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edits
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Line 31:
Line 31:
+
MOV R11, #0x1F
MOV R11, #0x1F
MSR CPSR_c, R11 ; Switch to system mode and disable FIQ/IRQ
MSR CPSR_c, R11 ; Switch to system mode and disable FIQ/IRQ
+
+ LDR R9, [R8,#0x48] ; Added in 5.5.0: Check for invalid stack
+ CMP SP, R9
+ BLCS bad_stack
+ LDR R11, [R8,#0x4C]
+ SUB R9, R9, R11
+ CMP SP, R9
+ BCC bad_stack
+
LDR R8, [R8,#0x44]
LDR R8, [R8,#0x44]
LDR R11, =syscall_stack_arg_counts
LDR R11, =syscall_stack_arg_counts
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Line 80:
BL debug_print ; Illegal Instruction:tid=%d,pid=%d,pc=0x%08x,sp=0x%08x
BL debug_print ; Illegal Instruction:tid=%d,pid=%d,pc=0x%08x,sp=0x%08x
B schedule_yield
B schedule_yield
− bad_stack
+ BL disable_interrupts
+ LDR R0, =current_thread_ctx_addr
+ LDR R0, [R0]
+ MOV LR, #6 ; STATE_FAULTED
+ STR LR, [R0,#0x50]
+ MOV R1, SP
+ MOV R2, R10
+ LDR SP, =debug_args_addr
+ BL debug_print_bad_stack ; Bad stack upon making system call:tid=%d,pid=%d,sp=0x%08x,sysCallNum=%d\n
+ B schedule_yield
Syscalls are invoked by way of the invalid instruction handler; syscalls take the form 0xE7F000F0 | (syscall_num << 8). (E.g. E7F000F0 is syscall 0, E7F036F0 is syscall 0x36, etc.).<br>
Syscalls are invoked by way of the invalid instruction handler; syscalls take the form 0xE7F000F0 | (syscall_num << 8). (E.g. E7F000F0 is syscall 0, E7F036F0 is syscall 0x36, etc.).<br>
The IOSU has 0x94 available syscalls with 5.3.2 (the number of installed syscalls can vary between system versions).
The IOSU has 0x94 available syscalls with 5.3.2 (the number of installed syscalls can vary between system versions).