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