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microblaze: start.S: use stack space as scratch memory for endian offset

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To simpify the code, use stack space as scratch memory for endian offset
calculation, rather than saving/restoring the first unused MB vector.

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Link: https://lore.kernel.org/r/20211130163358.2531677-5-ovidiu.panait@windriver.com
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Ovidiu Panait 2021-11-30 18:33:52 +02:00 committed by Michal Simek
parent 7a971dfbeb
commit 48039c333f
1 changed files with 2 additions and 4 deletions
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6
arch/microblaze/cpu/start.S
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@ -125,10 +125,8 @@ __setup_exceptions:
* 4b) BIG endian - r10 contains 0x0 because 0x2 offset is on addr 0x3
*/
addik r6, r0, 0x2 /* BIG/LITTLE endian offset */
lwi r7, r0, 0x28
swi r6, r0, 0x28 /* used first unused MB vector */
lbui r10, r0, 0x28 /* used first unused MB vector */
swi r7, r0, 0x28
sw r6, r1, r0
lbu r10, r1, r0
/* add opcode instruction for 32bit jump - 2 instruction imm & brai */
addi r2, r0, 0xb0000000 /* hex b000 opcode imm */