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Use thumb-compatible byte swap routines when building with -mthumb.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29391 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2011-02-24 23:12:00 +00:00
parent 9c2e7fd362
commit 00e5a9c088
1 changed files with 31 additions and 0 deletions
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31
firmware/target/arm/system-arm.h
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@ -207,6 +207,18 @@ static inline uint32_t swap32_hw(uint32_t value)
result[ 7.. 0] = value[31..24];
*/
{
#ifdef __thumb__
uint32_t mask = 0x00FF00FF;
asm volatile (
"and %1, %0 \n\t" /* mask = .B.D */
"eor %0, %1 \n\t" /* val = A.C. */
"lsl %1, #8 \n\t" /* mask = B.D. */
"lsr %0, #8 \n\t" /* val = .A.C */
"orr %0, %1 \n\t" /* val = BADC */
"mov %1, #16 \n\t" /* mask = 16 */
"ror %0, %1 \n\t" /* val = DCBA */
: "+l"(value), "+l"(mask));
#else
uint32_t tmp;
asm volatile (
"eor %1, %0, %0, ror #16 \n\t"
@ -215,6 +227,7 @@ static inline uint32_t swap32_hw(uint32_t value)
"eor %0, %0, %1, lsr #8 \n\t"
: "+r" (value), "=r" (tmp)
);
#endif
return value;
}
@ -224,6 +237,16 @@ static inline uint32_t swap_odd_even32_hw(uint32_t value)
result[31..24],[15.. 8] = value[23..16],[ 7.. 0]
result[23..16],[ 7.. 0] = value[31..24],[15.. 8]
*/
#ifdef __thumb__
uint32_t mask = 0x00FF00FF;
asm volatile (
"and %1, %0 \n\t" /* mask = .B.D */
"eor %0, %1 \n\t" /* val = A.C. */
"lsl %1, #8 \n\t" /* mask = B.D. */
"lsr %0, #8 \n\t" /* val = .A.C */
"orr %0, %1 \n\t" /* val = BADC */
: "+l"(value), "+l"(mask));
#else
uint32_t tmp;
asm volatile ( /* ABCD */
"bic %1, %0, #0x00ff00 \n\t" /* AB.D */
@ -232,6 +255,7 @@ static inline uint32_t swap_odd_even32_hw(uint32_t value)
"orr %0, %0, %1, lsl #8 \n\t" /* B.D.|.A.C */
: "+r" (value), "=r" (tmp) /* BADC */
);
#endif
return value;
}
@ -278,10 +302,17 @@ static inline uint32_t swaw32_hw(uint32_t value)
result[31..16] = value[15.. 0];
result[15.. 0] = value[31..16];
*/
#ifdef __thumb__
asm volatile ("ror %0, %1" :
"+l"(value) : "l"(16));
return value;
#else
uint32_t retval;
asm volatile ("mov %0, %1, ror #16" :
"=r"(retval) : "r"(value));
return retval;
#endif
}
#endif /* SYSTEM_ARM_H */