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authorMax Filippov <jcmvbkbc@gmail.com>2021-05-02 01:32:58 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2021-10-19 08:19:35 +0300
commit0b5372570b1f3fcb35255d28e707846e613c27f2 (patch)
tree7f38b947b50ad051903ec2d251fb51f3c62bc706 /arch/xtensa/boot
parent5cce39b6aaa02da77e071b2b0880bedfb903330f (diff)
downloadlinux-0b5372570b1f3fcb35255d28e707846e613c27f2.tar.xz
xtensa: implement call0 ABI support in assembly
Replace hardcoded register and opcode names with ABI-agnostic macros. Add register save/restore code where necessary. Conditionalize windowed only or call0 only code. Add stack initialization matching _switch_to epilogue to copy_thread. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/boot')
-rw-r--r--arch/xtensa/boot/boot-redboot/bootstrap.S68
1 files changed, 36 insertions, 32 deletions
diff --git a/arch/xtensa/boot/boot-redboot/bootstrap.S b/arch/xtensa/boot/boot-redboot/bootstrap.S
index 48ba5a232d94..51e8f3b88e82 100644
--- a/arch/xtensa/boot/boot-redboot/bootstrap.S
+++ b/arch/xtensa/boot/boot-redboot/bootstrap.S
@@ -3,6 +3,7 @@
#include <asm/regs.h>
#include <asm/asmmacro.h>
#include <asm/cacheasm.h>
+#include <asm/processor.h>
/*
* RB-Data: RedBoot data/bss
* P: Boot-Parameters
@@ -36,7 +37,7 @@
.globl __start
/* this must be the first byte of the loader! */
__start:
- entry sp, 32 # we do not intend to return
+ abi_entry(32) # we do not intend to return
_call0 _start
__start_a0:
.align 4
@@ -62,10 +63,12 @@ _start:
wsr a4, windowstart
rsync
- movi a4, 0x00040000
+ movi a4, KERNEL_PS_WOE_MASK
wsr a4, ps
rsync
+KABI_C0 mov abi_saved0, abi_arg0
+
/* copy the loader to its address
* Note: The loader itself is a very small piece, so we assume we
* don't partially overlap. We also assume (even more important)
@@ -168,52 +171,52 @@ _reloc:
movi a3, __image_load
sub a4, a3, a4
- add a8, a0, a4
+ add abi_arg2, a0, a4
# a1 Stack
# a8(a4) Load address of the image
- movi a6, _image_start
- movi a10, _image_end
- movi a7, 0x1000000
- sub a11, a10, a6
- movi a9, complen
- s32i a11, a9, 0
+ movi abi_arg0, _image_start
+ movi abi_arg4, _image_end
+ movi abi_arg1, 0x1000000
+ sub abi_tmp0, abi_arg4, abi_arg0
+ movi abi_arg3, complen
+ s32i abi_tmp0, abi_arg3, 0
movi a0, 0
- # a6 destination
- # a7 maximum size of destination
- # a8 source
- # a9 ptr to length
+ # abi_arg0 destination
+ # abi_arg1 maximum size of destination
+ # abi_arg2 source
+ # abi_arg3 ptr to length
.extern gunzip
- movi a4, gunzip
- beqz a4, 1f
+ movi abi_tmp0, gunzip
+ beqz abi_tmp0, 1f
- callx4 a4
+ abi_callx abi_tmp0
j 2f
- # a6 destination start
- # a7 maximum size of destination
- # a8 source start
- # a9 ptr to length
- # a10 destination end
+ # abi_arg0 destination start
+ # abi_arg1 maximum size of destination
+ # abi_arg2 source start
+ # abi_arg3 ptr to length
+ # abi_arg4 destination end
1:
- l32i a9, a8, 0
- l32i a11, a8, 4
- s32i a9, a6, 0
- s32i a11, a6, 4
- l32i a9, a8, 8
- l32i a11, a8, 12
- s32i a9, a6, 8
- s32i a11, a6, 12
- addi a6, a6, 16
- addi a8, a8, 16
- blt a6, a10, 1b
+ l32i abi_tmp0, abi_arg2, 0
+ l32i abi_tmp1, abi_arg2, 4
+ s32i abi_tmp0, abi_arg0, 0
+ s32i abi_tmp1, abi_arg0, 4
+ l32i abi_tmp0, abi_arg2, 8
+ l32i abi_tmp1, abi_arg2, 12
+ s32i abi_tmp0, abi_arg0, 8
+ s32i abi_tmp1, abi_arg0, 12
+ addi abi_arg0, abi_arg0, 16
+ addi abi_arg2, abi_arg2, 16
+ blt abi_arg0, abi_arg4, 1b
/* jump to the kernel */
@@ -230,6 +233,7 @@ _reloc:
# a2 Boot parameter list
+KABI_C0 mov abi_arg0, abi_saved0
movi a0, _image_start
jx a0