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MIPS: simplify relocated _G_O_T_ address calculation 

The difference between the address of the original
and the relocated _GLOBAL_OFFSET_TABLE_ is always
the same as the relocation offset.

The relocation offset is already computed and it is
available in the 's1/t6' register. Use that to adjust
the relocated _G_O_T_ address, instead of calculating
the offset again from the _gp value.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
Cc: Xiangfu Liu <xiangfu@openmobilefree.net>
This commit is contained in:
Gabor Juhos 2013-01-30 04:56:37 +00:00 committed by Daniel Schwierzeck
parent 67d80c9f97
commit 025f2b3380
3 changed files with 3 additions and 12 deletions
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5
arch/mips/cpu/mips32/start.S
View File

@ -314,7 +314,6 @@ relocate_code:
jr t0
nop
.word _gp
.word _GLOBAL_OFFSET_TABLE_
.word uboot_end_data
.word uboot_end
@ -329,9 +328,7 @@ in_ram:
*/
lw t3, -4(t0) # t3 <-- num_got_entries
lw t4, -16(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
lw t5, -20(t0) # t5 <-- _gp
sub t4, t5 # compute offset
add t4, t4, gp # t4 now holds relocated _G_O_T_
add t4, s1 # t4 now holds relocated _G_O_T_
addi t4, t4, 8 # skipping first two entries
li t2, 2
1:

5
arch/mips/cpu/mips64/start.S
View File

@ -193,7 +193,6 @@ relocate_code:
jr t0
nop
.dword _gp
.dword _GLOBAL_OFFSET_TABLE_
.dword uboot_end_data
.dword uboot_end
@ -208,9 +207,7 @@ in_ram:
*/
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_
dadd t8, s1 # t8 now holds relocated _G_O_T_
daddi t8, t8, 16 # skipping first two entries
dli t2, 2
1:

5
arch/mips/cpu/xburst/start.S
View File

@ -122,7 +122,6 @@ relocate_code:
jr t0
nop
.word _gp
.word _GLOBAL_OFFSET_TABLE_
.word uboot_end_data
.word uboot_end
@ -137,9 +136,7 @@ in_ram:
*/
lw t3, -4(t0) # t3 <-- num_got_entries
lw t4, -16(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
lw t5, -20(t0) # t5 <-- _gp
sub t4, t5 # compute offset
add t4, t4, gp # t4 now holds relocated _G_O_T_
add t4, t6 # t4 now holds relocated _G_O_T_
addi t4, t4, 8 # skipping first two entries
li t2, 2
1: