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9df238a8aa
Commit 2422647 ("[prefix] Allow prefix to specify an arbitrary maximum
address for relocation") introduced a regression into the UNDI ROM
loader by preserving an extra register on the stack without modifying
the %sp-relative addresses used in the routine.
Fix by correcting the %sp-relative addresses to allow for the extra
preserved variable.
Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
55 lines
1020 B
ArmAsm
55 lines
1020 B
ArmAsm
FILE_LICENCE ( GPL2_OR_LATER )
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.text
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.code16
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.arch i386
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.section ".prefix", "ax", @progbits
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/* UNDI loader
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*
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* Called by an external program to load our PXE stack.
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*/
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.globl undiloader
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undiloader:
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/* Save registers */
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pushl %esi
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pushl %edi
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pushl %ebp
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pushw %ds
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pushw %es
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pushw %bx
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/* ROM segment address to %ds */
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pushw %cs
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popw %ds
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/* UNDI loader parameter structure address into %es:%di */
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movw %sp, %bx
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movw %ss:22(%bx), %di
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movw %ss:24(%bx), %es
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/* Install to specified real-mode addresses */
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pushw %di
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movw %es:12(%di), %bx
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movw %es:14(%di), %ax
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movl image_source, %esi
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movl decompress_to, %edi
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orl $0xffffffff, %ebp /* Allow arbitrary relocation */
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call install_prealloc
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popw %di
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/* Call UNDI loader C code */
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pushl $pxe_loader_call
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pushw %cs
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pushw $1f
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pushw %ax
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pushw $prot_call
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lret
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1: popw %bx /* discard */
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popw %bx /* discard */
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/* Restore registers and return */
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popw %bx
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popw %es
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popw %ds
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popl %ebp
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popl %edi
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popl %esi
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lret
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.size undiloader, . - undiloader
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