mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-04 16:50:57 +00:00
148 lines
4.7 KiB
ArmAsm
148 lines
4.7 KiB
ArmAsm
.syntax unified
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.cpu cortex-m4
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.fpu fpv4-sp-d16
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.text
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.align 1
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.thumb
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.thumb_func
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.global _start
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_start:
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@ LDM CASE #1 (used when rx is in upper_list)
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@ ldm rx, {...} ->
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@ ldm rx!, {lower_list}
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@ ldm rx, {upper_list}
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@ b.w
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ldm.w r9, {r1-r9}
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@ LDM CASE #1 bis (used when rx is in upper_list and pc is
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@ in reglist)
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@ ldm rx, {...} ->
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@ ldm rx!, {lower_list}
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@ ldm rx, {upper_list}
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ldm.w r9, {r1-r9, pc}
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@ LDM CASE #2 (used when rx is not in upper_list)
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@ ldm rx, {...} ->
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@ mov ry, rx where ry is the lowest register from upper_list
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@ ldm ry!, {lower_list}
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@ ldm ry, {upper_list}
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@ b.w
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ldm.w r0, {r1-r9}
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@ LDM CASE #2 bis (used when rx is in lower_list)
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@ ldm rx, {...} ->
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@ mov ry, rx where ry is the lowest register from upper_list
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@ ldm ry!, {lower_list}
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@ ldm ry, {upper_list}
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@ b.w
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ldm.w r1, {r1-r9}
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@ LDM CASE #2 ter (used when rx is not in upper_list and pc is
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@ in reglist)
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@ ldm rx, {...} ->
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@ mov ry, rx where ry is the lowest register from upper_list
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@ ldm ry!, {lower_list}
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@ ldm ry, {upper_list}
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ldm.w r0, {r1-r9, pc}
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@ LDM CASE #2 quater (used when rx is in lower_list and pc is
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@ in reglist)
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@ ldm rx, {...} ->
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@ mov ry, rx where ry is the lowest register from upper_list
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@ ldm ry!, {lower_list}
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@ ldm ry, {upper_list}
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ldm.w r1, {r1-r9, pc}
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@ LDM CASE #3 (used when rx is not in upper_list)
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@ ldm rx, {...} ->
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@ ldm rx!, {lower_list}
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@ ldm rx!, {upper_list}
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@ b.w
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@ Write-back variant are unpredictable when rx appears also in
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@ the loaded registers
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ldm.w r0!, {r1-r9}
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@ LDM CASE #3 bis (used when rx is not in upper_list and pc is
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@ in reglist)
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@ ldm rx, {...} ->
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@ ldm rx!, {lower_list}
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@ ldm rx!, {upper_list}
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ldm.w r0!, {r1-r9, pc}
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@ LDM CASE #4 (used when pc is not in reglist and rx is in
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@ lower_list)
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@ ldmb rx, {...} ->
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@ ldmb rx!, {upper_list}
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@ ldmb rx, {lower_list}
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ldmdb.w r1, {r1-r9}
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@ LDM CASE #5 (used when pc is not in reglist and rx is not in
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@ lower_list)
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@ It looks like it this mean that it could be in upper_list or not
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@ ldmdb rx, {...} ->
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@ mov ry, rx where ry is the lowest register from lower_list
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@ ldmdb ry!, {upper_list}
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@ ldmdb ry , {lower_list}
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@ b.w
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ldmdb.w sl, {r1-r9}
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@ LDM CASE #5 bis (used when pc is not in reglist and rx is in
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@ upper_list)
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@ ldmdb rx, {...} ->
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@ mov ry, rx where ry is the lowest register from lower_list
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@ ldmdb ry!, {upper_list}
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@ ldmdb ry , {lower_list}
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@ b.w
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ldmdb.w r9, {r1-r9}
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@ LDM CASE #6 (used when pc is in reglist and rx is in
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@ upper_list)
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@ ldmdb rx, {...} ->
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@ sub rx, rx, #size (lower_list + upper_list)
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@ ldm rx!, {lower_list}
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@ ldm rx, {upper_list}
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@ This case reverses the load order
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ldmdb.w r9, {r1-r9, pc}
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@ LDM CASE #6 bis (used when pc is in reglist and rx is in
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@ lower_list)
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@ ldmdb rx, {...} ->
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@ sub rx, rx, #size (lower_list + upper_list)
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@ ldm rx!, {lower_list}
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@ ldm rx, {upper_list}
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ldmdb.w r1, {r1-r9, pc}
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@ LDM CASE #7 (used when pc is in reglist and rx is not in
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@ upper_list)
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@ ldmdb rx, {...} ->
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@ sub ry, rx, #size (lower_list + upper_list) where ry is the lowest
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@ register of the upper list
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@ ldm ry!, {lower_list}
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@ ldm ry , {upper_list}
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@ This case reverses the load order
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ldmdb.w r0, {r1-r9, pc}
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@ LDM CASE #8 (used when pc is in not in reglist)
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@ ldmdb rx!, {...} ->
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@ ldm rx!, {upper_list}
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@ ldm rx!, {lower_list}
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@ b.w
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ldmdb.w r0!, {r1-r9}
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@ LDM CASE #9 (Used when pc is in reglist)
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@ ldmdb rx!, {...} ->
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@ sub rx, rx, #size (lower_list + upper_list)
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@ mov ry, rx where ry is the lowest register from upper_list
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@ ldm ry!, {lower_list}
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@ ldm ry , {upper_list}
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ldmdb.w r0!, {r1-r9, pc}
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@ POP CASE #1 (list does not include pc)
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@ pop {...} -> pop {lower_list} pop {upper_list}
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@ b.w
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pop {r0-r9}
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@ POP CASE #2 (list includes PC)
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@ pop {...} -> pop {lower_list} pop {upper_list}
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pop {r0-r9, pc}
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