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Merge pull request #10 from dinosaure/better-boot-S
Better boot.S and link script
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,36 +1,19 @@ | ||
| #include <string.h> | ||
| #include <stdint.h> | ||
| #include <stdio.h> | ||
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| #define WT size_t | ||
| #define WS (sizeof(WT)) | ||
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| void *memmove(void *dest, const void *src, size_t n) | ||
| void *memmove(void *v_dst, const void *v_src, size_t len) | ||
| { | ||
| char *d = dest; | ||
| const char *s = src; | ||
| char *dst = v_dst; | ||
| const char *src = v_src; | ||
|
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| if (d==s) return d; | ||
| if (s+n <= d || d+n <= s) return memcpy(d, s, n); | ||
| if (dst == src) return dst; | ||
| if (src + len <= dst || dst + len <= src) return memcpy(dst, src, len) ; | ||
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| if (d<s) { | ||
| if ((uintptr_t)s % WS == (uintptr_t)d % WS) { | ||
| while ((uintptr_t)d % WS) { | ||
| if (!n--) return dest; | ||
| *d++ = *s++; | ||
| } | ||
| for (; n>=WS; n-=WS, d+=WS, s+=WS) *(WT *)d = *(WT *)s; | ||
| } | ||
| for (; n; n--) *d++ = *s++; | ||
| } else { | ||
| if ((uintptr_t)s % WS == (uintptr_t)d % WS) { | ||
| while ((uintptr_t)(d+n) % WS) { | ||
| if (!n--) return dest; | ||
| d[n] = s[n]; | ||
| } | ||
| while (n>=WS) n-=WS, *(WT *)(d+n) = *(WT *)(s+n); | ||
| } | ||
| while (n) n--, d[n] = s[n]; | ||
| } | ||
| if (dst < src) | ||
| for (; len; len--) *dst++ = *src++; | ||
| else | ||
| while (len) len--, dst[len] = src[len]; | ||
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| return dest; | ||
| return dst; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,27 +1,36 @@ | ||
| // AArch64 mode | ||
| .macro ADR_REL register, symbol | ||
| adrp \register, \symbol | ||
| add \register, \register, #:lo12:\symbol | ||
| .endm | ||
|
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||
| // To keep this in the first portion of the binary. | ||
| .section ".text.boot" | ||
| .globl _start | ||
| .equ _core_id_mask, 0b11 | ||
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| .section .text._start | ||
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| // Entry point for the kernel. Registers: | ||
| // x0 -> 32 bit pointer to DTB in memory (primary core only) / 0 (secondary cores) | ||
| // x1 -> 0 | ||
| // x2 -> 0 | ||
| // x3 -> 0 | ||
| // x4 -> 32 bit kernel entry point, _start location | ||
| _start: | ||
| mov sp, #0x30000000 | ||
| mrs x1, MPIDR_EL1 | ||
| and x1, x1, _core_id_mask | ||
| mov x2, #0 | ||
| cmp x1, x2 | ||
| b.ne .L_parking_loop | ||
| .L_bss_init_loop: | ||
| ADR_REL x0, __bss_start | ||
| ADR_REL x1, __bss_end_exclusive | ||
| .L_bss_loop: | ||
| cmp x0, x1 | ||
| b.eq .L_prepare_c | ||
| stp xzr, xzr, [x0], #16 | ||
| b .L_bss_loop | ||
| .L_prepare_c: | ||
| ADR_REL x0, __boot_core_stack_end_exclusive | ||
| mov sp, x0 | ||
| .L_jump: | ||
| bl _start_c | ||
| b .L_parking_loop | ||
| .L_parking_loop: | ||
| wfe | ||
| b .L_parking_loop | ||
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| // clear bss | ||
| ldr x5, =__bss_start | ||
| ldr w6, =__bss_size | ||
| 3: cbz w6, 4f | ||
| str xzr, [x5], #8 | ||
| sub w6, w6, #1 | ||
| cbnz w6, 3b | ||
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| // jump to C code, should not return | ||
| 4: bl kernel_main | ||
| 1: wfe | ||
| b 1b | ||
| .size _start, . - _start | ||
| .type _start, function | ||
| .global _start |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,11 +1,3 @@ | ||
| #include <stddef.h> | ||
|
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||
| void *memset(void *dest, int c, size_t n); | ||
| void *memcpy(void *restrict dest, const void *restrict src, size_t n); | ||
| void *memmove(void *dest, const void *src, size_t n); | ||
| int memcmp(const void *vl, const void *vr, size_t n); | ||
| int strcmp(const char *l, const char *r); | ||
| int strncmp(const char *l, const char *r, size_t n); | ||
| char *strcpy(char *restrict dest, const char *restrict src); | ||
| size_t strlen(const char *s); | ||
| int isspace(int c); |
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