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arm64: support single-step and breakpoint handler hooks

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AArch64 Single Steping and Breakpoint debug exceptions will be
used by multiple debug framworks like kprobes & kgdb.

This patch implements the hooks for those frameworks to register
their own handlers for handling breakpoint and single step events.

Reworked the debug exception handler in entry.S: do_dbg to route
software breakpoint (BRK64) exception to do_debug_exception()

Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu@linaro.org>
Signed-off-by: Deepak Saxena <dsaxena@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sandeepa Prabhu
2013-12-04 05:50:20 +00:00
committed by Catalin Marinas
parent 26920dd2da
commit ee6214cec7
3 changed files with 110 additions and 1 deletions
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2
arch/arm64/kernel/entry.S
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@@ -288,6 +288,8 @@ el1_dbg:
/*
* Debug exception handling
*/
cmp x24, #ESR_EL1_EC_BRK64 // if BRK64
cinc x24, x24, eq // set bit '0'
tbz x24, #0, el1_inv // EL1 only
mrs x0, far_el1
mov x2, sp // struct pt_regs