脚本宝典收集整理的这篇文章主要介绍了kernel exception时打印出的ESR相关信息，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
<1>[ 7766.006249] Unhandled fault at 0xffffff800188d408 <1>[ 7766.006256] Mem abort info: <1>[ 7766.006259] ESR = 0x86000003 <1>[ 7766.006264] Exception class = IABT (current EL), IL = 32 bits <1>[ 7766.006268] SET = 0, FnV = 0 <1>[ 7766.006271] EA = 0, S1PTW = 0 <1>[ 7766.006277] swapper pgtable: 4k pages, 39-bit VAs, pgdp = 00000000352033d5 <1>[ 7766.006281] [ffffff800188d408] pgd=000000009d7fe003, pud=000000009d7fe003, pmd=00000000625c6003, pte=0040080063544793 <0>[ 7766.006294] Internal error: level 3 address size fault: 86000003 [#1] PREEMPT SMP
上述kernel exception时打印出的ESR(Exception Syndrome Register (EL1))值为0x86000003，看下ESR_EL1 register bit assignment：
ESR_EL1是一个64bit register，先要看EC（exception class） field，这个field是在这个register的bit[31:26]，占6bit
此实例中EC值是0x21（0b100001），查看EC值解释表，可以得知0b100001是instruction abort，然后查看instruction abort对应的ISS
| EC | Meaning | ISS | Applies when |
|---|---|---|---|
| 0b000000 |
Unknown reason. |
ISS encoding for exceptions with an unknown reason | |
| 0b000001 |
Trapped WF* instruction execution. Conditional WF* instructions that fail their condition code check do not cause an exception. |
ISS encoding for an exception from a WF* instruction |
| 0b100001 |
Instruction Abort taken without a change in Exception level. Used for MMU faults generated by instruction accesses and synchronous External aborts, including synchronous parity or ECC errors. Not used for debug-related exceptions. |
ISS encoding for an exception from an Instruction Abort |
主要看IFSC bit field，这个bit field值的含义说明在如下的table里，在本实例中，IFSC bit field的值是3，所以是“Address size fault, level 3”
ISS encoding for an exception from an Instruction Abort
| 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RES0 | SET | FnV | EA | RES0 | S1PTW | RES0 | IFSC | |||||||||||||||||
Instruction Fault Status Code.
| IFSC | Meaning | Applies when |
|---|---|---|
| 0b000000 |
Address size fault, level 0 of translation or translation table base register. |
|
| 0b000001 |
Address size fault, level 1. |
|
| 0b000010 |
Address size fault, level 2. |
|
| 0b000011 |
Address size fault, level 3. |
|
| 0b000100 |
Translation fault, level 0. |
|
| 0b000101 |
Translation fault, level 1. |
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