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| author | Thomas Chou <thomas@wytron.com.tw> | 2010-08-16 10:49:44 +0800 |
|---|---|---|
| committer | Scott McNutt <smcnutt@psyent.com> | 2010-08-19 22:15:49 -0400 |
| commit | 7a6a7d10e6b96ab4a5c0d8852802ec52be2b582e (patch) | |
| tree | f8aad9ce824371f69022db5aedacd0f11477345d /arch/nios2/include/asm | |
| parent | 62a05573822fc253a1ad5037482511347d6abaa5 (diff) | |
| download | blackbird-obmc-uboot-7a6a7d10e6b96ab4a5c0d8852802ec52be2b582e.tar.gz blackbird-obmc-uboot-7a6a7d10e6b96ab4a5c0d8852802ec52be2b582e.zip | |
nios2: fix out of reach case for do_reset
There is a limitation (or bug?) of nios2 toolchain. The nios2 gcc
didn't generate correct code when the reset vector is passed as a
constant. It just generated a direct "call", which was wrong when
the reset vector was not located in the same 256MB span as u-boot.
The "Nios II Processor Reference Handbook" said,
"call can transfer execution anywhere within the 256 MByte range
determined by PC31..28. The Nios II GNU linker does not automatically
handle cases in which the address is out of this range."
So we have to use registered "callr" instruction to do the job.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
Diffstat (limited to 'arch/nios2/include/asm')
| -rw-r--r-- | arch/nios2/include/asm/system.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/system.h b/arch/nios2/include/asm/system.h index bb03ca5316..086d92bb0c 100644 --- a/arch/nios2/include/asm/system.h +++ b/arch/nios2/include/asm/system.h @@ -56,4 +56,9 @@ ((flags & NIOS2_STATUS_PIE_MSK) == 0x0); \ }) +/* indirect call to go beyond 256MB limitation of toolchain */ +#define nios2_callr(addr) __asm__ __volatile__ ( \ + "callr %0" \ + : : "r" (addr)) + #endif /* __ASM_NIOS2_SYSTEM_H */ |
