libpayload: payload exec code (repost)

[Jordan Crouse]

Here is a repost of the payload execute code for libpayload.
The API is described here:
http://www.coreboot.org/Payload_API

Jordan

[Uwe Hermann]

On Tue, May 20, 2008 at 10:46:15AM -0600, Jordan Crouse wrote:
> Here is a repost of the payload execute code for libpayload.
> The API is described here:
> http://www.coreboot.org/Payload_API
>
> Jordan
> libpayload:  Add an exec() and i386_do_exec() function
>
> Add functions for libpayload to execute other payloads in memory,
> and have those functions return cleanly.
>
> Signed-off-by: Jordan Crouse

Acked-by: Uwe Hermann

but see below for nitpicking...
> Index: libpayload/i386/Makefile.inc
>
> --- libpayload.orig/i386/Makefile.inc	2008-05-14 14:07:09.000000000 -0600
> +++ libpayload/i386/Makefile.inc	2008-05-14 14:11:29.000000000 -0600
> @@ -29,3 +29,4 @@
>
> TARGETS-y += i386/head.o i386/main.o i386/sysinfo.o
>  TARGETS-y += i386/timer.o i386/coreboot.o i386/util.o
> +TARGETS-y += i386/exec.o
> Index: libpayload/i386/exec.S
> ===================================================================
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ libpayload/i386/exec.S	2008-05-20 10:32:54.000000000 -0600
> @@ -0,0 +1,97 @@

[...]
> +/* calling syntax:  i386_do_exec(long addr, int argc, char **argv, int *ret) */
>
> +/* This implements the payload API detailed here:
> http://www.coreboot.org/Payload_API
>
> +*/

Use kernel-style commenting, please:

/*
 * This implements the payload API detailed here:
 * http://www.coreboot.org/Payload_API
 */
> +.align 4
> +.text
>
> +.global i386_do_exec
>    .type i386_do_exec,@function
>
> +i386_do_exec:
> pushl %ebp
>    movl %esp, %ebp
> pushl %eax

Whitespace inconsistency.
> # Put the run address in %eax

Wouldn't C-style /* */ comments also work? I think we use those
in some other asm code, let's keep them consistent.
> +/**
> Execute code in memory
> @param ptr The entry point to jump to
> @return Return the return value from the entry point
> */
>
> +int exec(long addr, int argc, char **argv)

No empty lines between doxygen-comment and function needed, drop.

Uwe.