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xtensa: Add hook to do register window spills

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This macro was already available add an external symbol so C code can
access it (via CALL0 -- it's not and can't be an actual function).

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-01-09 12:06:04 -08:00 • committed by Anas Nashif
commit 60932d1427
1 changed files with 16 additions and 1 deletions
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17
arch/xtensa/core/xtensa-asm2-util.S
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@ -6,6 +6,22 @@
#include <xtensa-asm2-s.h>
#include <offsets.h>
/*
* xtensa_spill_reg_windows
*
* Globally visible symbol to do register spills. Useful for unit
* testing, or maybe as part of a debug/watchdog/error handler. Not a
* C function, call this via CALL0 (so you probably have to save off
* A0, but no other registers need to be spilled). On return, all
* registers not part of the current function will be spilled to
* memory.
*/
.global xtensa_spill_reg_windows
.align 4
xtensa_spill_reg_windows:
SPILL_ALL_WINDOWS
ret
/*
* xtensa_save_high_regs
*
@ -117,7 +133,6 @@ _high_restore_done:
* from switch or an interrupt exit. Interrupts must be disabled,
* and register windows should have been spilled.
*
* Note that exit from the restore is done with the RFI instruction,
* using the EPCn/EPSn registers. Those will have been saved already
* by any interrupt entry so they are save to use. Note that EPC1 and