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https://github.com/zephyrproject-rtos/zephyr
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2d6194170b
The current implementation to preserve r0 and r3 registers around the call to `read_timer_end_of_isr` function has the following problems: 1. STM and LDM mnemonics are used without proper suffixes, in attempt to implement PUSH and POP (i.e. STMFD and LDMFD). The suffix-less STM mnemonic is equivalent to STMEA (increment after), which clearly is not a PUSH operation, and this corrupts the interrupt stack, leading to crashes on the Cortex-R. 2. The current implementation unnecessarily preserves additional r1, r2 and lr registers. There is no need to preserve r1 and r2 because the values contained in these registers are not used after the function call; as for the lr register, it is already pushed to the stack when the interrupt service routine enters. This commit removes all the unnecessary register preservations and fixes the incorrect STM and LDM usages. Note that the PUSH and POP aliases are used in place of the STMFD and LDMFD mnemonics because they are used throughout the rest of the code. Signed-off-by: Stephanos Ioannidis <root@stephanos.io> |
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| arc | ||
| arm | ||
| common | ||
| nios2 | ||
| posix | ||
| riscv | ||
| x86 | ||
| xtensa | ||
| CMakeLists.txt | ||
| Kconfig | ||