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xtensa: implement jump_label support

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Use 3-byte 'nop' and 'j' instructions that are always present. Don't let
assembler mark a spot right after patchable 'j' instruction as
unreachable and later put literals or padding bytes there. Add separate
implementations of patch_text for SMP and UP cases, avoiding use of
atomics on UP.

Signed-off-by: Max Filippov <[email protected]>
This commit is contained in:
Max Filippov 2018-12-19 19:48:37 -08:00
commit 64711f9a47
5 changed files with 167 additions and 1 deletions
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Documentation/features/core/jump-labels/arch-support.txt
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@ -29,5 +29,5 @@
| um: | TODO |
| unicore32: | TODO |
| x86: | ok |
| xtensa: | TODO |
| xtensa: | ok |
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