SceExcpmgr: Difference between revisions

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(Change information about Thumb support for exception handlers)
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// Exception handlers' prototype
// Exception handlers' prototype
typedef void(SceExcpmgrExceptionHandler)(SceExcpmgrExceptionContext* context, SceExcpmgrExceptionHandlingCode code);
typedef void(SceExcpmgrExceptionHandler)(SceExcpmgrExceptionContext* context, SceExcpmgrExceptionHandlingCode code); //Prototype for non-zero priority handlers
typedef void(SceExcpmgrPriority0ExceptionHandler)(void); //Prototype for priority 0 handlers


// Parameter for the RegisterHandler/ReleaseHandler functions
// Parameter for the RegisterHandler/ReleaseHandler functions
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     struct _SceExcpmgrExceptionHandlerContext *next; // Pointer to the next handler in the chain
     struct _SceExcpmgrExceptionHandlerContext *next; // Pointer to the next handler in the chain
     SceUInt32 must_be_zero; // Unused - probably required for alignement reasons
     SceUInt32 must_be_zero; // Unused - probably required for alignement reasons
     // ARM code of the exception handler goes here. Exception handlers cannot be written in Thumb.
     // Code of the exception handler goes here.
    // This must be the start of a SceExcpmgrExceptionHandler function.
} SceExcpmgrExceptionHandlerContext;
} SceExcpmgrExceptionHandlerContext;


Line 202: Line 202:
Temp name was sceExcpmgrRegisterHandlerForKernel.
Temp name was sceExcpmgrRegisterHandlerForKernel.


Installs an exception handler. The exception handler must be ARM code, and not Thumb code. Allowed <code>priority</code> values are from 0 (most important) to 7 (least important), including them. Specifying priority 0 will install the handler directly in VBAR, which means its code will run directly when an exception raises (and as such needs to build the exception context itself).
Installs an exception handler. The exception handler can be ARM code or Thumb code. Allowed <code>priority</code> values are from 0 (most important) to 7 (least important), including them. Specifying priority 0 will install the handler directly in VBAR, which means its code will run directly when an exception raises (and as such it needs to build the exception context itself).
<code>handler & 0x1</code> must be set if the handler function is Thumb code.


The syscall handler in FW 1.50 is SceExcpmgr_func_0x81000E40.
The syscall handler in FW 1.50 is SceExcpmgr_func_0x81000E40.

Revision as of 18:59, 5 January 2022

SceExcpmgr is a kernel module that sets up exception handling. A version exists in both non-secure and secure worlds. In non-secure world, after the kernel is booted up, the exception handlers pointed to by VBAR all jump into code in this module.

Module

This module exists in both non-secure and secure world. The non-secure world SELF can be found in os0:kd/excpmgr.skprx.

Version World Privilege
0.931-3.65 Non-secure Kernel
0.931-1.69 Secure Kernel

Libraries

This module only exports kernel libraries.

Known NIDs

Version Name World Visibility NID
0.931-3.60 SceExcpmgrForKernel Non-secure Kernel 0x4CA0FDD5
3.65 SceExcpmgrForKernel Non-secure Kernel 0x1496A5B5
0.931-1.80 SceExcpmgrForTZS Secure Kernel 0x8F526F35

Types

// All data in this structure are per-core (field_name[0] belongs to CPU0, field_name[1] to CPU1, etc)
typedef struct _SceExcpmgrData {
    // Incremented by the first exception handler, must be 1 when then decremented before returning from an exception.
    // If not, raise a nested exception kernel panic.
    SceUInt32 nestedExceptionCount[4];
    int unused[4]; // Seemingly unused
    void *ExcpStackTop[4]; // Stack size is 0x1000
    void *ExcpStackBottom[4];
} SceExcpmgrData;

// Exception handlers' prototype
typedef void(SceExcpmgrExceptionHandler)(SceExcpmgrExceptionContext* context, SceExcpmgrExceptionHandlingCode code); //Prototype for non-zero priority handlers
typedef void(SceExcpmgrPriority0ExceptionHandler)(void); //Prototype for priority 0 handlers

// Parameter for the RegisterHandler/ReleaseHandler functions
typedef struct __attribute__((aligned(4))) _SceExcpmgrExceptionHandlerContext {
    struct _SceExcpmgrExceptionHandlerContext *next; // Pointer to the next handler in the chain
    SceUInt32 must_be_zero; // Unused - probably required for alignement reasons
    // Code of the exception handler goes here.
} SceExcpmgrExceptionHandlerContext;

// Structure that holds the CPU's state at the moment when an exception was raised
typedef struct _SceExcpmgrExceptionContext { // Size is 0x400 on FW 3.60
    SceUInt32 r0;
    SceUInt32 r1;
    SceUInt32 r2;
    SceUInt32 r3;
    SceUInt32 r4;
    SceUInt32 r5;
    SceUInt32 r6;
    SceUInt32 r7;
    SceUInt32 r8;
    SceUInt32 r9;
    SceUInt32 r10;
    SceUInt32 r11;
    SceUInt32 r12;
    SceUInt32 sp;
    SceUInt32 lr;
    SceUInt32 pc; // address of faulting instruction (+4)
    SceExcpmgrExceptionCode excode;
    SceUInt32 SPSR;
    SceUInt32 CPACR;
    SceUInt32 FPSCR;
    SceUInt32 FPEXC;
    SceUInt32 CONTEXTIDR;
    SceUInt32 TPIDRURW;
    SceUInt32 TPIDRURO;
    SceUInt32 TPIDRPRW;
    SceUInt32 TTBR1;
    SceUInt32 unused_0x68; // Seemingly not populated
    SceUInt32 DACR;
    SceUInt32 DFSR;
    SceUInt32 IFSR;
    SceUInt32 DFAR;
    SceUInt32 IFAR;
    SceUInt32 PAR;
    SceUInt32 TEEHBR;
    SceUInt32 PMCR;
    SceUInt32 PMCNTENSET;
    SceUInt32 PMCNTENSET_2; // Second copy of PMCNTENSET
    SceUInt32 PMSELR;
    SceUInt32 PMCCNTR;
    SceUInt32 PMUSERENR;
    SceUInt32 PMXEVTYPER0;
    SceUInt32 PMXEVCNTR0;
    SceUInt32 PMXEVTYPER1;
    SceUInt32 PMXEVCNTR1;
    SceUInt32 PMXEVTYPER2;
    SceUInt32 PMXEVCNTR2;
    SceUInt32 PMXEVTYPER3;
    SceUInt32 PMXEVCNTR3;
    SceUInt32 PMXEVTYPER4;
    SceUInt32 PMXEVCNTR4;
    SceUInt32 PMXEVTYPER5;
    SceUInt32 PMXEVCNTR5;
    SceUInt32 unused_0xD0;
    SceUInt32 unk_0xD4;         // Comes from SceVfpIntRegs[localCore].field_0x100
    SceUInt32 DBGSCRext;
    SceUInt32 unused_0xDC[9];  // Seemingly not populated
    SceUInt64 VFP_registers[32]; // Content of registers d0-d31
    SceUInt32 unk_0x200[128];       // Comes from SceVfpIntRegs[localCore].field_0x200
} SceExcpmgrExceptionContext;

typedef enum {
    // For all codes != 3, calling the last handler in the chain should call sceKernelSysrootReturnFromExcpToThreadForKernel and return properly
    SCE_EXCPMGR_EXCEPTION_HANDLING_CODE_0 = (int16_t)0,
    SCE_EXCPMGR_EXCEPTION_HANDLING_CODE_1 = (int16_t)1,
    SCE_EXCPMGR_EXCEPTION_HANDLING_CODE_2 = (int16_t)2,
    // If this code reaches the last handler in the chain, calls SceDebugForKernel_082B8D6A then loops infinitely
    SCE_EXCPMGR_EXCEPTION_NOT_HANDLED_FATAL = (int16_t)3,
    SCE_EXCPMGR_EXCEPTION_HANDLING_CODE_4 = (int16_t)4
} SceExcpmgrExceptionHandlingCode;

typedef enum {
    SCE_EXCPMGR_EXCEPTION_CODE_RESET = 0, // Reset
    SCE_EXCPMGR_EXCEPTION_CODE_UNDEF = 1, // Undefined Instruction
    SCE_EXCPMGR_EXCEPTION_CODE_SVC = 2, // Supervisor Call
    SCE_EXCPMGR_EXCEPTION_CODE_PABT = 3, // Prefetch Abort
    SCE_EXCPMGR_EXCEPTION_CODE_DABT = 4, // Data Abort
    SCE_EXCPMGR_EXCEPTION_CODE_RESERVED = 5, // Reserved
    SCE_EXCPMGR_EXCEPTION_CODE_IRQ = 6, // Interrupt
    SCE_EXCPMGR_EXCEPTION_CODE_FIQ = 7, // Fast Interrupt
} SceExcpmgrExceptionCode;

typedef struct SceExcpmgrRegistersSave { // Size is at least 0x194 on FW 0.931
    SceUInt32 FPEXC; // -0x190
    SceUInt32 FPSCR; // -0x18C
    SceUInt32 unk_0x188; // -0x188
    SceUInt32 unk_0x88[64]; // -0x88
    SceUInt32 unk_0x84; // -0x84
    SceUInt32 TPIDRURO; // -0x80
    SceUInt32 TPIDRPRW; // -0x7C
    SceUInt32 unk_0x78; // -0x78
    SceUInt32 unk_0x74; // -0x74
    SceUInt32 context_id; // -0x70
    SceUInt32 unk_0x6C; // -0x6C
    SceUInt32 unk_0x68; // -0x68
    SceUInt32 unk_0x64; // -0x64
    SceUInt32 unk_0x60; // -0x60
    SceUInt32 unk_0x5C; // -0x5C
    SceUInt32 unk_0x58; // -0x58
    SceUInt32 unk_0x54; // -0x54
    SceUInt32 unk_0x50; // -0x50
    SceUInt32 unk_0x4C; // -0x4C
    SceUInt32 unk_0x48; // -0x48
    SceUInt32 r0; // -0x44
    SceUInt32 r1;
    SceUInt32 r2;
    SceUInt32 r3;
    SceUInt32 r4;
    SceUInt32 r5;
    SceUInt32 r6;
    SceUInt32 r7;
    SceUInt32 r8;
    SceUInt32 r9;
    SceUInt32 r10;
    SceUInt32 r11;
    SceUInt32 r12;
    SceUInt32 sp;
    SceUInt32 lr;
    SceUInt32 pc;
    SceUInt32 CPSR; // -0x4
    SceUInt32 unk_0; // -0x0
} SceExcpmgrRegistersSave;

To find

Functions with the following names may exist in SceExcpmgr : 

   sceKernelDefaultHandlerCfunc
   sceKernelDefaultHandlerSvcCfunc
   sceKernelDefaultHandlerIrqCfunc
   sceKernelDefaultHandlerReservedCfunc
   sceKernelPanicHandlerUndefCfunc
   sceKernelPanicHandlerDabtCfunc
   sceKernelPanicHandlerPabtCfunc

SceExcpmgrForKernel

sceKernelRegisterExceptionHandlerForKernel

Version NID
0.990-3.60 0x03499636
3.65 0x00063675

Temp name was sceExcpmgrRegisterHandlerForKernel.

Installs an exception handler. The exception handler can be ARM code or Thumb code. Allowed priority values are from 0 (most important) to 7 (least important), including them. Specifying priority 0 will install the handler directly in VBAR, which means its code will run directly when an exception raises (and as such it needs to build the exception context itself). handler & 0x1 must be set if the handler function is Thumb code.

The syscall handler in FW 1.50 is SceExcpmgr_func_0x81000E40. 

int sceKernelRegisterExceptionHandlerForKernel(SceExcpmgrExceptionCode excode, SceUInt32 priority, SceExcpmgrExceptionHandlerContext *handler);

sceKernelRegisterDefaultExceptionHandlerForKernel

Version NID
0.931-3.60 0xFFCCB5F9
3.65 0x416C0E20

Installs an exception handler for all exceptions. If no exception handler is already installed for an exception, the handler will be installed in the VBAR. handler must be the same parameter that would be passed to sceKernelRegisterExceptionHandlerForKernel. 

int sceKernelRegisterDefaultExceptionHandlerForKernel(SceExcpmgrExceptionHandlerContext *handler);

sceKernelReleaseExceptionHandlerForKernel

Version NID
0.990-3.60 0xE04AE286

Uninstalls an exception handler.

Pass the same arguments as provided to sceKernelRegisterExceptionHandlerForKernel. 

int sceKernelReleaseExceptionHandlerForKernel(SceExcpmgrExceptionCode excode, SceExcpmgrExceptionHandlerContext *handler);

sceKernelReleaseDefaultExceptionHandlerForKernel

Version NID
0.990 0x917A6D2B
3.60 not present

sceKernelInitialHandlerDebugUndefCfuncForKernel

Version NID
0.931-3.60 0xB77DCBD6

Logs some information about the CPU state and backtrace then returns. Freezes with an infinite loop if currentHandlerIndex is superior to 1. 

void sceKernelInitialHandlerDebugUndefCfuncForKernel(SceExcpmgrExceptionContext* context);

sceKernelInitialHandlerDebugPabtCfuncForKernel

Version NID
0.931-3.60 0x25C0C91B

Logs some information about the CPU state and backtrace then returns. Freezes with an infinite loop if currentHandlerIndex is superior to 1. 

void sceKernelInitialHandlerDebugPabtCfuncForKernel(SceExcpmgrExceptionContext* context);

sceKernelInitialHandlerDebugDabtCfuncForKernel

Version NID
0.990-3.60 0xFFFA3353

Logs some information about the CPU state and backtrace then returns. Freezes with an infinite loop if currentHandlerIndex is superior to 1. 

void sceKernelInitialHandlerDebugDabtCfuncForKernel(SceExcpmgrExceptionContext* context);

sceKernelPanicHandlerReturnFromNestedExceptionCfuncForKernel

Version NID
0.931-3.60 0xD17EEE40 
void sceKernelPanicHandlerReturnFromNestedExceptionCfuncForKernel(SceExcpmgrExceptionContext* context);

sceKernelDefaultHandlerResetCfuncForKernel

Version NID
0.990-3.60 0xA90AC525
3.65 0x4337DD78

Returns a pointer to the handler previously registered by sceKernelRegisterDefaultExceptionHandlerForKernel. 

SceExcpmgrExceptionHandlerContext *sceKernelDefaultHandlerResetCfuncForKernel(void);

sceKernelGetExcpStackBottomForKernel

Version NID
0.990-3.60 0x4C603645
3.65 0x5420ED8F

Returns the exception stack bottom for specified CPU core. The stack bottom is the highest address of the stack.

Reimplementation code: 

void* sceKernelGetExcpStackBottomForKernel(int coreNum) {
    return sceKernelGetExcpDataForKernel()->ExcpStackBottom[coreNum];
}
void* sceKernelGetExcpStackBottomForKernel(int coreNum);

sceKernelGetExcpDataForKernel

Version NID
0.931-0.990 not present
3.60 0x08CB30E6

This is a guessed name. Temp name was sceExcpmgrGetDataForKernel.

Get exception data pointer (for use by handlers). 

SceExcpmgrData* sceKernelGetExcpDataForKernel(void);

SceExcpmgrForKernel_3AE9AEE1

Version NID
0.931-0.990 not present
3.60 0x3AE9AEE1

Sets a callback function ran by the default UNDEF exception handler before calling the next handler in the chain. 

// NOTE : context passed to callback lacks VFP registers
void SceExcpmgrForKernel_3AE9AEE1(void (*callback)(SceExcpmgrExceptionContext*));

SceExcpmgrForKernel_4FF90618

Version NID
0.990-3.60 0x4FF90618

Sets whether or not watchpoint control debug registers (DBGWCR0-DBGWCR4) should be left untouched by the UNDEF/DABT/PABT handlers. Registers are otherwise zero'ed out. 

void SceExcpmgrForKernel_4FF90618(SceBool keepRegisters);

SceExcpmgrForKernel_7ADF11DB

Version NID
0.931-0.990 not present
3.60 0x7ADF11DB

Sets a callback function ran by the default DABT exception handler before calling the next handler in the chain. 

// NOTE : context passed to callback lacks VFP registers
void SceExcpmgrForKernel_7ADF11DB(void (*callback)(SceExcpmgrExceptionContext*));

SceExcpmgrForKernel_8D223205

Version NID
0.931-0.990 not present
3.60 0x8D223205
3.65 0x58F7212B

Sets a callback function ran by the default PABT exception handler before calling the next handler in the chain. 

// NOTE : context passed to callback lacks VFP registers
void SceExcpmgrForKernel_8D223205(void (*callback)(SceExcpmgrExceptionContext*));

SceExcpmgrForKernel_A66DDFA3

Version NID
0.990-3.60 0xA66DDFA3

Sets whether or not breakpoint control debug registers (DBGBCR0-DBGBCR5) should be left untouched by the UNDEF/DABT/PABT handlers. Registers are otherwise zero'ed out. 

void SceExcpmgrForKernel_A66DDFA3(SceBool keepRegisters);

SceExcpmgrForKernel_C45C0D3D

Version NID
0.931-0.990 not present
3.60 0xC45C0D3D

Set the "memory access error range". If a DABT exception occurs and PC is located in the range (inclusive) provided by this function, a subroutine of the default DABT handler will return SCE_KERNEL_ERROR_INVALID_MEMORY_ACCESS which in turn makes the handler return to the instruction right after the faulting one. 

void SceExcpmgrForKernel_C45C0D3D(uintptr_t rangeStart, uintptr_t rangeStop);

SceExcpmgrForKernel_D464A9A7

Version NID
0.931-3.60 0xD464A9A7

Returns the current nested exception count, or 0 if current TPIDRPRW is non-NULL. 

int SceExcpmgrForKernel_D464A9A7(void);

SceExcpmgrForTZS

SceExcpmgrForTZS_get_default_excp_handler

Version NID
0.931-1.80 0x07A5790B 
void *SceExcpmgrForTZS_get_default_excp_handler(void);

sceKernelReleaseExceptionHandlerForTZS

Version NID
0.931-1.80 0x166C9362 
int sceKernelReleaseExceptionHandlerForTZS(SceExcpmgrExceptionCode excode, SceExcpmgrExceptionHandlerContext *handler)

sceKernelReleaseDefaultExceptionHandlerForTZS

Version NID
0.931-1.80 0x6282E52C 
int sceKernelReleaseDefaultExceptionHandlerForTZS(SceExcpmgrExceptionHandlerContext *handler)

sceKernelRegisterDefaultExceptionHandlerForTZS

Version NID
0.931-1.80 0xA0434735 
int sceKernelRegisterDefaultExceptionHandlerForTZS(SceExcpmgrExceptionHandlerContext *handler)

sceKernelRegisterMonitorEntryForTZS

Version NID
0.931-3.60 0xAC297406 
int sceKernelRegisterMonitorEntryForTZS(SceExcpmgrExceptionCode excode, SceExcpmgrExceptionHandlerContext *handler);

sceKernelRegisterExceptionHandlerForTZS

Version NID
0.931-1.80 0xDD4C680D 
int sceKernelRegisterExceptionHandlerForTZS(SceExcpmgrExceptionCode excode, SceUInt32 priority, SceExcpmgrExceptionHandlerContext *handler);

Exceptions

SVC

SVC (Supervisor Call), more commonly called Syscalls (system calls), is what allows to interact with non-secure kernel from usermode.

The SVC interface is defined in non-secure kernel as:

Register Value
R0 First argument
R1 Second argument
R2 Third argument
R3 Fourth argument
R12 Syscall number

On return, R1-R3 and R12 are cleared to 0x0 or 0xDEADBEEF to prevent any data leaks. All user pointers passed to syscalls are accessed with ARM instructions LDRT and STRT for hardware forced permission checks. Syscalls 0x0 - 0xFF are likely a "fastcall" interface that do not mask interrupts or set the DACR, however currently are no such fastcalls defined. Syscalls 0x100 - 0xFFF are made with IRQ interrupts masked and DACR set to 0xFFFF0000 (to prevent access to certain memory domains). Any other syscall numbers are invalid.

System calls are handled in "system" mode defined in ARMv7 (mode 0b11111).

User exported functions loaded by SceKernelModulemgr are exported as syscalls. The number assigned to the syscall are randomized with respect to each library but not within a library. That means, for example, two functions exported by a library will always be some syscall number apart even though that number will change on each boot.

There is no SVC in secure world because all code in secure world is running as kernel.

SMC

SMC (Secure Monitor Call) is what allows to interact with ARM TrustZone from non-secure kernel.

The SMC interface for making a non-secure kernel call to secure kernel is:

Register Value
R0 First argument
R1 Second argument
R2 Third argument
R3 Fourth argument
R12 SMC number

The SMC interface is very similar to the SVC interface. The SMC handler and MVBAR is set up in Secure World by SceExcpmgrForTZS.

0x0 - 0xFF are fast service calls. 0x100 - 0xFFF are normal service calls ran with IRQs masked.

Secure services are ran in ARM system processor mode (0b11111) in the Secure World.

SMC calls are registered by SceIntrmgrForTZS functions.

SMC calls

Number Module Arguments Notes
0x101 
int AllocSharedMemory_S(void *pPA, SceSize size);
0x103 
int FreeSharedMemory_S(void);
 Frees the allocation of virtual ranges: 0x40000000-0x40100000, 0x50000000-0x51000000 and 0x51000000-0x52000000 with UID 0x10007. This is SKBL only and does not affect NSKBL.
0x104 
int PervasiveAccessMode(int mode, SceBool cmd);
 cmd: 0 clear, 1 set
0x105 
int TASAccessMode(int mode, SceBool cmd);
 cmd: 0 clear, 1 set
0x106 
int Pervasive2AccessMode(int mode, SceBool cmd);
 cmd: 0 clear, 1 set
0x107 
int RegbusAccessMode(int mode, SceBool cmd);
 cmd: 0 clear, 1 set
0x10A 
int GetGrabCmpMap(int index);
 Gets GRAB Compatibility Map.
0x10B 
int SetGrabCmpMap(int index, int map);
 Sets GRAB Compatibility Map.
0x10C SceKernelBusError 
int BusErrorDump(void);
 Used by SceKernelBusError when a bus error is handled, just before getting bus error info. Writes bus registers to (shared memory + 0x4000).
0x10D SceKernelBusError 
int BusErrorDump2(void);
 Used by SceKernelBusError when a bus error is handled, just before getting bus error info. Writes bus registers to (shared memory + 0x6000). Replacement of SMC 0x10C that writes to offset 0x6000 instead of 0x4000 and calls sceKernelDcacheCleanInvalidateRange before returning.
0x10E SceKernelBusError 
int BusErrorClear(void);
 On FW 0.931, prints a tree of all bus states. On FW 3.60, does nothing and return 0.
0x10F 
int smc_ple_flush_kill_and_l1_dcache_clean_invalidate_all(void);
 Flushes (and kills if there is activity) the PLE (Preload Engine) and then cleans and invalidates all the L1 Dcache.
0x110 SceDriverTzs 
int smc_bus_set_state(int bus, int command);
 bus: 1 -> used by SceEnumWakeUp, 2 -> used to enable/disable some things used by the PSP Emulator; maybe CPU, or memory for example. Command: 0 (stop), 1 (start), 2 (LCD DMAC init).
0x111 SceDriverTzs Related to bus.
0x113 SceDriverTzs Related to bus.
0x114 SceDriverTzs 
int smc_bus_freq_op(SceUInt32 op, SceUInt32 freq_level);
 op: 0 - Set bus frequency, 1 - Get bus frequency, 2 - Set GPU Xbar frequency, 3 - Get GPU Xbar frequency
0x117 SceDriverTzs 
int smc_cdram_enable(void);
 Seems to enable the CDRAM (by using the SceEmcTop registers).
0x118 SceDriverTzs 
int smc_0x118(void);
 Seems to enable something CDRAM related.
0x119 SceDriverTzs 
int smc_0x119(void);
 Seems to disable something CDRAM related.
0x11A SceDriverTzs 
int sceSysconSetPowerMode(int type, int mode);
 Set power mode. See sceSysconSetPowerModeForDriver.
0x11B SceDriverTzs 
int smc_0x11B(int mode, SceBool cmd);
 mode: must be < 0x1000, cmd: 0 set, 1 clear
0x11C SceDriverTzs 
int smc_0x11C(SceUInt32 handle, SceInt32 value);
 Used by SceLowio#SceGrabForDriver_188BBCC8.
0x11D SceDriverTzs 
int smc_compat_set_memory_bank_start_paddr(int bank, void *pPA);
 Valid banks: 0-7, and physical addresses: 0x20000000-0x2FFFFFFF and 0x42800000-0x7FFFFFFF.
0x11E SceDriverTzs 
int smc_compat_set_state_ex(int command, int ex);
 Replacement for SMC 0x110. Used to enable/disable some things used by the PSP Emulator. Maybe the CPU, or memory for example. Command: 0 (stop), 1 (start), 2 (LCD DMAC init). Ex is only used for start (maybe for resume/suspend).
0x11F SceDriverTzs 
int smc_0x11F(int unk);
 Valid unk: 1-3. Waits something like a semaphore.
0x120 SceDriverTzs 
int smc_compat_get_memory_bank_start_paddr(int bank);
 Valid banks 0-7.
0x121 SceDriverTzs 
int smc_0x121(int bank1, int bank2);
 Valid banks 0-7.
0x122 SceDriverTzs 
int smc_intr_crash(int type, void *pTTBR0, void *pVBAR, void *pSysbase);
 type: 0 (exception), 1 (panic_or_assertion_failed)
0x12D 
int sceSblSmSchedInvoke(SceBool priority, void *sm_self_paddr, SceUInt32 num_pa_range, SceSblTzsBridgeArgArea area);
 Used by sceSblSmSchedProxyInvokeForKernel.
0x12E 
int sceSblSmSchedWait(SceSmSchedRequestId req_id, SceSblTzsBridgeArgArea area);
 Used by sceSblSmSchedProxyWaitForKernel.
0x12F 
int sceSblSmSchedGetStatus(SceSmSchedRequestId req_id, SceSblTzsBridgeArgArea area);
 Used by sceSblSmSchedProxyGetStatusForKernel.
0x130 
int sceSblSmSchedKill(SceSmSchedRequestId req_id);
 Used by sceSblSmSchedProxyKillForKernel.
0x131 Reserved (on FWs 0.931-3.60).
0x132 Reserved (on FWs 0.931-3.60).
0x133 
int smc_sm_sched_proxy_call_func(SceSmSchedRequestId req_id, int mailbox_id, SceUInt32 mailval);
 Used by sceSblSmSchedProxyCallFuncForKernel. mailval is paddr(SceSblSmschedCallFuncCommand) | 1.
0x134 
int sceSblSmSchedReadArm2Cry(SceSmSchedRequestId req_id, int mailbox_id, SceUInt32 *pMailval);
 Used by sceSblSmSchedProxyReadArm2CryForKernel.
0x135 
int sceSblSmSchedWriteArm2Cry(SceSmSchedRequestId req_id, int mailbox_id, SceUInt32 mailval);
 Used by sceSblSmSchedProxyWriteArm2CryForKernel.
0x136 
int sceSblSmSchedWriteCry2Arm(SceSmSchedRequestId req_id, int mailbox_id, SceUInt32 mailval);
 Used by sceSblSmSchedProxyWriteCry2ArmForKernel.
0x137 
int sceSblSmSchedReadCry2Arm(SceSmSchedRequestId req_id, int mailbox_id, SceUInt32 *pMailval);
 Used by sceSblSmSchedProxyReadCry2ArmForKernel.
0x138 
int sceSblSmSchedRegisterIntrHandler(SceSmSchedRequestId req_id, int mailbox_id);
 Used by sceSblSmSchedProxyRegisterIntrHandlerForKernel.
0x139 
int sceSblSmSchedReleaseIntrHandler(SceSmSchedRequestId req_id, int mailbox_id);
 Used by sceSblSmSchedProxyReleaseIntrHandlerForKernel.
0x13A 
int smc_sm_sched_proxy_enable_all_cry2arm_interrupts(SceSmSchedRequestId req_id, int mailbox_id, SceSblTzsBridgeArgArea area);
 Interrupt Cry2Arm set enable.
0x13B 
int smc_sm_sched_proxy_uninitialize(void);
 Interrupt Cry2Arm clear enable. Used by sceSblSmSchedProxyUninitializeForKernel.
0x13C 
int smc_sm_sched_proxy_execute_sk_command(sk_cmd_index cmd_index);
 Executes a Secure Kernel command. Used by sceSblSmSchedProxyExecuteSKCommandForKernel.
0x168 
int smc_0x168_dmac(int index, int value);
 SceDmacmgrDmac related. Writes value to SceDmacmgrDmacN + 0x100. Maybe key_id related.
0x169 
int smc_0x169_dmac(int index, int value);
 SceDmacmgrDmac related. Writes value to SceDmacmgrDmacN + 0x104. Maybe key_id related.
0x16A 
int smc_l2_write_control_register(int value);
 Flushes and invalidates the entire L2 Cache (Clean and Invalidate by Way with way = 0xFFFF, offset 0x7FC), then performs an L2 Cache Sync (offset 0x730), and finally writes value to the L2 Control Register (offset 0x100).
0x16B 
int smc_l2_write_auxiliary_control_register(int value);
 Writes value to the L2 Auxiliary Control Register (offset 0x104).

Aborts

On development units, data and prefetch aborts can handle BKPT instruction for software breakpoints. SceDebug uses this to handle usermode breakpoints. There is no built-in support for BKPT in kernel code.

SceSysmem uses data aborts with the LDRT and STRT instructions to implement user pointer checking. When LDRT/STRT throws a MMU data exception because of an invalid access and the exception came from SceSysmem#sceKernelCopyFromUserForDriver or SceSysmem#sceKernelCopyToUserForDriver or related functions, the data abort handler will resume execution.

IRQ

IRQs are only handled in non-secure world. An IRQ in secure world is fatal. See SceKernelIntrMgr.

FIQ

FIQs are only handled in secure world because of the bit set in the SCR. Because of this, it is likely that secure devices such as the F00D Processor use FIQs to communicate with the Cortex A9 cores. See SceKernelIntrMgr.

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