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Better exception/interrupt handle

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This commit is contained in:
Valentin Haudiquet
2023-11-03 11:25:58 +01:00
parent 0983be511c
commit 923e9d39a0
3 changed files with 43 additions and 24 deletions
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8
src/cpu/exception.c
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@@ -15,6 +15,8 @@ __attribute__((noreturn)) void exception_trigger(rv32_cpu_t* cpu, uint32_t scaus
// Exceptions cannot be disabled
// TODO : Check medeleg to see if we should handle exception in S mode or M mode
// Unset SIE (interrupt enable) bit
csr_write(cpu, CSR_SSTATUS, csr_read(cpu, CSR_SSTATUS) & (~STATUS_SIE));
@@ -37,8 +39,10 @@ __attribute__((noreturn)) void exception_trigger(rv32_cpu_t* cpu, uint32_t scaus
csr_write(cpu, CSR_SSTATUS, csr_read(cpu, CSR_SSTATUS) & (~STATUS_SPIE));
// Set previous privilege mode in xSTATUS.xPP
// TODO : Allow user mode exceptions (by not setting this)
csr_write(cpu, CSR_SSTATUS, csr_read(cpu, CSR_SSTATUS) | STATUS_SPP);
if(cpu->privilege_mode == SUPERVISOR)
csr_write(cpu, CSR_SSTATUS, csr_read(cpu, CSR_SSTATUS) | STATUS_SPP);
else if(cpu->privilege_mode == USER)
csr_write(cpu, CSR_SSTATUS, csr_read(cpu, CSR_SSTATUS) & (~STATUS_SPP));
// Set privilege mode for exception handling, checking for delegation
// TODO