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https://github.com/justinian/jsix.git
synced 2025-12-10 08:24:32 -08:00
11a53e792f
There are a lot of under the hood changes here: - Move syscalls to be a dispatch table, defined by syscalls.inc - Don't need a full process state (push_all) in syscalls now - In push_all, define REGS instead of using offsets - Save TWO stack pointers as well as current saved stack pointer in TCB: - rsp0 is the base of the kernel stack for interrupts - rsp3 is the saved user stack from cpu_data - Update syscall numbers in nulldrv - Some asm-debugging enhancements to the gdb script - fork() still not working
83 lines
1.8 KiB
PHP
83 lines
1.8 KiB
PHP
struc REGS
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.r15 resq 1 ; 0x00
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.r14 resq 1 ; 0x08
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.r13 resq 1 ; 0x10
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.r12 resq 1 ; 0x18
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.r11 resq 1 ; 0x20
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.r10 resq 1 ; 0x28
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.r9 resq 1 ; 0x30
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.r8 resq 1 ; 0x38
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.rdi resq 1 ; 0x40
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.rsi resq 1 ; 0x48
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.rbp resq 1 ; 0x50
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.rbx resq 1 ; 0x58
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.rdx resq 1 ; 0x60
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.rcx resq 1 ; 0x68
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.rax resq 1 ; 0x70
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.int resq 1 ; 0x78
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.err resq 1 ; 0x80
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.rip resq 1 ; 0x88
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.cs3 resq 1 ; 0x90
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.rflags resq 1 ; 0x98
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.rsp3 resq 1 ; 0xa0
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.ss3 resq 1 ; 0xa8
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endstruc
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regs_total_size equ 0xb0
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regs_extra_size equ 0x78
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%macro push_all 0
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sub rsp, regs_extra_size
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mov [rsp + REGS.rax], rax
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mov [rsp + REGS.rcx], rcx
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mov [rsp + REGS.rdx], rdx
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mov [rsp + REGS.rbx], rbx
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mov [rsp + REGS.rbp], rbp
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mov [rsp + REGS.rsi], rsi
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mov [rsp + REGS.rdi], rdi
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mov [rsp + REGS.r8 ], r8
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mov [rsp + REGS.r9 ], r9
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mov [rsp + REGS.r10], r10
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mov [rsp + REGS.r11], r11
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mov [rsp + REGS.r12], r12
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mov [rsp + REGS.r13], r13
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mov [rsp + REGS.r14], r14
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mov [rsp + REGS.r15], r15
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%endmacro
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%macro pop_all 0
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mov rax, [rsp + REGS.rax]
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mov rcx, [rsp + REGS.rcx]
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mov rdx, [rsp + REGS.rdx]
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mov rbx, [rsp + REGS.rbx]
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mov rbp, [rsp + REGS.rbp]
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mov rsi, [rsp + REGS.rsi]
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mov rdi, [rsp + REGS.rdi]
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mov r8, [rsp + REGS.r8 ]
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mov r9, [rsp + REGS.r9 ]
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mov r10, [rsp + REGS.r10]
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mov r11, [rsp + REGS.r11]
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mov r12, [rsp + REGS.r12]
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mov r13, [rsp + REGS.r13]
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mov r14, [rsp + REGS.r14]
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mov r15, [rsp + REGS.r15]
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add rsp, regs_extra_size
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%endmacro
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%macro check_swap_gs 0
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mov rax, [rsp+0x90]
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and rax, 0x03 ; mask out the RPL
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cmp rax, 0x03
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jne %%noswapgs
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swapgs
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%%noswapgs:
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%endmacro
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; vim: ft=asm
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