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authorMax Filippov <jcmvbkbc@gmail.com>2012-08-09 03:25:35 +0200
committerChris Zankel <chris@zankel.net>2012-12-19 06:10:20 +0100
commitc0226e34a4293dee0e7c5787e1ebfc5ee8b44b7c (patch)
tree730149cbd56ebfdd916420e9c9d39ded7005ec4f /arch/xtensa
parentxtensa: add config option to disable linker relaxation (diff)
downloadlinux-c0226e34a4293dee0e7c5787e1ebfc5ee8b44b7c.tar.xz
linux-c0226e34a4293dee0e7c5787e1ebfc5ee8b44b7c.zip
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>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/kernel/vectors.S14
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S
index 4462c1e595c2..3a57c15f7942 100644
--- a/arch/xtensa/kernel/vectors.S
+++ b/arch/xtensa/kernel/vectors.S
@@ -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