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Hi Guys, I am applying the patch below to add support for interrupt handlers to the MSP430 backend. The patch also adds a couple of MSP430 specific builtin functions intended to be used inside interrupt handlers. In addition the patch adds support for naked functions, critical functions (which disable interrupts whilst they execute) and reentrant functions (which disable interrupts but always reenable them upon exit). Tested with no regressions on an msp430-elf toolchain. Cheers Nick gcc/ChangeLog 2013-09-17 Nick Clifton <nickc@redhat.com> * config/msp430/msp430-protos.h: Add prototypes for new functions. * config/msp430/msp430.c (msp430_preserve_reg_p): Add support for interrupt handlers. (is_attr_func): New function. (msp430_is_interrupt_func): New function. (is_naked_func): New function. (is_reentrant_func): New function. (is_critical_func): New function. (msp430_start_function): Add annotations for function attributes. (msp430_attr): New function. (msp430_attribute_table): New. (msp430_function_section): New function. (TARGET_ASM_FUNCTION_SECTION): Define. (msp430_builtin): New enum. (msp430_init_builtins): New function. (msp430_builtin_devl): New function. (msp430_expand_builtin): New function. (TARGET_INIT_BUILTINS): Define. (TARGET_EXPAND_BUILTINS): Define. (TARGET_BUILTIN_DECL): Define. (msp430_expand_prologue): Add support for naked, interrupt, critical and reentranct functions. (msp430_expand_epilogue): Likewise. (msp430_print_operand): Handle 'O' character. * config/msp430/msp430.h (TARGET_CPU_CPP_BUILTINS): Define NO_TRAMPOLINES. * config/msp430/msp430.md (unspec): Add UNS_DINT, UNS_EINT, UNS_PUSH_INTR, UNS_POP_INTR, UNS_BIC_SR, UNS_BIS_SR. (pushm): Use a 'n' rather than an 'i' contraint. (msp_return): Add generation of the interrupt return instruction. (disable_interrupts): New pattern. (enable_interrupts): New pattern. (push_intr_state): New pattern. (pop_intr_state): New pattern. (bic_SR): New pattern. (bis_SR): New pattern. * doc/extend.texi: Document MSP430 function attributes and builtin functions.
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