2022-06-21 15:16:14 +00:00
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.section .text.init, "ax"
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.global _start
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2022-06-21 01:28:16 +00:00
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_start:
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nop
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2022-06-21 15:16:14 +00:00
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nop
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mov.l stack_k, sp /* Setup R15(SP) */
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copy_data:
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mov.l sidata_k, r0
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mov.l sdata_k, r1
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mov.l edata_k, r2
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loop_copy_data:
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mov.l @r0+, r3 /* Load a word to r3 from [sidata], with post-increment of 4 */
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mov.l r3, @r1 /* Store the word in r3 to [sdata] */
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add #4, r1 /* Increment sdata pointer */
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cmp/ge r1, r2
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bt loop_copy_data
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zero_bss:
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mov.l edata_k, r0
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mov.l end_k, r1
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mov #0, r2
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loop_zero_bss:
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mov.l r2, @r0
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add #4, r0
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cmp/ge r0, r1
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bt loop_zero_bss
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setup_fpu:
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mov.l set_fpscr_k, r1
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jsr @r1
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mov #0, r4
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lds r3, fpscr
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mov.l main_k,r0
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jsr @r0
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or r0, r0
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mov r0, r4
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mov.l exit_k, r0
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jsr @r0
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or r0, r0
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/* It would be more efficient by using indirect addressing instead of 8 instructions... */
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.align 2
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set_fpscr_k:
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.long ___set_fpscr
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stack_k:
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.long _stack
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sidata_k:
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.long _sidata
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sdata_k:
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.long _sdata
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edata_k:
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.long _edata
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end_k:
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.long _end
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main_k:
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.long _main /* Same address as main */
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exit_k:
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.long _exit
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