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5.4.21 SYS_ELAPSED (0x30)

Returns the number of elapsed target ticks since the support code started execution. Use

SYS_TICKFREQ to determine the tick frequency.

Entry

On entry, r1 points to a two-word data block to be used for returning the number of

elapsed ticks:

word 1 The least significant word in the doubleword value.

word 2 The most significant word.

Return

On exit, :

• r0 contains –1 if r1 does point to a doubleword containing the number of elapsed

ticks. Multi-ICE does not support this SWI and always returns –1 in r0.

• r1 points to a doubleword (low-order word first) that contains the number of

elapsed ticks.

5.4.22 SYS_TICKFREQ (0x31)

Returns the tick frequency.

Entry

Return

On exit, r0 contains either:

• the number ticks per second

•–1 if the target does not know the value of one tick. Multi-ICE does not support

this SWI and always returns –1.

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ARM VERSION 1.2 Ficha Técnica Página 164