62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
#if defined(__aarch64__)
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#include <stdint.h>
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void exit(int8_t status){
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asm ( "mov x0, %0\n" // Move the exit status into register x0
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"mov x8, #93\n" // Syscall number for 'exit' is 93 in AArch64
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"svc #0\n" // Make the syscall
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: // No output operands
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: "r" ((long)status) // Input operand: status
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: "x0", "x8" // Clobbered registers
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);
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for (;;);
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}
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intptr_t write(int32_t fd, const void* buf, intptr_t size){
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intptr_t n_written = 0;
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//register int32_t fd_w asm("w0") = fd;
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asm volatile(
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// Assembly Instructions
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"mov x0, %1\n" // Set x0 to value of fd
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"mov x1, %2\n" // Set x1 to value of buf
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"mov x2, %3\n" // Set x2 to value of size
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"mov x8, #64\n" // Syscall number for 'write' is 64 in AArch64
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"svc #0\n" // Make syscall
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"mov %0, x0\n" // Store return value in n_written
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// Output operands
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: "=r"(n_written)
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// Input operands
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: "r"((int64_t)fd), "r" (buf), "r"(size)
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// Clobbered registers
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: "x0", "x1", "x2", "x8"
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);
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return n_written;
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}
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#define CLONE_CHILD_SETTID 0x1000000
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#define CLONE_CHILD_CLEARTID 0x200000
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uint32_t fork(){
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long int rtn;
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long int flags = CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID;
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asm volatile (
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// Assembly Instructions
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"mov x8, #220\n" // Syscall number for 'clone' is 220 in AArch64
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"mov x0, %1\n" // clone flags
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"mov x1, #0\n" // child stack pointer
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"mov x2, #0\n" // parent_tidptr
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"mov x3, #0\n" // tls
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"mov x4, #0\n" // child_tidptr
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"svc #0\n" // Make the syscall
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"mov %0, x0\n" // save return value
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// Output operands
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: "=r" (rtn)
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// Input operand
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: "r" (flags)
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// Clobbered registers
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: "x0", "x1", "x2", "x3", "x4", "x8"
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);
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return (uint32_t)rtn;
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}
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#endif
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