forked from Lainports/freebsd-ports
a8648441fb
direction flag ("std"), but does not clear it ("cld"). This is invalid
according to GCC (inline assembler, which sets the direction flag,
must reset it[0]) and the SYS V ABI (functions must leave with the
direction flag cleared[1]). The macro is (indirectly, exact call
sequence below) used in SDL_BlitSurface(), so this call sometimes
returns with the direction flag set. This happens for bliting a surface
onto itself with the destination coordinates set right/down of the source
coordinates (typical use of this is scrolling left/up). Later on other
parts of the code (like inlined memcpy()) cause memory corruption. [1]
- Give maintaintership to submitter (as discussed on irc)
PR: ports/120052 [1]
10 lines
346 B
C
10 lines
346 B
C
--- include/SDL_stdinc.h.orig 2006-06-27 00:48:32.000000000 -0400
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+++ include/SDL_stdinc.h 2008-01-27 12:47:15.000000000 -0500
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@@ -319,6 +319,7 @@
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__asm__ __volatile__ ( \
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"std\n\t" \
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"rep ; movsl\n\t" \
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+ "cld\n\t" \
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: "=&c" (u0), "=&D" (u1), "=&S" (u2) \
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: "0" (n >> 2), \
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"1" (dstp+(n-4)), "2" (srcp+(n-4)) \
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