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MIPS: fix setup of initial stack frame 

To get correct stack walking and backtrace functionality in gdb,
registers fp and ra should be initialized before calling board_init_f
or board_init_r. Thus allocating stack space and zeroing it as it is
currently done in board.c becomes obsolete.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Daniel Schwierzeck 2014-11-20 23:55:32 +01:00
parent 85bafb6da4
commit 6d08e22aca
2 changed files with 10 additions and 4 deletions
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7
arch/mips/cpu/mips32/start.S
View File

@ -136,10 +136,11 @@ reset:
/* Set up temporary stack */ /* Set up temporary stack */
li sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET li sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
move fp, sp
la t9, board_init_f la t9, board_init_f
jr t9 jr t9
nop move ra, zero
/* /*
* void relocate_code (addr_sp, gd, addr_moni) * void relocate_code (addr_sp, gd, addr_moni)
@ -155,6 +156,7 @@ reset:
.ent relocate_code .ent relocate_code
relocate_code: relocate_code:
move sp, a0 # set new stack pointer move sp, a0 # set new stack pointer
move fp, sp
move s0, a1 # save gd in s0 move s0, a1 # save gd in s0
move s2, a2 # save destination address in s2 move s2, a2 # save destination address in s2
@ -260,8 +262,9 @@ in_ram:
addi t1, 4 addi t1, 4
move a0, s0 # a0 <-- gd move a0, s0 # a0 <-- gd
move a1, s2
la t9, board_init_r la t9, board_init_r
jr t9 jr t9
move a1, s2 move ra, zero
.end relocate_code .end relocate_code

7
arch/mips/cpu/mips64/start.S
View File

@ -130,10 +130,11 @@ reset:
/* Set up temporary stack */ /* Set up temporary stack */
dli sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET dli sp, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
move fp, sp
dla t9, board_init_f dla t9, board_init_f
jr t9 jr t9
nop move ra, zero
/* /*
* void relocate_code (addr_sp, gd, addr_moni) * void relocate_code (addr_sp, gd, addr_moni)
@ -149,6 +150,7 @@ reset:
.ent relocate_code .ent relocate_code
relocate_code: relocate_code:
move sp, a0 # set new stack pointer move sp, a0 # set new stack pointer
move fp, sp
move s0, a1 # save gd in s0 move s0, a1 # save gd in s0
move s2, a2 # save destination address in s2 move s2, a2 # save destination address in s2
@ -254,8 +256,9 @@ in_ram:
daddi t1, 8 daddi t1, 8
move a0, s0 # a0 <-- gd move a0, s0 # a0 <-- gd
move a1, s2
dla t9, board_init_r dla t9, board_init_r
jr t9 jr t9
move a1, s2 move ra, zero
.end relocate_code .end relocate_code