View source for Ability Usage Checks and MP Reduction

 '''Parameters''' : r4 = Acting unit's data pointer
 
 '''Returns''' : r2 = 0x00 if Action can be taken
           r2 = 0x08 if Unit is in deep water
           r2 = 0x07 if unit can't act
           r2 = 0x05 if unit is a frog attempting to do non frog things
           r2 = 0x03 if unit does not have enough MP (And action menu = default)
           r2 = 0x02 if unit is silenced and [Action menu = default or monster] and [Ability is silencable]
 
 If action menu = default : Store MP used/cost at '''0x801938eb''' (Check Half MP too)
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 0017da20: 27bdffd8 addiu r29,r29,-0x0028    |
 0017da24: afb00018 sw r16,0x0018(r29)       |
 0017da28: 00808021 addu r16,r4,r0           |{{f/adr|<nowiki>r16 = Acting Unit's Data Pointer</nowiki>}}
 0017da2c: afbf0024 sw r31,0x0024(r29)       |
 0017da30: afb20020 sw r18,0x0020(r29)       |
 0017da34: afb1001c sw r17,0x001c(r29)       |
 0017da38: 9202016f lbu r2,0x016f(r16)       |{{f/load|<nowiki>r2 = Acting unit's used skillset</nowiki>}}
 0017da3c: 96110170 lhu r17,0x0170(r16)      |{{f/load|<nowiki>r17 = Acting unit's used ability</nowiki>}}
 0017da40: 3c018006 lui r1,0x8006            |
 0017da44: 00220821 addu r1,r1,r2            |
 0017da48: 90325cb4 lbu r18,0x5cb4(r1)       |{{f/load|<nowiki>r18 = Acting units used action menu</nowiki>}} {{f/std|<nowiki> 0x80065cb4 + skillset offset /80065cb4</nowiki>}}
 0017da4c: 3c028019 lui r2,0x8019            |
 0017da50: 8c42f5f0 lw r2,-0x0a10(r2)        |{{f/adr|<nowiki>r2 = Action type</nowiki>}} {{f/std|<nowiki> 0x8018f5f0 / 8018f5f0</nowiki>}}
 0017da54: 3c018019 lui r1,0x8019            |
 0017da58: a02038eb sb r0,0x38eb(r1)         |{{f/store|<nowiki>Nullify Current ability used MP ( 0x801938eb)</nowiki>}} {{f/std|<nowiki>801938eb</nowiki>}}
 0017da5c: 14400003 bne r2,r0,0x0017da6c     {{f/Cond|<nowiki>If Action type = 0x00 (not reacting)</nowiki>}}
 0017da60: 00000000 nop                           |
 0017da64: 0c0179ea jal 0x0005e7a8                |{{f/jal|Status_infliction/removal%3F|<nowiki>Status Infliction/Removal?</nowiki>}} store CT and remove every status from set 1 (keeps performing if unit is performing) 
 0017da68: 340500ff ori r5,r0,0x00ff              |{{f/std|<nowiki>r5 = 0x0ff</nowiki>}}
 0017da6c: 0c0604c3 jal 0x0018130c           |{{f/jal|Weapon_Guard_Usability|<nowiki>Weapon_Guard_Usability</nowiki>}} Returns r2 = 0x00 if unit can react/evade
 0017da70: 02002021 addu r4,r16,r0           |{{f/std|<nowiki>r4 = Unit's Data Pointer</nowiki>}}
 0017da74: 9203005c lbu r3,0x005c(r16)       |{{f/load|<nowiki>r3 = Acting Unit's Current Statuses 5</nowiki>}}
 0017da78: 00000000 nop                      |
 0017da7c: 30630004 andi r3,r3,0x0004        |{{f/std|<nowiki>r3 = 0x04 if unit has don't act / Else 0x00</nowiki>}}
 0017da80: 10600002 beq r3,r0,0x0017da8c     {{f/Cond|<nowiki>If Acting unit can't act</nowiki>}} /Else branch keeping r2 as returned by above routine
 0017da84: 00000000 nop                           |{{f/std|<nowiki> </nowiki>}}
 0017da88: 34020001 ori r2,r0,0x0001              |{{f/std|<nowiki>r2 = 0x01</nowiki>}}
 0017da8c: 14400047 bne r2,r0,0x0017dbac     {{f/Cond|<nowiki>If unit can act</nowiki>}} /Else branch to {{f/loc|<nowiki>END</nowiki>}}
 0017da90: 24420006 addiu r2,r2,0x0006       |{{f/std|<nowiki>r2 = returned value + 0x06 (0x07 or 0x08)</nowiki>}}
 0017da94: 9202005a lbu r2,0x005a(r16)            |{{f/load|<nowiki>r2 = Acting unit current status 3</nowiki>}}
 0017da98: 00000000 nop                           |
 0017da9c: 30420002 andi r2,r2,0x0002             |{{f/std|<nowiki>r2 = 0x02 if unit is a frog / else 0x00</nowiki>}}
 0017daa0: 1040000e beq r2,r0,0x0017dadc          {{f/Cond|<nowiki>If acting unit is a frog</nowiki>}} /Else avoid frog section
 0017daa4: 00111400 sll r2,r17,0x10                   |
 0017daa8: 00021c03 sra r3,r2,0x10                    |{{f/std|<nowiki>r3 = Used Ability ID</nowiki>}}
 0017daac: 10600005 beq r3,r0,0x0017dac4              {{f/Cond|<nowiki>If used ability <> 0x00</nowiki>}} / If 0x00 branch to skillset check
 0017dab0: 3402016f ori r2,r0,0x016f                      |{{f/std|<nowiki>r2 = 0x16f (frog attack ID)</nowiki>}}
 0017dab4: 10620003 beq r3,r2,0x0017dac4                  {{f/Cond|<nowiki>If Used ability <> Frog Attack</nowiki>}} / if frog attack branch to skillset check
 0017dab8: 3402001d ori r2,r0,0x001d                          |{{f/std|<nowiki>r2 = 0x01d (Frog ID (spell))</nowiki>}}
 0017dabc: 1462003b bne r3,r2,0x0017dbac                      {{f/Cond|<nowiki>If used ability is Frog (checlk skillset)</nowiki>}} /Else branch to {{f/loc|<nowiki>END</nowiki>}} - r2 = 0x05 (frog using illegal action ?)
 0017dac0: 34020005 ori r2,r0,0x0005                          |{{f/std|<nowiki>r2 = 5</nowiki>}}
 0017dac4: 324300ff andi r3,r18,0x00ff                |{{f/std|<nowiki>r3 = Used Action menu</nowiki>}}
 0017dac8: 3402000a ori r2,r0,0x000a                  |{{f/std|<nowiki>r2 = 0x0a</nowiki>}}
 0017dacc: 14620004 bne r3,r2,0x0017dae0              {{f/Cond|<nowiki>If Action menu is aim (charge)</nowiki>}}
 0017dad0: 2e220170 sltiu r2,r17,0x0170               |{{f/std|<nowiki>r2 = 0x01 if ability ID < Potion</nowiki>}}
 0017dad4: 0805f6eb j 0x0017dbac                          {{f/jump|<nowiki>jump to </nowiki>{{f/loc|<nowiki>END</nowiki>}}<nowiki> - with r2 = 0x05 (frog using illegal skillset)</nowiki>}}
 0017dad8: 34020005 ori r2,r0,0x0005                  |{{f/std|<nowiki>r2 = 5</nowiki>}}
 0017dadc: 2e220170 sltiu r2,r17,0x0170           |{{f/std|<nowiki>r2 = 0x01 if ability ID < Potion</nowiki>}}
 0017dae0: 10400031 beq r2,r0,0x0017dba8          {{f/Cond|<nowiki>If Used ability is an ability with data 2 section (< potion)</nowiki>}} /Else branch to {{f/loc|<nowiki>END</nowiki>}} (r2 = 0x00)
 0017dae4: 00111400 sll r2,r17,0x10                   |
 0017dae8: 00021403 sra r2,r2,0x10                    |{{f/std|<nowiki>r2 = Used ability ID</nowiki>}}
 0017daec: 000218c0 sll r3,r2,0x03                    |{{f/std|<nowiki>r3 = Used ability ID * 8</nowiki>}}
 0017daf0: 00621823 subu r3,r3,r2                     |{{f/std|<nowiki>r3 = Used ability ID * 7</nowiki>}}
 0017daf4: 00031840 sll r3,r3,0x01                    |{{f/std|<nowiki>r3 = Used ability ID * 14 (Ability data 2 offset)</nowiki>}}
 0017daf8: 3c028006 lui r2,0x8006                     |
 0017dafc: 2442fbf0 addiu r2,r2,-0x0410               |{{f/std|<nowiki>r2 = 0x8005fbf0 (start of ability data 2)</nowiki>}}
 0017db00: 00622021 addu r4,r3,r2                     |{{f/adr|<nowiki>r4 = Acting unit's last used Ability's Data 2 Pointer</nowiki>}}
 0017db04: 324300ff andi r3,r18,0x00ff                |{{f/std|<nowiki>r3 = Used Action menu</nowiki>}}
 0017db08: 10600003 beq r3,r0,0x0017db18              {{f/Cond|<nowiki>If Used Action menu <> Default</nowiki>}} /Else check silencable abilities
 0017db0c: 34020006 ori r2,r0,0x0006                      |{{f/std|<nowiki>r2 = 0x06 (Monster menu ID)</nowiki>}}
 0017db10: 1462000b bne r3,r2,0x0017db40                  {{f/Cond|<nowiki>If Used Action Menu = Monster</nowiki>}} /Else if menu is not Default nor Monster skip silence checking
 0017db14: 00000000 nop                                       |
 0017db18: 90820005 lbu r2,0x0005(r4)                 {{f/Cond|<nowiki>E </nowiki>}}     |{{f/load|<nowiki>r2 = used Ability data 2 Flags 3</nowiki>}}
 0017db1c: 00000000 nop                                       |
 0017db20: 30420020 andi r2,r2,0x0020                         |{{f/std|<nowiki>r2 = 0x20</nowiki>}}
 0017db24: 10400006 beq r2,r0,0x0017db40                      {{f/Cond|<nowiki>If Ability is affected by silence</nowiki>}} /Else skip silence checking
 0017db28: 00000000 nop                                           |{{f/std|<nowiki> </nowiki>}}
 0017db2c: 92020059 lbu r2,0x0059(r16)                            |{{f/load|<nowiki>r2 = Acting Unit's Current Statuses 2</nowiki>}}
 0017db30: 00000000 nop                                           |
 0017db34: 30420008 andi r2,r2,0x0008                             |{{f/std|<nowiki>r2 = 0x08 if acting unit is silenced / Else 0x00</nowiki>}}
 0017db38: 1440001c bne r2,r0,0x0017dbac                          {{f/Cond|<nowiki>If Unit don't have silence</nowiki>}} /Else if Unit has Silence branch to {{f/loc|<nowiki>END</nowiki>}} - r2 = 0x02
 0017db3c: 34020002 ori r2,r0,0x0002                              |{{f/std|<nowiki>r2 = 0x02</nowiki>}}
 0017db40: 1640001a bne r18,r0,0x0017dbac             {{f/Cond|<nowiki>If Acting unit's used action menu is default</nowiki>}} /If not default branch to {{f/loc|<nowiki>END</nowiki>}} - r2 = 0x00
 0017db44: 00001021 addu r2,r0,r0                     |{{f/std|<nowiki>r2 = 0x00</nowiki>}}
 0017db48: 92030003 lbu r3,0x0003(r16)                    |{{f/load|<nowiki>r3 = Acting Unit's Job ID</nowiki>}}
 0017db4c: 3402005d ori r2,r0,0x005d                      |{{f/std|<nowiki>r2 = 0x5d (mime job ID)</nowiki>}}
 0017db50: 10620016 beq r3,r2,0x0017dbac                  {{f/Cond|<nowiki>If Job is not Mime</nowiki>}} /If unit is a mime branch to {{f/loc|<nowiki>END</nowiki>}} - r2 = 0x00
 0017db54: 00001021 addu r2,r0,r0                         |{{f/std|<nowiki>r2 = 0x00</nowiki>}}
 0017db58: 92020090 lbu r2,0x0090(r16)                        |{{f/load|<nowiki>r2 = Acting Unit's Support 2</nowiki>}}
 0017db5c: 9084000d lbu r4,0x000d(r4)                         |{{f/load|<nowiki>r4 = used Ability's MP Cost</nowiki>}}
 0017db60: 30420080 andi r2,r2,0x0080                         |{{f/std|<nowiki>r2 = 0x80 if Acting unit uses Half MP</nowiki>}}
 0017db64: 10400002 beq r2,r0,0x0017db70                      {{f/Cond|<nowiki>If Unit has Half MP</nowiki>}}
 0017db68: 00000000 nop                                           |
 0017db6c: 00042042 srl r4,r4,0x01                                |{{f/std|<nowiki>r4 = MP cost / 2</nowiki>}}
 0017db70: 3c018019 lui r1,0x8019                             |{{f/std|<nowiki>r1 = 0x80190000</nowiki>}}
 0017db74: a02438eb sb r4,0x38eb(r1)                          |{{f/store|<nowiki>Store MP Used in current ability MP used</nowiki>}}
 0017db78: 8602002c lh r2,0x002c(r16)                         |{{f/load|<nowiki>r2 = Acting unit's current MP</nowiki>}}
 0017db7c: 00000000 nop                                       |
 0017db80: 00402821 addu r5,r2,r0                             |{{f/std|<nowiki>r5 = Acting unit current MP</nowiki>}}
 0017db84: 0044102a slt r2,r2,r4                              |{{f/std|<nowiki>r2 = 0x01 if Unit current MP < Ability MP cost</nowiki>}}
 0017db88: 14400008 bne r2,r0,0x0017dbac                      {{f/Cond|<nowiki>If Unit has enough MP</nowiki>}} /Else not enough MP, branch to {{f/loc|<nowiki>END</nowiki>}} With r2 = 0x03
 0017db8c: 34020003 ori r2,r0,0x0003                          |{{f/std|<nowiki>r2 = 0x03</nowiki>}}
 0017db90: 3c038019 lui r3,0x8019                                 |{{f/std|<nowiki>r3 = 0x80190000</nowiki>}}
 0017db94: 8c63f5fc lw r3,-0x0a04(r3)                             |{{f/adr|<nowiki>r3 = Action state</nowiki>}} {{f/std|<nowiki> 0x8018f5fc / 8018f5fc</nowiki>}}
 0017db98: 34020002 ori r2,r0,0x0002                              |{{f/std|<nowiki>r2 = 0x02</nowiki>}}
 0017db9c: 10620002 beq r3,r2,0x0017dba8                          {{f/Cond|<nowiki>If Action is not in Preview</nowiki>}}
 0017dba0: 00a41023 subu r2,r5,r4                                 |{{f/std|<nowiki>r2 = Acting unit MP - MP cost</nowiki>}}
 0017dba4: a602002c sh r2,0x002c(r16)                             |{{f/store|<nowiki>Store Unit new MP</nowiki>}}
 0017dba8: 00001021 addu r2,r0,r0                '''#E'''           |{{f/std|<nowiki>r2 = 0x00</nowiki>}}
 0017dbac: 8fbf0024 lw r31,0x0024(r29)                        
 0017dbb0: 8fb20020 lw r18,0x0020(r29)                        
 0017dbb4: 8fb1001c lw r17,0x001c(r29)                        
 0017dbb8: 8fb00018 lw r16,0x0018(r29)                        
 0017dbbc: 27bd0028 addiu r29,r29,0x0028                      
 0017dbc0: 03e00008 jr r31                                    
 0017dbc4: 00000000 nop
=== Return locations ===
 '''Battle.bin''' 
 0017ca4c: [[Prep_Current_Action_Data]]
 0017df60: [[Big..._Contains_Hamedo_check]]
 0017e0f0: [[Big..._Contains_Hamedo_check]]
 0017e430: [[Main_reaction_routine%3F]]