SP])
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 		return -URC_FAILURE;
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472
 
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 	frame->fp = ctrl.vrs[FP];
..
..
@@ -468,7 +478,8 @@
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 	return URC_OK;
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 }
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-void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk)
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+void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk,
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+		      const char *loglvl)
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 {
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 	struct stackframe frame;
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..
..
@@ -506,7 +517,7 @@
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 		urc = unwind_frame(&frame);
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 		if (urc < 0)
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 			break;
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-		dump_backtrace_entry(where, frame.pc, frame.sp - 4);
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+		dump_backtrace_entry(where, frame.pc, frame.sp - 4, loglvl);
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 	}
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 }
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