781a69617b
Defining C structures for the following objects: (1) Remote and local context (2) Stack of system call arguments / return values Change-Id: Iafbb6c795bd765e3c78c54a255d8a1e4d4536288
157 lines
2.5 KiB
ArmAsm
157 lines
2.5 KiB
ArmAsm
/*
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Calling convention:
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arg: rdi, rsi, rdx, rcx, r8, r9
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ret: rax
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rdi: fd
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rsi: cmd
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rdx: param
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rcx: save area
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r8: new thread context
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Syscam call convention:
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syscall number: rax
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arg: rdi, rsi, rdx, r10, r8, r9
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return addr: rcx
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rdi: fd
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rsi: cmd
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rdx: param
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*/
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.global switch_ctx
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switch_ctx:
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movq $0,0x00(%rcx)
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movq %rax,0x8(%rcx)
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movq %rbx,0x10(%rcx)
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movq %rcx,0x18(%rcx)
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movq %rdx,0x20(%rcx)
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movq %rsi,0x28(%rcx)
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movq %rdi,0x30(%rcx)
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movq %rbp,0x38(%rcx)
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movq %r8,0x40(%rcx)
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movq %r9,0x48(%rcx)
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movq %r10,0x50(%rcx)
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movq %r11,0x58(%rcx)
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movq %r12,0x60(%rcx)
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movq %r13,0x68(%rcx)
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movq %r14,0x70(%rcx)
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movq %r15,0x78(%rcx)
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pushfq
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popq %rax
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movq %rax,0x80(%rcx)
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movq 0x00(%rsp),%rax
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movq %rax,0x88(%rcx)
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movq %rsp,0x90(%rcx)
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movq %rcx,%r10
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pushq %rcx
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pushq %r8
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pushq %rax
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mov $0x10,%eax /* ioctl */
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syscall
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3:
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popq %r8
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popq %r8
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popq %rcx
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movq %r10,%rcx
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cmp $0xfffffffffffff001,%eax
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jae 1f
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test %eax,%eax
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jnz 2f
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pushq %rax
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movq $158,%rax /* arch_prctl */
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movq $0x1002,%rdi /* ARCH_SET_FS */
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movq 0x98(%r8),%rsi
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syscall
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popq %rax
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movq 0x10(%r8),%rbx
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movq 0x18(%r8),%rcx
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movq 0x20(%r8),%rdx
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movq 0x28(%r8),%rsi
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movq 0x30(%r8),%rdi
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movq 0x38(%r8),%rbp
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movq 0x48(%r8),%r9
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movq 0x50(%r8),%r10
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movq 0x58(%r8),%r11
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movq 0x60(%r8),%r12
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movq 0x68(%r8),%r13
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movq 0x70(%r8),%r14
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movq 0x78(%r8),%r15
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movq 0x80(%r8),%rax
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pushq %rax
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popfq
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movq 0x90(%r8),%rsp
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// movq 0x8(%r8),%rax /* for interrupts */
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movq 0x40(%r8),%r8
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movq $0,%rax /* ioctl return */
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pushq %rcx
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retq
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1:
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mov $0xffffffffffffffff,%eax
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retq
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2:
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pushq %rax
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movq $158,%rax /* arch_prctl */
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movq $0x1002,%rdi /* ARCH_SET_FS */
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movq 0x98(%rcx),%rsi
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syscall
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popq %rax
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movq 0x10(%rcx),%rbx
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movq 0x28(%rcx),%rsi
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movq 0x30(%rcx),%rdi
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movq 0x38(%rcx),%rbp
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movq 0x40(%rcx),%r8
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movq 0x48(%rcx),%r9
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movq 0x50(%rcx),%r10
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movq 0x58(%rcx),%r11
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movq 0x60(%rcx),%r12
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movq 0x68(%rcx),%r13
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movq 0x70(%rcx),%r14
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movq 0x78(%rcx),%r15
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movq 0x80(%rcx),%rdx
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pushq %rdx
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popfq
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movq 0x20(%rcx),%rdx
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movq 0x18(%rcx),%rcx
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retq
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/*
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arg: rdi, rsi, rdx, rcx, r8, r9
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ret: rax
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unsigned long
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compare_and_swap(unsigned long *addr, unsigned long old, unsigned long new);
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rdi: addr
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rsi: old
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rdx: new
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RET: old value
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*/
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.global compare_and_swap
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compare_and_swap:
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movq %rsi,%rax
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lock
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cmpxchgq %rdx,0(%rdi)
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retq
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/*
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unsigned int
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compare_and_swap_int(unsigned int *addr, unsigned int old, unsigned int new);
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ret: old value
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*/
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.global compare_and_swap_int
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compare_and_swap_int:
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movl %esi,%eax
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lock
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cmpxchgl %edx,0(%rdi)
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retq
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