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SPARC: reduce z_thread_entry_wrapper

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Transfer the entry point and initial parameters in the callee_saved
struct rather than on the stack. This saves 48 byte stack per thread
and simplifies the logic.

Signed-off-by: Julius Barendt <julius.barendt@gaisler.com>
This commit is contained in:
Julius Barendt 2022-07-21 12:35:40 +02:00 committed by Carles Cufí
parent 6a41330650
commit 42da90f6bf
2 changed files with 8 additions and 15 deletions
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8
arch/sparc/core/switch.S
View file

@ -150,9 +150,9 @@ SECTION_FUNC(TEXT, z_sparc_context_switch)
SECTION_FUNC(TEXT, z_thread_entry_wrapper)
mov %g0, %o7
ld [%sp + 0x40], %o0
ld [%sp + 0x44], %o1
ld [%sp + 0x48], %o2
ld [%sp + 0x4C], %o3
mov %i0, %o0
mov %i1, %o1
mov %i2, %o2
mov %i3, %o3
call z_thread_entry
nop

15
arch/sparc/core/thread.c
View file

@ -20,11 +20,6 @@ void z_thread_entry_wrapper(k_thread_entry_t thread,
*/
struct init_stack_frame {
uint32_t window_save_area[16];
k_thread_entry_t entry_point;
void *arg1;
void *arg2;
void *arg3;
uint32_t pad[8];
};
#if defined(CONFIG_FPU_SHARING)
@ -42,12 +37,10 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
/* Initial stack frame data, stored at base of the stack */
iframe = Z_STACK_PTR_TO_FRAME(struct init_stack_frame, stack_ptr);
iframe->entry_point = entry;
iframe->arg1 = p1;
iframe->arg2 = p2;
iframe->arg3 = p3;
/* Put values for debugging purposes */
thread->callee_saved.i0 = (uint32_t) entry;
thread->callee_saved.i1 = (uint32_t) p1;
thread->callee_saved.i2 = (uint32_t) p2;
thread->callee_saved.i3 = (uint32_t) p3;
thread->callee_saved.i6 = 0; /* frame pointer */
thread->callee_saved.o6 = (uint32_t) iframe; /* stack pointer */
thread->callee_saved.o7 = (uint32_t) z_thread_entry_wrapper - 8;