{"id":1765,"date":"2013-07-12T18:55:33","date_gmt":"2013-07-12T13:25:33","guid":{"rendered":"http:\/\/www.e-consystems.com\/blog\/windowsce\/?p=945"},"modified":"2023-08-15T12:34:27","modified_gmt":"2023-08-15T07:04:27","slug":"wec-2013-thumb2-arm-pre-ual-syntax-and-its-equivalent-ual-syntax","status":"publish","type":"post","link":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wec-2013-thumb2-arm-pre-ual-syntax-and-its-equivalent-ual-syntax\/","title":{"rendered":"Resolving compilation issues in WEC2013 porting – Part1"},"content":{"rendered":"

As a continuation of the WEC 2013 \u2013 THUMB2 porting considerations<\/a> article, I would like to share few more considerations during THUMB2 porting specifically during compilation, assembler will through an error \u201cpre UAL syntax not allowed\u201d frequently in earlier CE version BSPs. I have listed the pre UAL syntax instruction and its equivalent for replacement. Below instruction list prepared based on compilation issues faced during WEC2013 porting on TI EVM DM37x BSP.<\/p>\n

<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Pre UAL syntax mnemonic<\/strong><\/p>\n<\/td>\n

\n

UAL syntax mnemonic<\/strong><\/p>\n<\/td>\n

\n

Remarks<\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

ldrmib r1, [r6], #1<\/p>\n

strmib r1, [r4], #1<\/p>\n

ldrgeb r1, [r6, #1]<\/p>\n

ldrgtb <\/span>r2, [r6, #2]<\/p>\n

strgeh r1, [r4, #4]
\nstrgth r2, [r4, #4]<\/p>\n

ldrneh r2, [r6]<\/p>\n

strneh r2, [r4]<\/p>\n

bicnes r10,r11, #7<\/p>\n<\/td>\n

\n

ldrbmi r1, [r6], #1<\/p>\n

strbmi r1, [r4], #1<\/p>\n

ldrbge r1, [r6, #1]<\/p>\n

ldrbgt <\/span>r2, [r6, #2]<\/p>\n

strhge r1, [r4, #4]
\nstrhgt r2, [r4, #4]<\/p>\n

ldrhne r2, [r6]<\/p>\n

strhne r2, [r4]<\/p>\n

bicsne r10,r11, #7<\/p>\n<\/td>\n

\n

Before each instruction, \u201cIT\u201d instruction has to be added. But it is automatically added by WEC2013 assembler. You can see the .lst file of the corresponding .s file.<\/p>\n<\/td>\n<\/tr>\n

\n

Stmdb sp! {r3-r12, lr}<\/p>\n

ldmia sp!, { r3-r12, lr}<\/p>\n

stmdb sp!, {r3}<\/p>\n

ldmia sp! , {r3}<\/p>\n<\/td>\n

\n

push {r3 \u2013 r12, lr}<\/p>\n

pop { r3 \u2013 r12, lr}<\/p>\n

push {r3}<\/p>\n

pop {r3}<\/p>\n<\/td>\n

\n

If you are not changing the stmdb, ldmia to push and pop respectively, assembler is doing it automatically. You can see this in the .lst file<\/p>\n

Passing single register operant to stmdb and ldmia is strictly not allowed. You have to replace with push and pop<\/p>\n<\/td>\n<\/tr>\n

\n

Stmia r0!, { r7 \u2013 r14}<\/p>\n<\/td>\n

\n

Stmia r0!, { r7 \u2013r12}<\/p>\n

Mov r1, sp<\/p>\n

Stmia r0! , {r1}<\/p>\n

Mov r1, lr<\/p>\n

Stmia r0! {r1}<\/p>\n<\/td>\n

\n

You can\u2019t access sp,lr and pc registers directly through stmia instruction<\/p>\n<\/td>\n<\/tr>\n

\n

ldmia r0!, {r7 – r14}<\/p>\n<\/td>\n

\n

Ldmia r0!, {r7 \u2013 r12}<\/p>\n

Ldmia r0!, {r1}<\/p>\n

Mov sp, r1<\/p>\n

Ldmia r0!, {r1}<\/p>\n

Mov lr, r1<\/p>\n<\/td>\n

\n

You can\u2019t access sp,lr and pc registers directly through ldmia instruction<\/p>\n<\/td>\n<\/tr>\n

\n

Orr r11,r10,r9, lsl r5<\/p>\n

Orr r11,r11,r7, lsl r2<\/p>\n<\/td>\n

\n

Lsl r9, r5<\/p>\n

Orr r11,r10, r6<\/p>\n

Lsl r6, r7, r2<\/p>\n

Orr r11, r11, r6<\/p>\n<\/td>\n

\n

You can\u2019t combine the orr and lsl operation in a single <\/span>instruction.<\/p>\n<\/td>\n<\/tr>\n

\n

DCD WFI<\/p>\n

DCD SMI<\/p>\n<\/td>\n

\n

Wfi<\/p>\n

SMCEQ #0<\/p>\n<\/td>\n

\n

Assembler doesn\u2019t support a particular instruction by hard coding opcodes.<\/p>\n<\/td>\n<\/tr>\n

\n

and r6, pc, r5<\/p>\n<\/td>\n

\n

mov r7, pc<\/p>\n

and r6, r7, r5<\/p>\n<\/td>\n

\n

Can\u2019t do arithmetic with pc directly<\/p>\n<\/td>\n<\/tr>\n

\n

addne r11,pc #g_AdrTable- (.+8)<\/p>\n<\/td>\n

\n

adrne r11, g_Adrtable<\/p>\n<\/td>\n

\n

This kind of implementation not supported in Thumb2 mode<\/p>\n<\/td>\n<\/tr>\n

\n

bic r1, r2, r2<\/p>\n<\/td>\n

\n

bic r1, r2<\/p>\n<\/td>\n

\n

THUMB2 mode replacement for bic<\/p>\n<\/td>\n<\/tr>\n

\n

cmp <\/span>r9, #OEM_HIGH_SECURITY_HS<\/p>\n

moveq <\/span>r0, #OEM_HIGH_SECURITY_HS<\/p>\n

movne <\/span>r0, #OEM_HIGH_SECURITY_GP<\/p>\n<\/td>\n

\n

cmp <\/span>r9, #1<\/p>\n

moveq <\/span>r0, #1<\/p>\n

movne <\/span>r0, #2<\/p>\n<\/td>\n

\n

Expected absolute numeric value<\/p>\n<\/td>\n<\/tr>\n

\n

fstmiad r0!, {d0-d15}<\/span><\/em><\/p>\n

fldmiad r0!, {d0-d15}<\/span><\/em><\/p>\n<\/td>\n

\n

vstmia.64 r0!, { d0-d15}<\/p>\n

vldmia.64 r0!, { d0-d15}<\/span><\/em><\/p>\n<\/td>\n

\n

UAL mnemonic for VFP instruction Load and store multiple<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

Hope this will help you to resolve the pre UAL and UAL changes in WEC 2013.<\/p>\n

\n

<\/p>\n

Stmdb sp! {r3-r12, lr}<\/p>\n

ldmia sp!, { r3-r12, lr}<\/p>\n

stmdb sp!, {r3}<\/p>\n

ldmia sp! , {r3}<\/span> <\/p>\n<\/div>\n

Click here to continue reading Part2<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

As a continuation of the WEC 2013 \u2013 THUMB2 porting considerations article, I would like…<\/p>\n","protected":false},"author":12,"featured_media":1231,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[216],"tags":[273,287,300,320],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/posts\/1765"}],"collection":[{"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/comments?post=1765"}],"version-history":[{"count":1,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/posts\/1765\/revisions"}],"predecessor-version":[{"id":2929,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/posts\/1765\/revisions\/2929"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/media\/1231"}],"wp:attachment":[{"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/media?parent=1765"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/categories?post=1765"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.e-consystems.com\/blog\/system-on-module-som\/wp-json\/wp\/v2\/tags?post=1765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}