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README: document SE K2x0 addition
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 21 Dec 2023 21:44:43 +0000
parents 92470e5d0b9e
children
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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.
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106 @ It *could* be invalid.
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107 cmp r11,#RAM_LOW
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108 blt nostack
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109 mov r0,#RAM_HIGH
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110 sub r0,r0,#XDUMP_STACK_SIZE
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111 cmp r11,r0
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112 bge nostack
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113
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114 stack_range:
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115 ldmfd r11!,{r0-r9} @ copy ten stack words..
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116 stmia r12!,{r0-r9}
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117 ldmfd r11!,{r0-r9} @ copy ten stack words..
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118 stmia r12!,{r0-r9}
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119
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120 nostack:
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121 @ we're finished saving all state.
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122 @ Now execute C code for more flexibility.
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123 @ set up a stack for this C call
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124 ldr sp,=_Stack_segment_end
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125 b dar_reset