From 025f2b338072781cd747bf7365cf43fcf9f40f1a Mon Sep 17 00:00:00 2001 From: Gabor Juhos <juhosg@openwrt.org> Date: Wed, 30 Jan 2013 04:56:37 +0000 Subject: [PATCH] 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> --- arch/mips/cpu/mips32/start.S | 5 +---- arch/mips/cpu/mips64/start.S | 5 +---- arch/mips/cpu/xburst/start.S | 5 +---- 3 files changed, 3 insertions(+), 12 deletions(-) diff --git a/arch/mips/cpu/mips32/start.S b/arch/mips/cpu/mips32/start.S index 77f1103216..51ce914fad 100644 --- a/arch/mips/cpu/mips32/start.S +++ b/arch/mips/cpu/mips32/start.S @@ -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: diff --git a/arch/mips/cpu/mips64/start.S b/arch/mips/cpu/mips64/start.S index 80e6bb1398..15225945e9 100644 --- a/arch/mips/cpu/mips64/start.S +++ b/arch/mips/cpu/mips64/start.S @@ -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: diff --git a/arch/mips/cpu/xburst/start.S b/arch/mips/cpu/xburst/start.S index 194d7452e1..9e637dfe99 100644 --- a/arch/mips/cpu/xburst/start.S +++ b/arch/mips/cpu/xburst/start.S @@ -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: -- 2.39.5