Commit 32015c23 authored by Tyler Baicar's avatar Tyler Baicar Committed by Will Deacon
Browse files

arm64: exception: handle Synchronous External Abort 



SEA exceptions are often caused by an uncorrected hardware
error, and are handled when data abort and instruction abort
exception classes have specific values for their Fault Status
Code.
When SEA occurs, before killing the process, report the error
in the kernel logs.
Update fault_info[] with specific SEA faults so that the
new SEA handler is used.

Signed-off-by: default avatarTyler Baicar <tbaicar@codeaurora.org>
CC: Jonathan (Zhixiong) Zhang <zjzhang@codeaurora.org>
Reviewed-by: default avatarJames Morse <james.morse@arm.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
[will: use NULL instead of 0 when assigning si_addr]
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 2f74f09b

arch/arm64/include/asm/esr.h

+1 −0
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ 
#define ESR_ELx_WNR		(UL(1) << 6)



/* Shared ISS field definitions for Data/Instruction aborts */

#define ESR_ELx_FnV		(UL(1) << 10)

#define ESR_ELx_EA		(UL(1) << 9)

#define ESR_ELx_S1PTW		(UL(1) << 7)

arch/arm64/mm/fault.c

+35 −10
Original line number Diff line number Diff line
@@ -522,6 +522,31 @@ static int do_bad(unsigned long addr, unsigned int esr, struct pt_regs *regs) 
	return 1;

}



/*

 * This abort handler deals with Synchronous External Abort.

 * It calls notifiers, and then returns "fault".

 */

static int do_sea(unsigned long addr, unsigned int esr, struct pt_regs *regs)

{

	struct siginfo info;

	const struct fault_info *inf;



	inf = esr_to_fault_info(esr);

	pr_err("Synchronous External Abort: %s (0x%08x) at 0x%016lx\n",

		inf->name, esr, addr);



	info.si_signo = SIGBUS;

	info.si_errno = 0;

	info.si_code  = 0;

	if (esr & ESR_ELx_FnV)

		info.si_addr = NULL;

	else

		info.si_addr  = (void __user *)addr;

	arm64_notify_die("", regs, &info, esr);



	return 0;

}



static const struct fault_info fault_info[] = {

	{ do_bad,		SIGBUS,  0,		"ttbr address size fault"	},

	{ do_bad,		SIGBUS,  0,		"level 1 address size fault"	},
@@ -539,22 +564,22 @@ static const struct fault_info fault_info[] = { 
	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 1 permission fault"	},

	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 2 permission fault"	},

	{ do_page_fault,	SIGSEGV, SEGV_ACCERR,	"level 3 permission fault"	},

	{ do_bad,		SIGBUS,  0,		"synchronous external abort"	},

	{ do_sea,		SIGBUS,  0,		"synchronous external abort"	},

	{ do_bad,		SIGBUS,  0,		"unknown 17"			},

	{ do_bad,		SIGBUS,  0,		"unknown 18"			},

	{ do_bad,		SIGBUS,  0,		"unknown 19"			},

	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous external abort (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous parity error"	},

	{ do_sea,		SIGBUS,  0,		"level 0 (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 1 (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 2 (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 3 (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"synchronous parity or ECC error" },

	{ do_bad,		SIGBUS,  0,		"unknown 25"			},

	{ do_bad,		SIGBUS,  0,		"unknown 26"			},

	{ do_bad,		SIGBUS,  0,		"unknown 27"			},

	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },

	{ do_bad,		SIGBUS,  0,		"synchronous parity error (translation table walk)" },

	{ do_sea,		SIGBUS,  0,		"level 0 synchronous parity error (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 1 synchronous parity error (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 2 synchronous parity error (translation table walk)"	},

	{ do_sea,		SIGBUS,  0,		"level 3 synchronous parity error (translation table walk)"	},

	{ do_bad,		SIGBUS,  0,		"unknown 32"			},

	{ do_alignment_fault,	SIGBUS,  BUS_ADRALN,	"alignment fault"		},

	{ do_bad,		SIGBUS,  0,		"unknown 34"			},

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