FreeCalypso > hg > fc-tourmaline
annotate src/cs/system/main/gcc/exceptions.S @ 214:adfdbcd360fd
backlight evolution: API between Condat driver and MFW
With this change, the API between the Condat backlight driver
and its user in MFW now carries more abstract backlight state codes
(fully off, fully on, in call, charging boot mode) instead of
0-255 levels. This change is needed in order to more properly support
different hardware targets with different capabilities and approaches
in terms of backlight handling.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 23 Apr 2021 23:52:02 +0000 |
parents | 4e78acac3d88 |
children |
rev | line source |
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0
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1 /* |
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2 * This module contains ARM exception handlers which used to be |
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3 * in chipsetsw/system/Main/int.s in TI's original version. |
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4 */ |
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5 |
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6 .text |
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7 .code 32 |
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8 |
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9 @ layout of xdump buffer: |
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10 @ struct xdump_s { |
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11 @ long registers[16] // svc mode registers |
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12 @ long cpsr // svc mode CPSR |
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13 @ long exception // magic word + index of vector taken |
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14 @ long stack[20] // bottom 20 words of usr mode stack |
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15 @ } |
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16 |
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17 .globl _arm_undefined |
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18 _arm_undefined: |
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19 @ store r12 for Xdump_buffer pointer, r11 for index |
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20 stmfd r13!,{r11,r12} |
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21 mov r11,#1 |
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22 b save_regs |
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23 |
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24 .globl _arm_swi |
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25 _arm_swi: |
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26 @ store r12 for Xdump_buffer pointer, r11 for index |
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27 stmfd r13!,{r11,r12} |
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28 mov r11,#2 |
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29 b save_regs |
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30 |
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31 .globl _arm_abort_prefetch |
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32 _arm_abort_prefetch: |
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33 @ store r12 for Xdump_buffer pointer, r11 for index |
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34 stmfd r13!,{r11,r12} |
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35 mov r11,#3 |
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36 b save_regs |
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37 |
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38 .globl _arm_abort_data |
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39 _arm_abort_data: |
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40 @ store r12 for Xdump_buffer pointer, r11 for index |
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41 stmfd r13!,{r11,r12} |
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42 mov r11,#4 |
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43 b save_regs |
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44 |
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45 .globl _arm_reserved |
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46 _arm_reserved: |
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47 ldr r13,=_Except_Stack_SP @ mode unknown |
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48 @ store r12 for Xdump_buffer pointer, r11 for index |
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49 stmfd r13!,{r11,r12} |
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50 mov r11,#5 |
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51 b save_regs |
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52 |
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53 save_regs: |
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54 ldr r12,=xdump_buffer |
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55 str r14,[r12,#4*15] @ save r14_abt (original PC) into r15 slot |
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56 |
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57 stmia r12,{r0-r10} @ save unbanked registers (except r11 and r12) |
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58 ldmfd r13!,{r0,r1} @ get original r11 and r12 |
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59 str r0,[r12,#4*11] @ save original r11 |
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60 str r1,[r12,#4*12] @ save original r12 |
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61 mrs r0,spsr @ get original psr |
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62 str r0,[r12,#4*16] @ save original cpsr |
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63 |
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64 mrs r1,cpsr @ save mode psr |
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65 bic r2,r1,#0x1f @ psr with mode bits cleared |
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66 and r0,r0,#0x1f @ get original mode bits |
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67 add r0,r0,r2 |
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68 |
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69 msr cpsr,r0 @ move to pre-exception mode |
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70 str r13,[r12,#4*13] @ save original SP |
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71 str r14,[r12,#4*14] @ save original LR |
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72 msr cpsr,r1 @ restore mode psr |
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73 |
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74 @ r11 has original index |
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75 orr r10,r11,#0xDE<<24 @ r10 = 0xDEAD0000 + index of vector taken |
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76 orr r10,r10,#0xAD<<16 |
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77 str r10,[r12,#4*17] @ save magic + index |
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78 |
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79 mov r0,r11 @ put index into 1st argument |
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80 b dar_exception |
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81 |
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82 @ the second part |
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83 |
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84 /* |
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85 * For the SP-in-RAM validity check, we use the following simplification: |
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86 * it doesn't really matter what the actual IRAM and XRAM sizes are on |
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87 * any given target, as the address decoder hooked up to the ARM7TDMI core |
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88 * always decodes the full 8 MiB address range for each, causing the |
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89 * actual memories to be aliased multiple times in those two ranges. |
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90 * Furthermore, the XRAM address range falls right after the IRAM one, |
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91 * thus we can get away with only a single range check. |
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92 */ |
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93 |
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94 #define RAM_LOW 0x00800000 |
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95 #define RAM_HIGH 0x01800000 |
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96 |
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97 #define XDUMP_STACK_SIZE 20 |
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98 |
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99 .globl exception |
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100 exception: |
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101 ldr r12,=xdump_buffer |
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102 ldr r11,[r12,#4*13] @ get svc mode r13 |
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103 add r12,r12,#4*18 @ base of stack buffer |
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104 |
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105 @ check if svc r13(sp) is within internal/external RAM. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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106 @ It *could* be invalid. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
107 cmp r11,#RAM_LOW |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
108 blt nostack |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
109 mov r0,#RAM_HIGH |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
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110 sub r0,r0,#XDUMP_STACK_SIZE |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
111 cmp r11,r0 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
112 bge nostack |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
113 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
114 stack_range: |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
115 ldmfd r11!,{r0-r9} @ copy ten stack words.. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
116 stmia r12!,{r0-r9} |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
117 ldmfd r11!,{r0-r9} @ copy ten stack words.. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
118 stmia r12!,{r0-r9} |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
119 |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
120 nostack: |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
121 @ we're finished saving all state. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
122 @ Now execute C code for more flexibility. |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
123 @ set up a stack for this C call |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
124 ldr sp,=_Stack_segment_end |
4e78acac3d88
src/{condat,cs,gpf,nucleus}: import from Selenite
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
125 b dar_reset |