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| author |   Max Filippov <jcmvbkbc@gmail.com> | 2012-08-09 05:25:35 +0400 |
|---|---|---|
| committer |   Chris Zankel <chris@zankel.net> | 2012-12-18 21:10:20 -0800 |
| commit | c0226e34a4293dee0e7c5787e1ebfc5ee8b44b7c (patch) | |
| tree | 730149cbd56ebfdd916420e9c9d39ded7005ec4f /arch | |
| parent | xtensa: add config option to disable linker relaxation (diff) | |
| download | linux-dev-c0226e34a4293dee0e7c5787e1ebfc5ee8b44b7c.tar.xz linux-dev-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')
| -rw-r--r-- | arch/xtensa/kernel/vectors.S | 14 |
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 |