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Re: hal_platform_setup memory copying code
- From: Gary Thomas <gary at mlbassoc dot com>
- To: ecosrtos ecosrtos <ecosrtos at gmail dot com>
- Cc: eCos Discussion <ecos-discuss at ecos dot sourceware dot org>
- Date: Mon, 31 Jan 2005 15:12:40 -0700
- Subject: Re: [ECOS] hal_platform_setup memory copying code
- Organization: MLB Associates
- References: <852b699905013114071c803440@mail.gmail.com>
On Mon, 2005-01-31 at 14:07 -0800, ecosrtos ecosrtos wrote:
> Hi
> How do r1 and r0 get incremented in the following code. Is it implicit
> in some instruction?
>
> #if defined(CYG_HAL_STARTUP_ROMRAM)
> ldr r0,=0x01000000 // Relocate FLASH/ROM to on-chip RAM
> ldr r1,=0x02000000 // RAM base & length
> ldr r2,=0x02010000
> 20: ldr r3,[r0],#4
> str r3,[r1],#4
> cmp r1,r2
> bne 20b
> ldr r0,=30f
> mov pc,r0
> 30:
> #endif
Yes, the address form [r0],#4 is the same as the C construct *ptr++
It [post] increments the value in register r0.
--
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Gary Thomas | Consulting for the
MLB Associates | Embedded world
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