[caf88699] | 1 | #include "../startup/swi.h" |
---|
| 2 | |
---|
| 3 | /* ANSI concatenation macros. */ |
---|
| 4 | #define CONCAT(a, b) CONCAT2(a, b) |
---|
| 5 | #define CONCAT2(a, b) a ## b |
---|
| 6 | |
---|
| 7 | #ifdef __USER_LABEL_PREFIX__ |
---|
| 8 | #define FUNCTION( name ) CONCAT (__USER_LABEL_PREFIX__, name) |
---|
| 9 | #else |
---|
| 10 | #error __USER_LABEL_PREFIX is not defined |
---|
| 11 | #endif |
---|
| 12 | |
---|
| 13 | /* .text is used instead of .section .text so it works with arm-aout too. */ |
---|
| 14 | .text |
---|
| 15 | .code 32 |
---|
| 16 | .align 0 |
---|
| 17 | |
---|
| 18 | .global _mainCRTStartup |
---|
| 19 | .global _start |
---|
| 20 | .global start |
---|
| 21 | start: |
---|
| 22 | _start: |
---|
| 23 | _mainCRTStartup: |
---|
| 24 | |
---|
| 25 | /* Start by setting up a stack */ |
---|
| 26 | #ifdef ARM_RDP_MONITOR |
---|
| 27 | /* Issue Demon SWI to read stack info */ |
---|
| 28 | swi SWI_GetEnv /* Returns command line in r0 */ |
---|
| 29 | mov sp,r1 /* and the highest memory address in r1 */ |
---|
| 30 | ldr sl, .LC2 /* stack limit is at end of data */ |
---|
| 31 | add sl, sl, #256 /* allow slop for stack overflow handling */ |
---|
| 32 | /* and small frames */ |
---|
| 33 | #else |
---|
| 34 | #ifdef ARM_RDI_MONITOR |
---|
| 35 | /* Issue Angel SWI to read stack info */ |
---|
| 36 | mov r0, #AngelSWI_Reason_HeapInfo |
---|
| 37 | adr r1, .LC0 /* point at ptr to 4 words to receive data */ |
---|
| 38 | swi AngelSWI_ARM /* We are always in ARM mode for startup */ |
---|
| 39 | ldr r0, .LC0 /* point at values read */ |
---|
| 40 | ldr sp, [r0, #8] |
---|
| 41 | ldr sl, [r0, #12] |
---|
| 42 | add sl, sl, #256 /* allow slop for stack overflow handling */ |
---|
| 43 | /* and small frames */ |
---|
| 44 | #else |
---|
| 45 | /* Set up the stack pointer to a fixed value */ |
---|
| 46 | ldr r3, .LC0 |
---|
| 47 | mov sp, r3 |
---|
| 48 | /* Setup a default stack-limit in-case the code has been |
---|
| 49 | compiled with "-mapcs-stack-check". Hard-wiring this value |
---|
| 50 | is not ideal, since there is currently no support for |
---|
| 51 | checking that the heap and stack have not collided, or that |
---|
| 52 | this default 64k is enough for the program being executed. |
---|
| 53 | However, it ensures that this simple crt0 world will not |
---|
| 54 | immediately cause an overflow event: */ |
---|
| 55 | sub sl, sp, #64 << 10 /* Still assumes 256bytes below sl */ |
---|
| 56 | #endif |
---|
| 57 | #endif |
---|
| 58 | mov a2, #0 /* Second arg: fill value */ |
---|
| 59 | mov fp, a2 /* Null frame pointer */ |
---|
| 60 | mov r7, a2 /* Null frame pointer for Thumb */ |
---|
| 61 | |
---|
| 62 | ldr a1, .LC1 /* First arg: start of memory block */ |
---|
| 63 | ldr a3, .LC2 |
---|
| 64 | sub a3, a3, a1 /* Third arg: length of block */ |
---|
| 65 | |
---|
| 66 | |
---|
| 67 | #ifdef __thumb__ /* Enter Thumb mode.... */ |
---|
| 68 | |
---|
| 69 | add a4, pc, #1 /* Get the address of the Thumb block */ |
---|
| 70 | bx a4 /* Go there and start Thumb decoding */ |
---|
| 71 | |
---|
| 72 | .code 16 |
---|
| 73 | .global __change_mode |
---|
| 74 | .thumb_func |
---|
| 75 | __change_mode: |
---|
| 76 | #endif |
---|
| 77 | |
---|
| 78 | bl FUNCTION (memset) |
---|
| 79 | #if !defined (ARM_RDP_MONITOR) && !defined (ARM_RDI_MONITOR) |
---|
| 80 | mov r0, #0 /* no arguments */ |
---|
| 81 | mov r1, #0 /* no argv either */ |
---|
| 82 | #else |
---|
| 83 | /* Need to set up standard file handles */ |
---|
| 84 | bl FUNCTION (initialize_monitor_handles) |
---|
| 85 | |
---|
| 86 | #ifdef ARM_RDP_MONITOR |
---|
| 87 | swi SWI_GetEnv /* sets r0 to point to the command line */ |
---|
| 88 | mov r1, r0 |
---|
| 89 | #else |
---|
| 90 | mov r0, #AngelSWI_Reason_GetCmdLine |
---|
| 91 | adr r1, .LC30 /* Space for command line */ |
---|
| 92 | swi AngelSWI |
---|
| 93 | ldr r1, .LC30 |
---|
| 94 | #endif |
---|
| 95 | /* Parse string at r1 */ |
---|
| 96 | mov r0, #0 /* count of arguments so far */ |
---|
| 97 | .LC10: |
---|
| 98 | /* Skip leading blanks */ |
---|
| 99 | #ifdef __thumb__ |
---|
| 100 | ldrb r3, [r1] |
---|
| 101 | add r1, #1 |
---|
| 102 | #else |
---|
| 103 | ldrb r3, [r1], #1 |
---|
| 104 | #endif |
---|
| 105 | cmp r3, #0 |
---|
| 106 | beq .LC12 |
---|
| 107 | cmp r3, #' ' |
---|
| 108 | beq .LC10 |
---|
| 109 | |
---|
| 110 | /* See whether we are scanning a string */ |
---|
| 111 | cmp r3, #'"' |
---|
| 112 | #ifdef __thumb__ |
---|
| 113 | beq .LC20 |
---|
| 114 | cmp r3, #'\'' |
---|
| 115 | bne .LC21 |
---|
| 116 | .LC20: |
---|
| 117 | mov r2, r3 |
---|
| 118 | b .LC22 |
---|
| 119 | |
---|
| 120 | .LC21: |
---|
| 121 | mov r2, #' ' /* terminator type */ |
---|
| 122 | sub r1, r1, #1 /* adjust back to point at start char */ |
---|
| 123 | .LC22: |
---|
| 124 | #else |
---|
| 125 | cmpne r3, #'\'' |
---|
| 126 | moveq r2, r3 |
---|
| 127 | movne r2, #' ' /* terminator type */ |
---|
| 128 | subne r1, r1, #1 /* adjust back to point at start char */ |
---|
| 129 | #endif |
---|
| 130 | |
---|
| 131 | /* Stack a pointer to the current argument */ |
---|
| 132 | #ifdef __thumb__ |
---|
| 133 | push {r1} |
---|
| 134 | #else |
---|
| 135 | stmfd sp!, {r1} |
---|
| 136 | #endif |
---|
| 137 | add r0, r0, #1 |
---|
| 138 | .LC11: |
---|
| 139 | #ifdef __thumb__ |
---|
| 140 | ldrb r3, [r1] |
---|
| 141 | add r1, #1 |
---|
| 142 | #else |
---|
| 143 | ldrb r3, [r1], #1 |
---|
| 144 | #endif |
---|
| 145 | cmp r3, #0 |
---|
| 146 | beq .LC12 |
---|
| 147 | cmp r2, r3 /* reached terminator? */ |
---|
| 148 | bne .LC11 |
---|
| 149 | mov r2, #0 |
---|
| 150 | sub r3, r1, #1 |
---|
| 151 | strb r2, [r3] /* terminate the arg string */ |
---|
| 152 | b .LC10 |
---|
| 153 | |
---|
| 154 | .LC12: |
---|
| 155 | mov r1, sp /* point at stacked arg pointers */ |
---|
| 156 | /* We've now got the stacked args in order reverse the */ |
---|
| 157 | #ifdef __thumb__ |
---|
| 158 | mov r2, r0 |
---|
| 159 | lsl r2, #2 |
---|
| 160 | add r2, sp |
---|
| 161 | mov r3, sp |
---|
| 162 | .LC15: cmp r2, r3 |
---|
| 163 | bls .LC14 |
---|
| 164 | sub r2, #4 |
---|
| 165 | ldr r4, [r2] |
---|
| 166 | ldr r5, [r3] |
---|
| 167 | str r5, [r2] |
---|
| 168 | str r4, [r3] |
---|
| 169 | add r3, #4 |
---|
| 170 | b .LC15 |
---|
| 171 | .LC14: |
---|
| 172 | #else |
---|
| 173 | add r2, sp, r0, LSL #2 /* End of args */ |
---|
| 174 | mov r3, sp /* Start of args */ |
---|
| 175 | .LC13: cmp r2, r3 |
---|
| 176 | ldrhi r4,[r2, #-4] /* Reverse ends of list */ |
---|
| 177 | ldrhi r5, [r3] |
---|
| 178 | strhi r5, [r2, #-4]! |
---|
| 179 | strhi r4, [r3], #4 |
---|
| 180 | bhi .LC13 |
---|
| 181 | #endif |
---|
| 182 | |
---|
| 183 | #endif |
---|
| 184 | bl FUNCTION (main) |
---|
| 185 | |
---|
| 186 | bl FUNCTION (exit) /* Should not return */ |
---|
| 187 | |
---|
| 188 | #ifdef __thumb__ |
---|
| 189 | /* Come out of Thumb mode... This code should be redundant... */ |
---|
| 190 | |
---|
| 191 | mov a4, pc |
---|
| 192 | bx a4 |
---|
| 193 | |
---|
| 194 | .code 32 |
---|
| 195 | .global change_back |
---|
| 196 | change_back: |
---|
| 197 | /* Halt the execution. This code should never be executed. */ |
---|
| 198 | /* |
---|
| 199 | ** With no debug monitor, this probably aborts (eventually). |
---|
| 200 | ** With a Demon debug monitor, this halts cleanly. |
---|
| 201 | ** With an Angel debug monitor, this will report 'Unknown SWI'. |
---|
| 202 | */ |
---|
| 203 | swi SWI_Exit |
---|
| 204 | #endif |
---|
| 205 | |
---|
| 206 | /* For Thumb, constants must be after the code since only |
---|
| 207 | positive offsets are supported for PC relative addresses. */ |
---|
| 208 | |
---|
| 209 | .align 0 |
---|
| 210 | .LC0: |
---|
| 211 | #ifdef ARM_RDI_MONITOR |
---|
| 212 | .word HeapBase |
---|
| 213 | #else |
---|
| 214 | #ifndef ARM_RDP_MONITOR |
---|
| 215 | #ifdef __pe__ |
---|
| 216 | .word 0x800000 |
---|
| 217 | #else |
---|
| 218 | /* .word 0x80000 */ /* Top of RAM on the PIE board */ |
---|
| 219 | #endif |
---|
| 220 | #endif |
---|
| 221 | #endif |
---|
| 222 | .LC1: |
---|
| 223 | .word _clear_start |
---|
| 224 | .LC2: |
---|
| 225 | .word _clear_end |
---|
| 226 | |
---|
| 227 | #ifdef ARM_RDI_MONITOR |
---|
| 228 | .LC30: .word CommandLine |
---|
| 229 | |
---|
| 230 | /* Workspace for Angel calls. */ |
---|
| 231 | .data |
---|
| 232 | /* Data returned by monitor SWI */ |
---|
| 233 | HeapBase: .word 0 |
---|
| 234 | HeapLimit: .word 0 |
---|
| 235 | StackBase: .word 0 |
---|
| 236 | StackLimit: .word 0 |
---|
| 237 | CommandLine: .space 256,0 /* Maximum length of 255 chars handled */ |
---|
| 238 | #endif |
---|
| 239 | |
---|
| 240 | #ifdef __pe__ |
---|
| 241 | .section .idata$3 |
---|
| 242 | .long 0,0,0,0,0,0,0,0 |
---|
| 243 | #endif |
---|
| 244 | |
---|