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Last change
on this file since 544 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.9 KB
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| 1 | # NEC V850 startup code |
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| 2 | |
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| 3 | .section .text |
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| 4 | .global _start |
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| 5 | |
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| 6 | _start: |
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| 7 | |
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| 8 | #if defined(__v850e__) || defined(__v850e2__) || defined(__v850e2v3__) || defined(__v850e3v5__) |
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| 9 | |
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| 10 | movea 255, r0, r20 |
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| 11 | mov 65535, r21 |
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| 12 | mov hilo(_stack), sp |
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| 13 | mov hilo(__ep), ep |
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| 14 | mov hilo(__gp), gp |
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| 15 | mov hilo(__ctbp), r6 |
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| 16 | ldsr r6, ctbp |
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| 17 | #if defined(__v850e2v3__) || defined(__v850e3v5__) |
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| 18 | // FPU enable |
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| 19 | stsr psw, r6 |
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| 20 | movhi 1, r0, r7 |
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| 21 | or r7, r6 |
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| 22 | ldsr r6, psw |
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| 23 | // Initialize the FPSR |
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| 24 | movhi 2, r0, r6 |
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| 25 | ldsr r6, fpsr |
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| 26 | #endif |
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| 27 | // FIXME: We currently assume that the data sections |
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| 28 | // are loaded in place - ie that they do not need to |
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| 29 | // moved from eg ROM into RAM. If that is not true |
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| 30 | // then extra code needs to be added here. |
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| 31 | |
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| 32 | // Initialise the .bss section. |
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| 33 | mov hilo(_edata), r6 |
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| 34 | mov hilo(_end), r7 |
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| 35 | .L0: |
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| 36 | st.w r0, 0[r6] |
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| 37 | addi 4, r6, r6 |
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| 38 | cmp r7, r6 |
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| 39 | bl .L0 |
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| 40 | .L1: |
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| 41 | jarl ___main, r31 |
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| 42 | addi -16, sp, sp |
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| 43 | mov 0, r6 |
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| 44 | mov 0, r7 |
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| 45 | mov 0, r8 |
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| 46 | jarl _main, r31 |
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| 47 | mov r10, r6 |
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| 48 | jarl _exit, r31 |
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| 49 | |
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| 50 | # else |
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| 51 | movea 255, r0, r20 |
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| 52 | mov r0, r21 |
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| 53 | ori 65535, r0, r21 |
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| 54 | movhi hi(_stack), r0, sp |
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| 55 | movea lo(_stack), sp, sp |
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| 56 | movhi hi(__ep), r0, ep |
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| 57 | movea lo(__ep), ep, ep |
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| 58 | movhi hi(__gp), r0, gp |
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| 59 | movea lo(__gp), gp, gp |
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| 60 | |
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| 61 | // FIXME: See note about not moving the data sections above. |
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| 62 | |
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| 63 | // Initialise the .bss section. |
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| 64 | movhi hi(_edata), r0, r6 |
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| 65 | movea lo(_edata), r6, r6 |
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| 66 | movhi hi(_end), r0, r7 |
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| 67 | movea lo(_end), r7, r7 |
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| 68 | .L0: |
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| 69 | st.b r0, 0[r6] |
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| 70 | addi 1, r6, r6 |
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| 71 | cmp r7, r6 |
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| 72 | bl .L0 |
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| 73 | .L1: |
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| 74 | jarl ___main, r31 |
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| 75 | addi -16, sp, sp |
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| 76 | mov 0, r6 |
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| 77 | mov 0, r7 |
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| 78 | mov 0, r8 |
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| 79 | jarl _main, r31 |
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| 80 | mov r10, r6 |
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| 81 | jarl _exit, r31 |
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| 82 | # endif |
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| 83 | |
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| 84 | .section .stack |
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| 85 | _stack: .long 1 |
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| 86 | |
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| 87 | .section .data |
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| 88 | .global ___dso_handle |
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| 89 | .weak ___dso_handle |
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| 90 | ___dso_handle: |
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| 91 | .long 0 |
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