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thermosphere: start corectx/exception stuff rewrite

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This commit is contained in:
TuxSH 2020-02-20 19:34:33 +00:00
parent d72fc3e8b9
commit ea7d161755
4 changed files with 18 additions and 27 deletions
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5
thermosphere/src/asm_macros.s
View file

@ -16,11 +16,6 @@
#define EXCEP_STACK_FRAME_SIZE 0x140
#define CORECTX_CRASH_STACK_OFFSET 0x000
#define CORECTX_GUEST_FRAME_OFFSET 0x040
#define CORECTX_SCRATCH_OFFSET 0x048
.macro FUNCTION name
.section .text.\name, "ax", %progbits
.global \name

6
thermosphere/src/core_ctx.h
View file

@ -23,11 +23,9 @@ struct ExceptionStackFrame;
typedef struct ALIGN(64) CoreCtx {
// Most likely only just read (assume cache line size of at most 64 bytes):
u8 *crashStack; // @0x00
u64 kernelArgument; // @0x08
uintptr_t kernelEntrypoint; // @0x10
u32 coreId; // @0x18
u8 gicInterfaceMask; // @0x1C. Equal to BIT(coreId) anyway
bool isBootCore; // @0x1D
bool warmboot; // @0x1E
@ -39,14 +37,10 @@ typedef struct ALIGN(64) CoreCtx {
// Most likely written to:
ALIGN(64) struct ExceptionStackFrame *guestFrame; // @0x40
u64 scratch; // @0x48
// Timer stuff
u64 totalTimeInHypervisor; // @0x50. cntvoff_el2 is updated to that value.
u64 emulPtimerCval; // @0x58. When setting cntp_cval_el0 and on interrupt
// Cache stuff
u32 setWayCounter; // @0x7C
} CoreCtx;
/*static_assert(offsetof(CoreCtx, warmboot) == 0x1E, "Wrong definition for CoreCtx");

28
thermosphere/src/exception_vectors.s
View file

@ -78,14 +78,16 @@
.endm
.macro PIVOT_STACK_FOR_CRASH
// Note: x18 assumed uncorrupted
// Note: replace sp_el0 with crashing sp
str x16, [x18, #CORECTX_SCRATCH_OFFSET]
mov x16, sp
msr sp_el0, x16
ldr x16, [x18, #CORECTX_CRASH_STACK_OFFSET]
mov sp, x16
ldr x16, [x18, #CORECTX_SCRATCH_OFFSET]
// Note: replace sp_el1 with crashing sp (for convenience)
// The way we do things means that exception stack ptr won't be reset on double fault
// (sp_el2 is not accessible at el2)
msr spsel, #0
str x0, [sp, #-0x10]
msr spsel, #1
mov x0, sp
msr sp_el1, x0
msr spsel, #0
ldr x0, [sp, #-0x10]
.endm
#define EXCEPTION_TYPE_HOST 0
@ -103,10 +105,10 @@ vector_entry \name
mov x0, sp
.if \type == EXCEPTION_TYPE_GUEST
ldp x18, xzr, [sp, #EXCEP_STACK_FRAME_SIZE]
prfm pldl1keep, [x18]
prfm pstl1keep, [x18, #0x40]
str x0, [x18, #CORECTX_GUEST_FRAME_OFFSET]
ldp x18, x19, [sp, #EXCEP_STACK_FRAME_SIZE]
msr sp_el0, x19
prfm pstl1keep, [x18]
//todo str x0, [x18, #CORECTX_GUEST_FRAME_OFFSET]
mov w1, #1
.else
mov w1, #0
@ -148,7 +150,7 @@ vector_entry _synchSp0
check_vector_size _synchSp0
_unknownException:
pivot_stack_for_crash
PIVOT_STACK_FOR_CRASH
mov x0, x30
adr x1, g_thermosphereVectors + 4
sub x0, x0, x1

6
thermosphere/src/start.s
View file

@ -94,16 +94,16 @@ _postMmuEnableReturnAddr:
bl initSystem
// Save x18, reserve space for exception frame
// TODO: save exception stack too
stp x18, xzr, [sp, #-0x10]!
sub sp, sp, #EXCEP_STACK_FRAME_SIZE
mov x0, sp
mov x1, x20
str x0, [x18, #CORECTX_GUEST_FRAME_OFFSET]
//str x0, [x18, #CORECTX_GUEST_FRAME_OFFSET]
bl thermosphereMain
prfm pldl1keep, [x18]
prfm pstl1keep, [x18, #0x40]
prfm pstl1keep, [x18]
dsb sy
isb