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xtensa: make DoubleExceptionVector literals fit the gap 

Manually load references to exc_table from the explicit literal in order
to fit DoubleExceptionVector.literals into the available 16-byte gap
before DoubleExceptionVector.text in the absence of link time
relaxation. Without this fix DoubleExceptionVector.literal section
overlaps DoubleExceptionVector.text section in the linked vmlinux image.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
This commit is contained in:
Max Filippov 2012-08-09 05:25:35 +04:00 committed by Chris Zankel
parent 6550162200
commit c0226e34a4
1 changed files with 10 additions and 4 deletions
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14
arch/xtensa/kernel/vectors.S
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@ -225,7 +225,13 @@ ENTRY(_DoubleExceptionVector)
/* Window overflow/underflow exception. Get stack pointer. */
mov a3, a2
movi a2, exc_table
/* This explicit literal and the following references to it are made
* in order to fit DoubleExceptionVector.literals into the available
* 16-byte gap before DoubleExceptionVector.text in the absence of
* link time relaxation. See kernel/vmlinux.lds.S
*/
.literal .Lexc_table, exc_table
l32r a2, .Lexc_table
l32i a2, a2, EXC_TABLE_KSTK
/* Check for overflow/underflow exception, jump if overflow. */
@ -255,7 +261,7 @@ ENTRY(_DoubleExceptionVector)
s32i a0, a2, PT_AREG0
wsr a3, excsave1 # save a3
movi a3, exc_table
l32r a3, .Lexc_table
rsr a0, exccause
s32i a0, a2, PT_DEPC # mark it as a regular exception
@ -267,7 +273,7 @@ ENTRY(_DoubleExceptionVector)
/* a0: depc, a1: a1, a2: a2, a3: trashed, depc: a0, excsave1: a3 */
movi a3, exc_table
l32r a3, .Lexc_table
s32i a2, a3, EXC_TABLE_DOUBLE_SAVE # temporary variable
/* Enter critical section. */
@ -296,7 +302,7 @@ ENTRY(_DoubleExceptionVector)
/* a0: avail, a1: a1, a2: kstk, a3: avail, depc: a2, excsave: a3 */
movi a3, exc_table
l32r a3, .Lexc_table
rsr a0, exccause
addx4 a0, a0, a3
l32i a0, a0, EXC_TABLE_FAST_USER