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-rw-r--r--board/dbau1x00/u-boot.lds14
-rw-r--r--board/gth2/u-boot.lds14
-rw-r--r--board/incaip/u-boot.lds14
-rw-r--r--board/pb1x00/u-boot.lds14
-rw-r--r--board/purple/u-boot.lds14
-rw-r--r--board/tb0229/u-boot.lds14
-rw-r--r--cpu/mips/config.mk2
-rw-r--r--cpu/mips/start.S19
-rw-r--r--examples/mips.lds14
-rw-r--r--include/asm-mips/addrspace.h2
-rw-r--r--mips_config.mk25
11 files changed, 89 insertions, 57 deletions
diff --git a/board/dbau1x00/u-boot.lds b/board/dbau1x00/u-boot.lds
index 10c9917..9639b81 100644
--- a/board/dbau1x00/u-boot.lds
+++ b/board/dbau1x00/u-boot.lds
@@ -43,14 +43,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
-
- _gp = ALIGN(16);
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/board/gth2/u-boot.lds b/board/gth2/u-boot.lds
index 8ba0b6d..90432cb 100644
--- a/board/gth2/u-boot.lds
+++ b/board/gth2/u-boot.lds
@@ -43,14 +43,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- _gp = ALIGN(16);
-
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/board/incaip/u-boot.lds b/board/incaip/u-boot.lds
index 10c9917..9639b81 100644
--- a/board/incaip/u-boot.lds
+++ b/board/incaip/u-boot.lds
@@ -43,14 +43,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
-
- _gp = ALIGN(16);
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/board/pb1x00/u-boot.lds b/board/pb1x00/u-boot.lds
index a2d19a8..363d974 100644
--- a/board/pb1x00/u-boot.lds
+++ b/board/pb1x00/u-boot.lds
@@ -43,14 +43,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- _gp = ALIGN(16);
-
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/board/purple/u-boot.lds b/board/purple/u-boot.lds
index 1bdac1f..e7ec012 100644
--- a/board/purple/u-boot.lds
+++ b/board/purple/u-boot.lds
@@ -53,14 +53,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
-
- _gp = ALIGN(16);
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/board/tb0229/u-boot.lds b/board/tb0229/u-boot.lds
index 30a2bc5..b2fa9f2 100644
--- a/board/tb0229/u-boot.lds
+++ b/board/tb0229/u-boot.lds
@@ -43,14 +43,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
-
- _gp = ALIGN(16);
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/cpu/mips/config.mk b/cpu/mips/config.mk
index b29986e..487c4eb 100644
--- a/cpu/mips/config.mk
+++ b/cpu/mips/config.mk
@@ -35,6 +35,6 @@ else
ENDIANNESS = -EB
endif
-MIPSFLAGS += $(ENDIANNESS) -mabicalls
+MIPSFLAGS += $(ENDIANNESS)
PLATFORM_CPPFLAGS += $(MIPSFLAGS)
diff --git a/cpu/mips/start.S b/cpu/mips/start.S
index e91e213..074d01d 100644
--- a/cpu/mips/start.S
+++ b/cpu/mips/start.S
@@ -234,11 +234,11 @@ reset:
li t0, CONF_CM_UNCACHED
mtc0 t0, CP0_CONFIG
- /* Initialize GOT pointer.
+ /* Initialize $gp.
*/
bal 1f
nop
- .word _GLOBAL_OFFSET_TABLE_
+ .word _gp
1:
move gp, ra
lw t1, 0(ra)
@@ -306,9 +306,9 @@ relocate_code:
move t1, a2
/*
- * Fix GOT pointer:
+ * Fix $gp:
*
- * New GOT-PTR = (old GOT-PTR - CFG_MONITOR_BASE) + Destination Address
+ * New $gp = (Old $gp - CFG_MONITOR_BASE) + Destination Address
*/
move t6, gp
sub gp, CFG_MONITOR_BASE
@@ -341,15 +341,22 @@ relocate_code:
j t0
nop
+ .gpword _GLOBAL_OFFSET_TABLE_ /* _GLOBAL_OFFSET_TABLE_ - _gp */
.word uboot_end_data
.word uboot_end
.word num_got_entries
in_ram:
- /* Now we want to update GOT.
+ /*
+ * 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.
*/
lw t3, -4(t0) /* t3 <-- num_got_entries */
- addi t4, gp, 8 /* Skipping first two entries. */
+ lw t4, -16(t0) /* t4 <-- (_GLOBAL_OFFSET_TABLE_ - _gp) */
+ add t4, t4, gp /* t4 now holds _GLOBAL_OFFSET_TABLE_ */
+ addi t4, t4, 8 /* Skipping first two entries. */
li t2, 2
1:
lw t1, 0(t4)
diff --git a/examples/mips.lds b/examples/mips.lds
index 9d9849b..a770728 100644
--- a/examples/mips.lds
+++ b/examples/mips.lds
@@ -39,14 +39,14 @@ SECTIONS
. = ALIGN(4);
.data : { *(.data) }
- . = ALIGN(4);
- .sdata : { *(.sdata) }
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
- _gp = ALIGN(16);
-
- __got_start = .;
- .got : { *(.got) }
- __got_end = .;
+ .got : {
+ __got_start = .;
+ *(.got)
+ __got_end = .;
+ }
.sdata : { *(.sdata) }
diff --git a/include/asm-mips/addrspace.h b/include/asm-mips/addrspace.h
index b8214b1..0e6abd7 100644
--- a/include/asm-mips/addrspace.h
+++ b/include/asm-mips/addrspace.h
@@ -49,7 +49,7 @@
cannot access physical memory directly from core */
#define UNCACHED_SDRAM(a) (((unsigned long)(a)) | 0x20000000)
#else /* !CONFIG_AU1X00 */
-#define UNCACHED_SDRAM(a) PHYSADDR(a)
+#define UNCACHED_SDRAM(a) KSEG1ADDR(a)
#endif /* CONFIG_AU1X00 */
#endif /* __ASSEMBLY__ */
/*
diff --git a/mips_config.mk b/mips_config.mk
index d8aa5fa..67fb67d 100644
--- a/mips_config.mk
+++ b/mips_config.mk
@@ -22,3 +22,28 @@
#
PLATFORM_CPPFLAGS += -DCONFIG_MIPS -D__MIPS__
+
+#
+# From Linux arch/mips/Makefile
+#
+# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
+# code since it only slows down the whole thing. At some point we might make
+# use of global pointer optimizations but their use of $28 conflicts with
+# the current pointer optimization.
+#
+# The DECStation requires an ECOFF kernel for remote booting, other MIPS
+# machines may also. Since BFD is incredibly buggy with respect to
+# crossformat linking we rely on the elf2ecoff tool for format conversion.
+#
+# cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
+# cflags-y += -msoft-float
+# LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
+# MODFLAGS += -mlong-calls
+#
+
+#
+# Meanwhile, U-Boot rely on PIC. We add proper switches explicitly.
+#
+PLATFORM_CPPFLAGS += -G 0 -mabicalls -fpic -pipe
+PLATFORM_CPPFLAGS += -msoft-float
+PLATFORM_LDFLAGS += -G 0 -static -n -nostdlib
generated by cgit v1.1 at 2024-11-23 04:00:51 +0000