| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * crt0_r.S: Entry function for SPU-side context restore. |
| * |
| * Copyright (C) 2005 IBM |
| * |
| * Entry and exit function for SPU-side of the context restore |
| * sequence. Sets up an initial stack frame, then branches to |
| * 'main'. On return, restores all 128 registers from the LSCSA |
| * and exits. |
| */ |
| |
| #include <asm/spu_csa.h> |
| |
| .data |
| .align 7 |
| .globl regs_spill |
| regs_spill: |
| .space SIZEOF_SPU_SPILL_REGS, 0x0 |
| |
| .text |
| .global _start |
| _start: |
| /* Initialize the stack pointer to point to 16368 |
| * (16kb-16). The back chain pointer is initialized |
| * to NULL. |
| */ |
| il $0, 0 |
| il $SP, 16368 |
| stqd $0, 0($SP) |
| |
| /* Allocate a minimum stack frame for the called main. |
| * This is needed so that main has a place to save the |
| * link register when it calls another function. |
| */ |
| stqd $SP, -160($SP) |
| ai $SP, $SP, -160 |
| |
| /* Call the program's main function. */ |
| brsl $0, main |
| |
| .global exit |
| .global _exit |
| exit: |
| _exit: |
| /* SPU Context Restore, Step 5: Restore the remaining 112 GPRs. */ |
| ila $3, regs_spill + 256 |
| restore_regs: |
| lqr $4, restore_reg_insts |
| restore_reg_loop: |
| ai $4, $4, 4 |
| .balignl 16, 0x40200000 |
| restore_reg_insts: /* must be quad-word aligned. */ |
| lqd $16, 0($3) |
| lqd $17, 16($3) |
| lqd $18, 32($3) |
| lqd $19, 48($3) |
| andi $5, $4, 0x7F |
| stqr $4, restore_reg_insts |
| ai $3, $3, 64 |
| brnz $5, restore_reg_loop |
| |
| /* SPU Context Restore Step 17: Restore the first 16 GPRs. */ |
| lqa $0, regs_spill + 0 |
| lqa $1, regs_spill + 16 |
| lqa $2, regs_spill + 32 |
| lqa $3, regs_spill + 48 |
| lqa $4, regs_spill + 64 |
| lqa $5, regs_spill + 80 |
| lqa $6, regs_spill + 96 |
| lqa $7, regs_spill + 112 |
| lqa $8, regs_spill + 128 |
| lqa $9, regs_spill + 144 |
| lqa $10, regs_spill + 160 |
| lqa $11, regs_spill + 176 |
| lqa $12, regs_spill + 192 |
| lqa $13, regs_spill + 208 |
| lqa $14, regs_spill + 224 |
| lqa $15, regs_spill + 240 |
| |
| /* Under normal circumstances, the 'exit' function |
| * terminates with 'stop SPU_RESTORE_COMPLETE', |
| * indicating that the SPU-side restore code has |
| * completed. |
| * |
| * However it is possible that instructions immediately |
| * following the 'stop 0x3ffc' have been modified at run |
| * time so as to recreate the exact SPU_Status settings |
| * from the application, e.g. illegal instruciton, halt, |
| * etc. |
| */ |
| .global exit_fini |
| .global _exit_fini |
| exit_fini: |
| _exit_fini: |
| stop SPU_RESTORE_COMPLETE |
| stop 0 |
| stop 0 |
| stop 0 |
| |
| /* Pad the size of this crt0.o to be multiple of 16 bytes. */ |
| .balignl 16, 0x0 |
