*
* Copyright (c) 2003 Wolfgang Denk <wd@denx.de>
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any dlater version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICUdlaR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Pdlace, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <asm-offsets.h>
#define CONFIG_SYS_MIPS_CACHE_MODE CONF_CM_CACHABLE_NONCOHERENT
#endif
+#ifndef CONFIG_SYS_INIT_SP_ADDR
+#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
+ CONFIG_SYS_INIT_SP_OFFSET)
+#endif
+
+#ifdef CONFIG_SYS_LITTLE_ENDIAN
+#define MIPS64_R_INFO(ssym, r_type3, r_type2, r_type) \
+ (((r_type) << 24) | ((r_type2) << 16) | ((r_type3) << 8) | (ssym))
+#else
+#define MIPS64_R_INFO(ssym, r_type3, r_type2, r_type) \
+ ((r_type) | ((r_type2) << 8) | ((r_type3) << 16) | (ssym) << 24)
+#endif
+
/*
* For the moment disable interrupts, mark the kernel mode and
* set ST0_KX so that the CPU does not spit fire when using
.globl _start
.text
_start:
- .org 0x000
+ /* U-boot entry point */
b reset
nop
- .org 0x080
- b romReserved
- nop
- .org 0x100
- b romReserved
- nop
- .org 0x180
- b romReserved
- nop
+
.org 0x200
- b romReserved
+ /* TLB refill, 32 bit task */
+1: b 1b
nop
+
.org 0x280
- b romReserved
+ /* XTLB refill, 64 bit task */
+1: b 1b
nop
+
.org 0x300
- b romReserved
+ /* Cache error exception */
+1: b 1b
nop
+
.org 0x380
- b romReserved
+ /* General exception */
+1: b 1b
nop
+
+ .org 0x400
+ /* Catch interrupt exceptions */
+1: b 1b
+ nop
+
.org 0x480
- b romReserved
+ /* EJTAG debug exception */
+1: b 1b
nop
- /*
- * We hope there are no more reserved vectors!
- * 128 * 8 == 1024 == 0x400
- * so this is address R_VEC+0x400 == 0xbfc00400
- */
- .org 0x500
.align 4
reset:
#endif
/* Set up temporary stack */
- dli t0, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
- dla sp, 0(t0)
+ dli t0, -16
+ dli t1, CONFIG_SYS_INIT_SP_ADDR
+ and sp, t1, t0 # force 16 byte alignment
+ dsub sp, sp, GD_SIZE # reserve space for gd
+ and sp, sp, t0 # force 16 byte alignment
+ move k0, sp # save gd pointer
+#ifdef CONFIG_SYS_MALLOC_F_LEN
+ dli t2, CONFIG_SYS_MALLOC_F_LEN
+ dsub sp, sp, t2 # reserve space for early malloc
+ and sp, sp, t0 # force 16 byte alignment
+#endif
+ move fp, sp
+
+ /* Clear gd */
+ move t0, k0
+1:
+ sw zero, 0(t0)
+ blt t0, t1, 1b
+ daddi t0, 4
+
+#ifdef CONFIG_SYS_MALLOC_F_LEN
+ daddu t0, k0, GD_MALLOC_BASE # gd->malloc_base offset
+ sw sp, 0(t0)
+#endif
dla t9, board_init_f
jr t9
- nop
+ move ra, zero
/*
* void relocate_code (addr_sp, gd, addr_moni)
.ent relocate_code
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
dli t0, CONFIG_SYS_MONITOR_BASE
+ dsub s1, s2, t0 # s1 <-- relocation offset
+
dla t3, in_ram
- ld t2, -24(t3) # t2 <-- uboot_end_data
+ ld t2, -24(t3) # t2 <-- __image_copy_end
move t1, a2
- move s2, a2 # s2 <-- destination address
- /*
- * Fix $gp:
- *
- * New $gp = (Old $gp - CONFIG_SYS_MONITOR_BASE) + Destination Address
- */
- move t8, gp
- dsub gp, CONFIG_SYS_MONITOR_BASE
- dadd gp, a2 # gp now adjusted
- dsub s1, gp, t8 # s1 <-- relocation offset
+ dadd gp, s1 # adjust gp
/*
* t0 = source address
* t1 = target address
* t2 = source end address
*/
-
- /*
- * Save destination address and size for dlater usage in flush_cache()
- */
- move s0, a1 # save gd in s0
- move a0, t1 # a0 <-- destination addr
- dsub a1, t2, t0 # a1 <-- size
-
1:
lw t3, 0(t0)
sw t3, 0(t1)
daddu t0, 4
- ble t0, t2, 1b
+ blt t0, t2, 1b
daddu t1, 4
/* If caches were enabled, we would have to flush them here. */
-
- /* a0 & a1 are already set up for flush_cache(start, size) */
+ dsub a1, t1, s2 # a1 <-- size
dla t9, flush_cache
jalr t9
- nop
+ move a0, s2 # a0 <-- destination address
/* Jump to where we've relocated ourselves */
daddi t0, s2, in_ram - _start
jr t0
nop
- .dword _gp
+ .dword __rel_dyn_end
+ .dword __rel_dyn_start
+ .dword __image_copy_end
.dword _GLOBAL_OFFSET_TABLE_
- .dword uboot_end_data
- .dword uboot_end
.dword num_got_entries
in_ram:
* generated by GNU ld. Skip these reserved entries from relocation.
*/
ld t3, -8(t0) # t3 <-- num_got_entries
- ld t8, -32(t0) # t8 <-- _GLOBAL_OFFSET_TABLE_
- ld t9, -40(t0) # t9 <-- _gp
- dsub t8, t9 # compute offset
- dadd t8, t8, gp # t8 now holds relocated _G_O_T_
+ ld t8, -16(t0) # t8 <-- _GLOBAL_OFFSET_TABLE_
+ dadd t8, s1 # t8 now holds relocated _G_O_T_
daddi t8, t8, 16 # skipping first two entries
dli t2, 2
1:
blt t2, t3, 1b
daddi t8, 8
- /* Clear BSS */
- ld t1, -24(t0) # t1 <-- uboot_end_data
- ld t2, -16(t0) # t2 <-- uboot_end
- dadd t1, s1 # adjust pointers
- dadd t2, s1
+ /* Update dynamic relocations */
+ ld t1, -32(t0) # t1 <-- __rel_dyn_start
+ ld t2, -40(t0) # t2 <-- __rel_dyn_end
+
+ b 2f # skip first reserved entry
+ daddi t1, 16
- dsub t1, 8
1:
- daddi t1, 8
- bltl t1, t2, 1b
- sd zero, 0(t1)
+ lw t8, -4(t1) # t8 <-- relocation info
+
+ dli t3, MIPS64_R_INFO(0x00, 0x00, 0x12, 0x03)
+ bne t8, t3, 2f # skip non R_MIPS_REL32 entries
+ nop
+
+ ld t3, -16(t1) # t3 <-- location to fix up in FLASH
+
+ ld t8, 0(t3) # t8 <-- original pointer
+ dadd t8, s1 # t8 <-- adjusted pointer
+
+ dadd t3, s1 # t3 <-- location to fix up in RAM
+ sd t8, 0(t3)
+
+2:
+ blt t1, t2, 1b
+ daddi t1, 16 # each rel.dyn entry is 16 bytes
+
+ /*
+ * Clear BSS
+ *
+ * GOT is now relocated. Thus __bss_start and __bss_end can be
+ * accessed directly via $gp.
+ */
+ dla t1, __bss_start # t1 <-- __bss_start
+ dla t2, __bss_end # t2 <-- __bss_end
+
+1:
+ sd zero, 0(t1)
+ blt t1, t2, 1b
+ daddi t1, 8
move a0, s0 # a0 <-- gd
+ move a1, s2
dla t9, board_init_r
jr t9
- move a1, s2
+ move ra, zero
.end relocate_code
-
- /* Exception handlers */
-romReserved:
- b romReserved
projects / karo-tx-uboot.git / blobdiff