forked from len0rd/rockbox
c2933cd46e
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18682 a1c6a512-1295-4272-9138-f99709370657
55 lines
1.6 KiB
ArmAsm
55 lines
1.6 KiB
ArmAsm
/* int ucl_nrv2e_decompress_8(const unsigned char *src, unsigned char *dst,
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unsigned long *dst_len) */
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.text
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.global ucl_nrv2e_decompress_8
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/* Vectors */
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ldr pc, =start
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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.word 0
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/* These values are filled in by mkamsboot - don't move them from offset 0x20 */
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ucl_unpack: .word 0 /* Entry point (plus 1 - for thumb) of ucl_unpack after copy*/
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ucl_start: .word 0 /* Start of the ucl-compressed OF image after copy */
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ucl_size: .word 0 /* Length in bytes of the compressed OF image */
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copy_start: .word 0 /* Start of the copy of the ucl_unpack function */
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copy_size: .word 0 /* uclunpack_size + ucl_paddedsize */
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start:
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/* A delay loop - just to prove we're running */
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mov r1, #0x500000 /* Approximately 5 seconds */
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loop: subs r1, r1, #1
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bne loop
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/* First copy the compressed firmware to unused RAM */
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ldr r0, copy_start /* Source */
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ldr r1, copy_size /* Source length */
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mov r2, #0x40000 /* Destination end */
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sub r2, r2, r1
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memcpy:
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ldrb r3, [r0], #1
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strb r3, [r2], #1
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cmp r2, #0x40000 /* Stop when we reached dest_end */
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bne memcpy
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/* Call the ucl decompress function, which will branch to 0x0 */
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/* on completion */
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ldr r0, ucl_start /* Address of compressed image */
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ldr r1, ucl_size /* Compressed size */
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mov r2, #0 /* Destination */
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ldr r3, ucl_unpack
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bx r3
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/* never reached */
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