From 12e2e0e60933f0d4042087f13758ac5c1ae8d226 Mon Sep 17 00:00:00 2001 From: Angel Pons Date: Fri, 19 Feb 2021 11:35:07 +0100 Subject: arch/arm/armv7/thread.c: Remove stale file This file is never built. Plus, `CONFIG_STACK_BOTTOM` does not exist. Change-Id: I111b20e3443dca701ee8666d44261a00a161d83f Signed-off-by: Angel Pons Reviewed-on: https://review.coreboot.org/c/coreboot/+/50909 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner --- src/arch/arm/armv7/thread.c | 110 -------------------------------------------- 1 file changed, 110 deletions(-) delete mode 100644 src/arch/arm/armv7/thread.c diff --git a/src/arch/arm/armv7/thread.c b/src/arch/arm/armv7/thread.c deleted file mode 100644 index 63ef7a83b8..0000000000 --- a/src/arch/arm/armv7/thread.c +++ /dev/null @@ -1,110 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-only */ - -#include - -/* The stack frame looks like the following. */ -struct pushed_regs { - u32 r4; - u32 r5; - u32 r6; - u32 r7; - u32 r8; - u32 r9; - u32 r10; - u32 r11; - u32 lr; -}; - -static inline uintptr_t push_stack(uintptr_t cur_stack, uintptr_t value) -{ - uintptr_t *addr; - - cur_stack -= sizeof(value); - addr = (uintptr_t *)cur_stack; - *addr = value; - return cur_stack; -} - -void arch_prepare_thread(struct thread *t, - void asmlinkage(*thread_entry)(void *), void *arg) -{ - uintptr_t stack = t->stack_current; - int i; - uintptr_t poison = 0xdeadbeef; - - /* Push the LR. thread_entry() - * is assumed to never return. - */ - stack = push_stack(stack, (uintptr_t)thread_entry); - /* Make room for the registers. - * Poison the initial stack. This is good hygiene and finds bugs. - * Poisoning the stack with different values helps when you're - * hunting for (e.g.) misaligned stacks or other such - * weirdness. The -1 is because we already pushed lr. - */ - for (i = 0; i < sizeof(struct pushed_regs) / sizeof(u32) - 1; i++) - stack = push_stack(stack, poison++); - - t->stack_current = stack; -} - -/* We could write this as a .S and the first time around that's how we - * did it. But there's always the question of matching our ARM - * directives in the .S with how gcc is doing things. It seems best - * to follow the pattern of the rest of the ARM port and just use - * inline assembly and let gcc get all the ELF magic right. - */ -void __attribute__((naked)) -switch_to_thread(uintptr_t new_stack, uintptr_t *saved_stack) -{ - /* Definitions for those of us not totally familiar with ARM: - * R15 -- PC, R14 -- LR, R13 -- SP - * R0-R3 need not be saved, nor R12. - * on entry, the only saved state is in LR -- the old PC. - * The args are in R0,R1. - * R0 is the new stack - * R1 is a pointer to the old stack save location - * Push R4-R11 and LR - * then switch stacks - * then pop R0-R12 and LR - * then mov PC,LR - * - * stack layout - * +------------+ - * | LR | <-- sp + 0x20 - * +------------+ - * | R11 | <-- sp + 0x1c - * +------------+ - * | R10 | <-- sp + 0x18 - * +------------+ - * | R9 | <-- sp + 0x14 - * +------------+ - * | R8 | <-- sp + 0x10 - * +------------+ - * | R7 | <-- sp + 0x0c - * +------------+ - * | R6 | <-- sp + 0x08 - * +------------+ - * | R5 | <-- sp + 0x04 - * +------------+ - * | R4 | <-- sp + 0x00 - * +------------+ - */ - asm volatile ( - /* save context. */ - "push {r4-r11,lr}\n\t" - /* Save the current stack */ - "str sp,[r1]\n\t" - /* switch to the new stack */ - "mov sp,r0\n\t" - /* restore the registers */ - "pop {r4-r11,lr}\n\t" - /* resume other thread. */ - "mov pc,lr\n\t" - ); -} - -void *arch_get_thread_stackbase(void) -{ - return (void *)CONFIG_STACK_BOTTOM; -} -- cgit v1.2.3