diff options
Diffstat (limited to 'arch/mips/cpu/start.S')
| -rw-r--r-- | arch/mips/cpu/start.S | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S index d01ee9f9bd..952c57afd7 100644 --- a/arch/mips/cpu/start.S +++ b/arch/mips/cpu/start.S @@ -221,18 +221,6 @@ wr_done: ehb #endif - /* - * Initialize $gp, force pointer sized alignment of bal instruction to - * forbid the compiler to put nop's between bal and _gp. This is - * required to keep _gp and ra aligned to 8 byte. - */ - .align PTRLOG - bal 1f - nop - PTR _gp -1: - PTR_L gp, 0(ra) - #ifdef CONFIG_MIPS_CM PTR_LA t9, mips_cm_map jalr t9 @@ -291,121 +279,3 @@ wr_done: move ra, zero END(_start) - -/* - * void relocate_code (addr_sp, gd, addr_moni) - * - * This "function" does not return, instead it continues in RAM - * after relocating the monitor code. - * - * a0 = addr_sp - * a1 = gd - * a2 = destination address - */ -ENTRY(relocate_code) - move sp, a0 # set new stack pointer - move fp, sp - - move s0, a1 # save gd in s0 - move s2, a2 # save destination address in s2 - - PTR_LI t0, CONFIG_SYS_MONITOR_BASE - PTR_SUB s1, s2, t0 # s1 <-- relocation offset - - PTR_LA t2, __image_copy_end - move t1, a2 - - /* - * t0 = source address - * t1 = target address - * t2 = source end address - */ -1: - PTR_L t3, 0(t0) - PTR_S t3, 0(t1) - PTR_ADDU t0, PTRSIZE - blt t0, t2, 1b - PTR_ADDU t1, PTRSIZE - - /* - * Now we want to update GOT. - * - * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object - * generated by GNU ld. Skip these reserved entries from relocation. - */ - PTR_LA t3, num_got_entries - PTR_LA t8, _GLOBAL_OFFSET_TABLE_ - PTR_ADD t8, s1 # t8 now holds relocated _G_O_T_ - PTR_ADDIU t8, t8, 2 * PTRSIZE # skipping first two entries - PTR_LI t2, 2 -1: - PTR_L t1, 0(t8) - beqz t1, 2f - PTR_ADD t1, s1 - PTR_S t1, 0(t8) -2: - PTR_ADDIU t2, 1 - blt t2, t3, 1b - PTR_ADDIU t8, PTRSIZE - - /* Update dynamic relocations */ - PTR_LA t1, __rel_dyn_start - PTR_LA t2, __rel_dyn_end - - b 2f # skip first reserved entry - PTR_ADDIU t1, 2 * PTRSIZE - -1: - lw t8, -4(t1) # t8 <-- relocation info - - PTR_LI t3, MIPS_RELOC - bne t8, t3, 2f # skip non-MIPS_RELOC entries - nop - - PTR_L t3, -(2 * PTRSIZE)(t1) # t3 <-- location to fix up in FLASH - - PTR_L t8, 0(t3) # t8 <-- original pointer - PTR_ADD t8, s1 # t8 <-- adjusted pointer - - PTR_ADD t3, s1 # t3 <-- location to fix up in RAM - PTR_S t8, 0(t3) - -2: - blt t1, t2, 1b - PTR_ADDIU t1, 2 * PTRSIZE # each rel.dyn entry is 2*PTRSIZE bytes - - /* - * Flush caches to ensure our newly modified instructions are visible - * to the instruction cache. We're still running with the old GOT, so - * apply the reloc offset to the start address. - */ - PTR_LA a0, __text_start - PTR_LA a1, __text_end - PTR_SUB a1, a1, a0 - PTR_LA t9, flush_cache - jalr t9 - PTR_ADD a0, s1 - - PTR_ADD gp, s1 # adjust gp - - /* - * Clear BSS - * - * GOT is now relocated. Thus __bss_start and __bss_end can be - * accessed directly via $gp. - */ - PTR_LA t1, __bss_start # t1 <-- __bss_start - PTR_LA t2, __bss_end # t2 <-- __bss_end - -1: - PTR_S zero, 0(t1) - blt t1, t2, 1b - PTR_ADDIU t1, PTRSIZE - - move a0, s0 # a0 <-- gd - move a1, s2 - PTR_LA t9, board_init_r - jr t9 - move ra, zero - - END(relocate_code) |