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@@ -9,6 +9,8 @@
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* SPDX-License-Identifier: GPL-2.0+
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*/
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+.pic
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+
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#include <asm-offsets.h>
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#include <config.h>
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#include <common.h>
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@@ -116,6 +118,18 @@ IRQ_STACK_START_IN:
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*/
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reset:
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+
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+/*
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+ * gp = ~0 for burn mode
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+ * = ~load_address for load mode
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+ */
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+reset_gp:
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+ .relax_hint 0
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+ sethi $gp, hi20(_GLOBAL_OFFSET_TABLE_-8)
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+ .relax_hint 0
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+ ori $gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_-4)
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+ add5.pc $gp
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+
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set_ivb:
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li $r0, 0x0
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@@ -124,20 +138,31 @@ set_ivb:
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/* set IVIC, vector size: 4 bytes, base: 0x0 */
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mtsr $r0, $ivb
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-load_lli:
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#ifndef CONFIG_SKIP_LOWLEVEL_INIT
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- jal load_lowlevel_init
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- jral $p0
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+ jal lowlevel_init
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+/*
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+ * gp = ~VMA for burn mode
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+ * = ~load_address for load mode
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+ */
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+update_gp:
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+ .relax_hint 0
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+ sethi $gp, hi20(_GLOBAL_OFFSET_TABLE_-8)
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+ .relax_hint 0
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+ ori $gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_-4)
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+ add5.pc $gp
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#endif
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+/*
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+ * do critical initializations first (shall be in short time)
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+ * do self_relocation ASAP.
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+ */
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+
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/*
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* Set the N1213 (Whitiger) core to superuser mode
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* According to spec, it is already when reset
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*/
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-turnoff_wtdog:
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#ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
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- jal load_turnoff_watchdog
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- jral $p0
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+ jal turnoff_watchdog
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#endif
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/*
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@@ -145,7 +170,7 @@ turnoff_wtdog:
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* not when booting from ram
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*/
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#ifdef CONFIG_INIT_CRITICAL
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- bal cpu_init_crit ! Do CPU critical regs init
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+ jal cpu_init_crit ! Do CPU critical regs init
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#endif
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/*
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@@ -174,6 +199,11 @@ call_board_init_f:
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* after relocating the monitor code.
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*
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*/
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+
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+/*
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+ * gp = ~RAM_SIZE - TEXT_SIZE for burn/load mode
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+ */
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+
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.globl relocate_code
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relocate_code:
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move $r4, $r0 /* save addr_sp */
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@@ -184,49 +214,43 @@ relocate_code:
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stack_setup:
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move $sp, $r4
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- la $r0, _start
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-
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+ la $r0, _start@GOTOFF
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beq $r0, $r6, clear_bss /* skip relocation */
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- move $r1, $r6 /* r1 <- scratch for copy_loop */
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- la $r3, __bss_start
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- sub $r3, $r3, $r0 /* r3 <- __bss_start_ofs */
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- add $r2, $r0, $r3 /* r2 <- source end address */
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+ la $r1, _end@GOTOFF
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+ move $r2, $r6 /* r2 <- scratch for copy_loop */
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copy_loop:
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lwi.p $r7, [$r0], #4
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- swi.p $r7, [$r1], #4
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- blt $r0, $r2, copy_loop
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+ swi.p $r7, [$r2], #4
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+ blt $r0, $r1, copy_loop
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/*
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* fix relocations related issues
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*/
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fix_relocations:
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- l.w $r0, _TEXT_BASE /* r0 <- Text base */
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- sub $r9, $r6, $r0 /* r9 <- relocation offset */
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+ l.w $r0, _TEXT_BASE@GOTOFF /* r0 <- Text base */
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+ sub $r9, $r6, $r0 /* r9 <- relocation offset */
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+
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+ la $r7, __rel_dyn_start@GOTOFF
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+ add $r7, $r7, $r9 /* r2 <- rel __got_start in RAM */
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+ la $r8, __rel_dyn_end@GOTOFF
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+ add $r8, $r8, $r9 /* r2 <- rel __got_start in RAM */
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+ li $r3, #0x2a /* R_NDS32_RELATIVE */
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+1:
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+ lmw.bim $r0, [$r7], $r2 /* r0,r1,r2 <- adr,type,addend */
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+ bne $r1, $r3, 2f
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-fix_got:
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-/*
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- * Now we want to update GOT.
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- *
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- * GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
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- * generated by GNU ld. Skip these reserved entries from relocation.
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- */
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- la $r2, __got_start /* r2 <- rel __got_start in FLASH */
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- add $r2, $r2, $r9 /* r2 <- rel __got_start in RAM */
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- la $r3, __got_end /* r3 <- rel __got_end in FLASH */
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- add $r3, $r3, $r9 /* r3 <- rel __got_end in RAM */
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- addi $r2, $r2, #8 /* skipping first two entries */
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-fix_got_loop:
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- lwi $r0, [$r2] /* r0 <- location in FLASH to fix up */
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- add $r0, $r0, $r9 /* r0 <- location fix up to RAM */
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- swi.p $r0, [$r2], #4 /* r0 <- store fix into .got in RAM */
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- blt $r2, $r3, fix_got_loop
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+ add $r0, $r0, $r9
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+ add $r2, $r2, $r9
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+ sw $r2, [$r0]
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+2:
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+ blt $r7, $r8, 1b
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clear_bss:
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- la $r0, __bss_start /* r0 <- rel __bss_start in FLASH */
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+ la $r0, __bss_start@GOTOFF /* r0 <- rel __bss_start in FLASH */
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add $r0, $r0, $r9 /* r0 <- rel __bss_start in FLASH */
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- la $r1, __bss_end /* r1 <- rel __bss_end in RAM */
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+ la $r1, __bss_end@GOTOFF /* r1 <- rel __bss_end in RAM */
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add $r1, $r1, $r9 /* r0 <- rel __bss_end in RAM */
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li $r2, 0x00000000 /* clear */
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@@ -240,7 +264,7 @@ clbss_l:
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* initialization, now running from RAM.
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*/
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call_board_init_r:
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- la $r0, board_init_r
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+ la $r0, board_init_r@GOTOFF
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move $lp, $r0 /* offset of board_init_r() */
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add $lp, $lp, $r9 /* real address of board_init_r() */
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/* setup parameters for board_init_r */
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@@ -275,8 +299,8 @@ cpu_init_crit:
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/* Flush caches and TLB */
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/* Invalidate caches */
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- bal invalidate_icac
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- bal invalidate_dcac
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+ jal invalidate_icac
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+ jal invalidate_dcac
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/* Flush TLB */
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mfsr $p0, $MMU_CFG
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@@ -299,24 +323,6 @@ cpu_init_crit:
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2:
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ret
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-#ifndef CONFIG_SKIP_LOWLEVEL_INIT
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-load_lowlevel_init:
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- la $r6, lowlevel_init
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- la $r7, load_lli + 4
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- sub $p0, $r6, $r7
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- add $p0, $p0, $lp
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-ret
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-#endif
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-
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-#ifndef CONFIG_SKIP_TRUNOFF_WATCHDOG
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-load_turnoff_watchdog:
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- la $r6, turnoff_watchdog
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- la $r7, turnoff_wtdog + 4
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- sub $p0, $r6, $r7
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- add $p0, $p0, $lp
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-ret
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-#endif
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-
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/*
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* Invalidate I$
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*/
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Tom Rini