Felipe Neves
29 lines
906 B
ArmAsm
29 lines
906 B
ArmAsm
#include <xtensa/coreasm.h>
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#include <freertos/xtensa_context.h>
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.text
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/**
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* extern void switch_stack_enter(portSTACK_TYPE *stack, portSTACK_TYPE *backup_stack);
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*/
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.globl esp_switch_stack_enter
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.type esp_switch_stack_enter,@function
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.align 4
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esp_switch_stack_enter:
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entry sp, 0x10
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mov a4, a1
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s32i a4, a3, 0 /* on a3 there is a safe place to save the current stack */
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l32i a4, a2, 0 /* obtains the user allocated stack buffer */
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mov a1, a4 /* sp register now contains caller specified stack */
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retw
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/**
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* extern void switch_stack_exit(portSTACK_TYPE *backup_stack);
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*/
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.globl esp_switch_stack_exit
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.type esp_switch_stack_exit,@function
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.align 4
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esp_switch_stack_exit:
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entry sp, 0x10
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l32i a4, a2, 0 /* recover the original task stack */
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mov a1, a4 /* put it on sp register again */
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retw |