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Apply Akio Idehara's fix for FS#7972 - Fix ARM's swp (xchg) inline assembly for gcc 4.2. Also avoids UNPREDICTABLE behavior that GCC should have always warned about.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15157 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2007-10-17 00:01:03 +00:00
parent fc43b9df82
commit 4829f7835a
1 changed files with 3 additions and 3 deletions
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6
firmware/export/thread.h
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@ -372,7 +372,7 @@ struct core_entry
({ uint32_t o; \ ({ uint32_t o; \
asm volatile( \ asm volatile( \
"swpb %0, %1, [%2]" \ "swpb %0, %1, [%2]" \
: "=r"(o) \ : "=&r"(o) \
: "r"(v), \ : "r"(v), \
"r"((uint8_t*)(a))); \ "r"((uint8_t*)(a))); \
o; }) o; })
@ -381,7 +381,7 @@ struct core_entry
({ uint32_t o; \ ({ uint32_t o; \
asm volatile( \ asm volatile( \
"swp %0, %1, [%2]" \ "swp %0, %1, [%2]" \
: "=r"(o) \ : "=&r"(o) \
: "r"((uint32_t)(v)), \ : "r"((uint32_t)(v)), \
"r"((uint32_t*)(a))); \ "r"((uint32_t*)(a))); \
o; }) o; })
@ -390,7 +390,7 @@ struct core_entry
({ typeof (*(a)) o; \ ({ typeof (*(a)) o; \
asm volatile( \ asm volatile( \
"swp %0, %1, [%2]" \ "swp %0, %1, [%2]" \
: "=r"(o) \ : "=&r"(o) \
: "r"(v), "r"(a)); \ : "r"(v), "r"(a)); \
o; }) o; })
#endif /* locking selection */ #endif /* locking selection */