50 lines
973 B
ArmAsm
50 lines
973 B
ArmAsm
/* opencoreC - Timer Preemptive Interrupt Trampoline (Vector 32 / 0x20) */
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.global timer_isr_entry
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.extern timer_interrupt_handler
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.section .text
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timer_isr_entry:
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/* 1. Save all general-purpose registers to form a complete interrupt context frame */
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push rax
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push rbx
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push rcx
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push rdx
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push rsi
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push rdi
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push rbp
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push r8
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push r9
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push r10
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push r11
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push r12
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push r13
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push r14
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push r15
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/* 2. Pass current saved stack pointer in RDI */
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mov rdi, rsp
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call timer_interrupt_handler
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/* 3. Switch stack pointer to returned value (RAX contains next thread's RSP) */
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mov rsp, rax
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/* 4. Restore all general-purpose registers */
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pop r15
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pop r14
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pop r13
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pop r12
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pop r11
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pop r10
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pop r9
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pop r8
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pop rbp
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pop rdi
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pop rsi
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pop rdx
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pop rcx
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pop rbx
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pop rax
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/* 5. Return from interrupt (IRETQ restores RIP, CS, RFLAGS, RSP, SS) */
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iretq
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