Last change
on this file since 474 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
1.6 KB
|
Rev | Line | |
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[444] | 1 | extern int main(int argc, char **argv, char **envp); |
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| 2 | extern int brk (void *value); |
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| 3 | |
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| 4 | extern char bss_start; |
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| 5 | extern char end; |
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| 6 | |
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| 7 | char *__env[1] = {0}; |
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| 8 | char **environ = __env; |
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| 9 | |
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| 10 | #define ENABLE_TRACE_MASK 1 |
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| 11 | |
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| 12 | __inline static void |
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| 13 | enable_tracing (void) |
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| 14 | { |
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| 15 | register int mask = ENABLE_TRACE_MASK; |
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| 16 | __asm__ volatile ("modpc %0,%0,%0" |
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| 17 | : |
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| 18 | : "d" (mask)); |
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| 19 | } |
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| 20 | |
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| 21 | #define STACK_ALIGN 64 |
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| 22 | |
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| 23 | __inline static void |
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| 24 | set_stack (void* ptr) |
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| 25 | { |
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| 26 | ptr = (void *)(((int)ptr + STACK_ALIGN - 1) & ~(STACK_ALIGN - 1)); |
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| 27 | /* SP must be 64 bytes larger than FP at start. */ |
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| 28 | __asm__ volatile ("mov %0,sp" |
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| 29 | : |
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| 30 | : "d" (ptr+STACK_ALIGN)); |
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| 31 | __asm__ volatile ("mov %0,fp" |
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| 32 | : |
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| 33 | : "d" (ptr)); |
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| 34 | } |
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| 35 | |
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| 36 | __inline static void |
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| 37 | init_Cregs (void) |
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| 38 | { |
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| 39 | /* set register values gcc like */ |
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| 40 | register unsigned int mask0=0x3b001000; |
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| 41 | register unsigned int mask1=0x00009107; |
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| 42 | __asm__ volatile ("mov %0,g14" |
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| 43 | : /* no output */ |
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| 44 | : "I" (0)); /* gnu structure pointer */ |
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| 45 | __asm__ volatile ("modac %1,%0,%0" |
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| 46 | : /* no output */ |
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| 47 | : "d" (mask0), |
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| 48 | "d" (mask1)); /* fpu control kb */ |
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| 49 | } |
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| 50 | |
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| 51 | void |
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| 52 | _start(void) |
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| 53 | { |
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| 54 | char *p; |
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| 55 | |
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| 56 | enable_tracing (); |
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| 57 | set_stack (&end); |
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| 58 | init_Cregs (); |
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| 59 | /* The stack grows upwards, so this makes the heap start after a 256K |
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| 60 | stack area. PlumHall known to fail with less than 73K of stack. */ |
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| 61 | brk (&end+0x40000); |
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| 62 | /* clear bss */ |
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| 63 | memset (&bss_start, 0, &end - &bss_start); |
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| 64 | main(0, 0, 0); |
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| 65 | exit(0); |
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| 66 | } |
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