[prefix] Add rudimentary debugging messages to libprefix
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
parent
3f13e3d5d2
commit
17ef28414f
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@ -27,6 +27,33 @@ FILE_LICENCE ( GPL2_OR_LATER )
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/* Protected mode flag */
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#define CR0_PE 1
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/* Allow for DBG()-style messages within libprefix */
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#ifdef NDEBUG
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.macro progress message
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.endm
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#else
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.macro progress message
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pushfl
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pushw %ds
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pushw %si
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pushw %di
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pushw %cs
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popw %ds
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xorw %di, %di
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movw $progress_\@, %si
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call print_message
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popw %di
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popw %si
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popw %ds
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popfl
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.section ".prefix.data", "aw", @progbits
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progress_\@:
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.asciz "\message"
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.size progress_\@, . - progress\@
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.previous
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.endm
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#endif
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/*****************************************************************************
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* Utility function: print character (with LF -> LF,CR translation)
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*
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@ -583,6 +610,7 @@ hooked_bios_interrupts:
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.code16
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.globl install
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install:
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progress "install:\n"
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/* Preserve registers */
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pushl %esi
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pushl %edi
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@ -621,6 +649,7 @@ install:
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.code16
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.globl install_prealloc
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install_prealloc:
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progress "install_prealloc:\n"
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/* Save registers */
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pushal
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pushw %ds
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@ -636,6 +665,7 @@ install_prealloc:
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movl %edi, %ebp
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/* Install .text16.early */
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progress " .text16.early\n"
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pushl %esi
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xorl %esi, %esi
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movw %cs, %si
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@ -653,6 +683,7 @@ install_prealloc:
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* already have 4GB segment limits as a result of calling
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* install_block.)
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*/
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progress " access_highmem\n"
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pushw %cs
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pushw $1f
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pushw %ax
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@ -673,6 +704,7 @@ a20_death_message:
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#endif
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/* Open payload (which may not yet be in memory) */
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progress " open_payload\n"
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pushw %cs
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pushw $1f
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pushw %ax
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@ -701,9 +733,11 @@ payload_death_message:
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1: addl payload_lma, %esi
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/* Install .text16.late and .data16 */
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progress " .text16.late\n"
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movl $_text16_late_filesz, %ecx
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movl $_text16_late_memsz, %edx
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call install_block /* .text16.late */
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progress " .data16\n"
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movzwl %bx, %edi
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shll $4, %edi
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movl $_data16_filesz, %ecx
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@ -738,12 +772,14 @@ payload_death_message:
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* prior to reading the E820 memory map and relocating
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* properly.
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*/
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progress " .textdata\n"
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movl %ebp, %edi
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movl $_textdata_filesz, %ecx
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movl $_textdata_memsz, %edx
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call install_block
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/* Initialise librm at current location */
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progress " init_librm\n"
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movw %ax, (init_librm_vector+2)
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movl %ebp, %edi
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lcall *init_librm_vector
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@ -757,12 +793,14 @@ payload_death_message:
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* relocate() will return with %esi, %edi and %ecx set up
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* ready for the copy to the new location.
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*/
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progress " relocate\n"
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movw %ax, (prot_call_vector+2)
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pushl $relocate
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lcall *prot_call_vector
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popl %edx /* discard */
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/* Copy code to new location */
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progress " copy\n"
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pushl %edi
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pushw %bx
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movw $copy_bytes, %bx
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@ -771,11 +809,13 @@ payload_death_message:
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popl %edi
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/* Initialise librm at new location */
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progress " init_librm\n"
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lcall *init_librm_vector
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skip_relocate:
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#endif
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/* Close access to payload */
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progress " close_payload\n"
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movw %ax, (close_payload_vector+2)
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lcall *close_payload_vector
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