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arm64: Stop trashing x28 in savectx

Browse source 
While here make it return void, we don't set any useful return value
and nothing checks for it.

Sponsored by:	Arm Ltd

(cherry picked from commit a7c5c88cb29ff512467a6599f1b4d8e2b8817480)
This commit is contained in:
Andrew Turner 2024-10-15 09:30:17 +01:00
parent 78b308e5a4
commit ce5a07a9d2
2 changed files with 5 additions and 7 deletions
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10
sys/arm64/arm64/swtch.S
View file

@ -265,13 +265,11 @@ ENTRY(savectx)
mrs x6, tpidr_el0
stp x5, x6, [x0, #PCB_SP]
/* Store the VFP registers */
#ifdef VFP
mov x28, lr
bl vfp_save_state_savectx
mov lr, x28
#endif
/* Store the VFP registers */
b vfp_save_state_savectx
#else
ret
#endif
END(savectx)

2
sys/arm64/include/pcb.h
View file

@ -85,7 +85,7 @@ struct pcb {
#ifdef _KERNEL
void makectx(struct trapframe *tf, struct pcb *pcb);
int savectx(struct pcb *pcb) __returns_twice;
void savectx(struct pcb *pcb) __returns_twice;
#endif
#endif /* !LOCORE */