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cortex-m-rt: initialize the frame pointer chain. #468

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cortex-m-rt: initialize the frame pointer chain. #468

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5 changes: 5 additions & 0 deletions cortex-m-rt/src/lib.rs
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Expand Up @@ -530,6 +530,11 @@ cfg_global_asm! {
ldr r1, =__vector_table
str r1, [r0]",

// Initialize the frame pointer chain.
// https://github.com/ARM-software/abi-aa/blob/main/aapcs32/aapcs32.rst#6214the-frame-pointer
// > The end of the frame record chain is indicated by the address zero in the address for the previous frame
"mov r7, #0",

// Run user pre-init code which must be executed immediately after startup, before the
// potentially time-consuming memory initialisation takes place.
// Example use cases include disabling default watchdogs or enabling RAM.
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