WIP: Update QEMU to 4.2-rc0

[alistair23]

Signed-off-by: Alistair Francis alistair.francis@wdc.com

[rminnich]

no more patches needed? Wow!

[alistair23]

Don't merge! I'm trying to test. My local setup isn't work for some reason

[alistair23]

I am seeing errors like this on my machine:

rust-lld: error: undefined symbol: __atomic_store_16

so I can't test locally.

[rminnich]

diff --git a/src/soc/sifive/fu540/src/init.S b/src/soc/sifive/fu540/src/init.S
index f3f510c964..fa0c02112f 100644
--- a/src/soc/sifive/fu540/src/init.S
+++ b/src/soc/sifive/fu540/src/init.S
@@ -1,4 +1,9 @@

+.globl __atomic_store_16
+__atomic_store_16:

•   ret
  

+.globl __atomic_load_16
+__atomic_load_16:

•   ret
  

.globl _stack_ptr
.section .rodata
_stack_ptr: .word 0x08010000

fixes it.

can riscv do 16-bit aligned atomic load and store? If not, could that be the issue?

[alistair23]

Can you re-paste the diff as a code segment? I can't understand what you are changing.

It only has atomic load/store word and double, so no 16-bit.

[rminnich]

annoying github.

`+.globl __atomic_store_16
+__atomic_store_16:

•   ret
  

+.globl __atomic_load_16
+__atomic_load_16:

•   ret
  

.globl _stack_ptr
.section .rodata
_stack_ptr: .word 0x08010000`

[rminnich]

alistair, does this work for you too?

[alistair23]

Yep, that fix works for me. I'm going to close this PR and open a correct one.