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ARM: 9279/1: support function error injection
This enables HAVE_FUNCTION_ERROR_INJECTION by adding necessary regs_set_return_value() and override_function_with_return(). Simply tested according to Documentation/fault-injection/fault-injection.rst. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
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4 changed files with 17 additions and 0 deletions
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@ -97,6 +97,7 @@ config ARM
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select HAVE_EXIT_THREAD
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select HAVE_FAST_GUP if ARM_LPAE
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select HAVE_FTRACE_MCOUNT_RECORD if !XIP_KERNEL
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select HAVE_FUNCTION_ERROR_INJECTION
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select HAVE_FUNCTION_GRAPH_TRACER
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select HAVE_FUNCTION_TRACER if !XIP_KERNEL
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select HAVE_GCC_PLUGINS
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@ -163,6 +163,10 @@ static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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((current_stack_pointer | (THREAD_SIZE - 1)) - 7) - 1; \
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})
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static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
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{
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regs->ARM_r0 = rc;
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}
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/*
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* Update ITSTATE after normal execution of an IT block instruction.
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@ -44,3 +44,5 @@ ifeq ($(CONFIG_KERNEL_MODE_NEON),y)
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CFLAGS_xor-neon.o += $(NEON_FLAGS)
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obj-$(CONFIG_XOR_BLOCKS) += xor-neon.o
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endif
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obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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10
arch/arm/lib/error-inject.c
Normal file
10
arch/arm/lib/error-inject.c
Normal file
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@ -0,0 +1,10 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/error-injection.h>
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#include <linux/kprobes.h>
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void override_function_with_return(struct pt_regs *regs)
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{
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instruction_pointer_set(regs, regs->ARM_lr);
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}
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NOKPROBE_SYMBOL(override_function_with_return);
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