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Assembler changes with the gcc-47 distribution from ARM mean that we need to be explicit about branch one or more of the wide branch opcodes results in bad table branching. From Mike Smith

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This commit is contained in:
Gregory Nutt 2014-01-23 15:29:57 -06:00
parent 806b01deef
commit e4142f65fb
2 changed files with 20 additions and 16 deletions
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4
ChangeLog
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@ -6505,3 +6505,7 @@
* configs/efm32-dk3650: This is Energy Micro's development kit for
the Leopard Gecko MCU, which is an ARM Cortex-M3 device. From Richard
Cochran (2014-1-23).
* arch/arm/src/armv7-m/up_memcpy.S: Assembler changes with the gcc-47
distribution from ARM mean that we need to be explicit about branch
sizes; one or more of the wide branch opcodes results in bad table
branching. From Mike Smith (2014-1-23).

32
arch/arm/src/armv7-m/up_memcpy.S
View File

@ -152,7 +152,7 @@ memcpy:
/* Quickly check for very short copies */
cmp r2, #4
blt MEM_DataCopyBytes
blt.n MEM_DataCopyBytes
and r14, r0, #3 /* Get destination alignment bits */
bfi r14, r1, #2, #2 /* Get source alignment bits */
@ -199,7 +199,7 @@ MEM_DataCopy0:
/* Check for short word-aligned copy */
cmp r2, #0x28
blt MEM_DataCopy0_2
blt.n MEM_DataCopy0_2
/* Bulk copy loop */
@ -208,7 +208,7 @@ MEM_DataCopy0_1:
stmia r0!, {r3-r12}
sub r2, r2, #0x28
cmp r2, #0x28
bge MEM_DataCopy0_1
bge.n MEM_DataCopy0_1
/* Copy remaining long words */
@ -224,28 +224,28 @@ MEM_DataCopy0_2:
MEM_LongCopyJump:
ldr.w r3, [r1], #0x04 /* 4 bytes remain */
str.w r3, [r0], #0x04
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r4} /* 8 bytes remain */
stmia.w r0!, {r3-r4}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r5} /* 12 bytes remain */
stmia.w r0!, {r3-r5}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r6} /* 16 bytes remain */
stmia.w r0!, {r3-r6}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r7} /* 20 bytes remain */
stmia.w r0!, {r3-r7}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r8} /* 24 bytes remain */
stmia.w r0!, {r3-r8}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r9} /* 28 bytes remain */
stmia.w r0!, {r3-r9}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r10} /* 32 bytes remain */
stmia.w r0!, {r3-r10}
b MEM_LongCopyEnd
b.n MEM_LongCopyEnd
ldmia.w r1!, {r3-r11} /* 36 bytes remain */
stmia.w r0!, {r3-r11}
@ -308,7 +308,7 @@ MEM_DataCopy13:
MEM_DataCopy2:
cmp r2, #0x28
blt MEM_DataCopy2_1
blt.n MEM_DataCopy2_1
/* Save regs */
@ -345,18 +345,18 @@ MEM_DataCopy2_2:
sub r2, r2, #0x28
cmp r2, #0x28
bge MEM_DataCopy2_2
bge.n MEM_DataCopy2_2
pop {r4-r12}
MEM_DataCopy2_1: /* Read longs and write 2 x half words */
cmp r2, #4
blt MEM_DataCopyBytes
blt.n MEM_DataCopyBytes
ldr r3, [r1], #0x04
strh r3, [r0], #0x02
lsr r3, r3, #0x10
strh r3, [r0], #0x02
sub r2, r2, #0x04
b MEM_DataCopy2
b.n MEM_DataCopy2
/* Bits: Src=01, Dst=00 - Byte before half word to long
* Bits: Src=01, Dst=10 - Byte before half word to half word
@ -410,7 +410,7 @@ MEM_DataCopy3:
lsr r3, r3, #0x10
strb r3, [r0], #0x01
sub r2, r2, #0x04
b MEM_DataCopy3
b.n MEM_DataCopy3
.size memcpy, .-memcpy
.end