45 lines
993 B
Groff
45 lines
993 B
Groff
.\" $Header$
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.TH VC4_AS 1
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.ad
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.SH NAME
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vc4_as \- assembler for Broadcom VideoCore IV
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.SH SYNOPSIS
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/usr/em/lib/vc4_as [options] argument ...
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.SH DESCRIPTION
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This assembler is made with the general framework
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described in \fIuni_ass\fP(6).
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.SH SYNTAX
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The assembler uses a modified version of the syntax described in
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https://github.com/hermanhermitage/videocoreiv/wiki/VideoCore-IV-Programmers-Manual:
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condition codes must be prefixed with a full stop. Vector instructions are not
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yet supported.
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.SH "SEE ALSO"
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uni_ass(6),
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ack(1),
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.br
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https://github.com/hermanhermitage/videocoreiv
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.SH EXAMPLE
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.nf
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.ta 8n 16n 24n 32n 40n 48n
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An example of VideoCore IV assembly language:
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ldb r0, __uart_status
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b.eq r0, #0, 1b
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! receive 1 byte (returned in r0)
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mov r1, #AUX_MU_LSR_REG
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mov r2, #AUX_MU_IO_REG
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! loop until char available
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recvwait:
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ld r3, (r1)
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and r3, #0x1
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b.ne r3, #0x1, recvwait
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ldb r0, (r2)
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1:
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b lr
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.fi
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