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linux/arch/riscv
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Xianting Tian d79c340488 RISC-V: Add fast call path of crash_kexec() 
[ Upstream commit 3f1901110a ]

Currently, almost all archs (x86, arm64, mips...) support fast call
of crash_kexec() when "regs && kexec_should_crash()" is true. But
RISC-V not, it can only enter crash system via panic(). However panic()
doesn't pass the regs of the real accident scene to crash_kexec(),
it caused we can't get accurate backtrace via gdb,
	$ riscv64-linux-gnu-gdb vmlinux vmcore
	Reading symbols from vmlinux...
	[New LWP 95]
	#0  console_unlock () at kernel/printk/printk.c:2557
	2557                    if (do_cond_resched)
	(gdb) bt
	#0  console_unlock () at kernel/printk/printk.c:2557
	#1  0x0000000000000000 in ?? ()

With the patch we can get the accurate backtrace,
	$ riscv64-linux-gnu-gdb vmlinux vmcore
	Reading symbols from vmlinux...
	[New LWP 95]
	#0  0xffffffe00063a4e0 in test_thread (data=<optimized out>) at drivers/test_crash.c:81
	81             *(int *)p = 0xdead;
	(gdb)
	(gdb) bt
	#0  0xffffffe00064d5c0 in test_thread (data=<optimized out>) at drivers/test_crash.c:81
	#1  0x0000000000000000 in ?? ()

Test code to produce NULL address dereference in test_crash.c,
	void *p = NULL;
	*(int *)p = 0xdead;

Reviewed-by: Guo Ren <guoren@kernel.org>
Tested-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Signed-off-by: Xianting Tian <xianting.tian@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220606082308.2883458-1-xianting.tian@linux.alibaba.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2022-08-25 11:45:50 +02:00
..
boot riscv: dts: canaan: Add k210 topology information 2022-08-25 11:45:49 +02:00
configs RISC-V: configs: Configs that had RPMSG_CHAR now get RPMSG_CTRL 2022-04-26 08:19:53 -07:00
errata riscv: don't warn for sifive erratas in modules 2022-07-07 23:09:16 -07:00
include RISC-V: Declare cpu_ops_spinwait in <asm/cpu_ops.h> 2022-08-17 15:13:49 +02:00
kernel RISC-V: Add fast call path of crash_kexec() 2022-08-25 11:45:50 +02:00
kvm RISC-V: KVM: Fix SRCU deadlock caused by kvm_riscv_check_vcpu_requests() 2022-07-11 09:36:32 +05:30
lib riscv: lib: uaccess: fix CSR_STATUS SR_SUM bit 2022-08-17 15:13:49 +02:00
mm RISC-V: Add modules to virtual kernel memory layout dump 2022-08-17 15:13:50 +02:00
net riscv, bpf: Implement more atomic operations for RV64 2022-04-11 16:54:54 +02:00
purgatory RISC-V: Add purgatory 2022-05-19 12:18:59 -07:00
Kbuild riscv: move errata/ and kvm/ builds to arch/riscv/Kbuild 2022-06-01 22:26:32 -07:00
Kconfig riscv/mm: fix build error while PAGE_TABLE_CHECK enabled without MMU 2022-07-03 15:42:32 -07:00
Kconfig.debug RISC-V: Remove EARLY_PRINTK support 2018-12-17 10:23:46 -08:00
Kconfig.erratas riscv: fix dependency for t-head errata 2022-06-16 15:42:55 -07:00
Kconfig.socs RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
Makefile riscv: compat: vdso: Fix vdso_install target 2022-07-22 12:23:14 -07:00