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kvisc
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julianb0 2019-07-09 20:16:35 +02:00
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commit e6d0c9ec20
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2 changed files with 15 additions and 19 deletions
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26
ka/ABI
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@ -19,16 +19,16 @@ A function's assembly code looks like this:
ret ret
'N' is the number of local variables used by the function. 'N' is the number of local variables used by the function.
The above code is equivalent to the following, but much faster: The above code is equivalent to the following, but faster:
label: label:
mov [rsp-8], rbp push rbp
lea rbp, [rsp-8] mov rbp, rsp
sub rsp, (N+1)*8 sub rsp, N*8
... ...
... ...
... ...
lea rsp, [rbp+8] mov rsp, rbp
mov rbp, [rbp] pop rbp
ret ret
Between the 'enter' and the 'leave', the stack looks like this: Between the 'enter' and the 'leave', the stack looks like this:
@ -73,7 +73,7 @@ Aside from the DF flag, a function cannot assume anything about the state
of the flags in the FLG register. of the flags in the FLG register.
Passing parameters is done using the following registers, in that order: Passing parameters is done using the following registers, in that order:
ax0-ax9, a10-a31 a0-a15
The stack is never used for argument passing, except for variadic functions, The stack is never used for argument passing, except for variadic functions,
cf the next section. If you need to pass large structures of data, pass cf the next section. If you need to pass large structures of data, pass
@ -81,14 +81,14 @@ their address in an appropriate register.
Return values are passed in 'rax'. If the return value does not fit Return values are passed in 'rax'. If the return value does not fit
and require more registers, use the following registers, in that order: and require more registers, use the following registers, in that order:
rax, rdx, a16-a31 rax, rdx
The following registers are volatile; the calling function cannot assume The following registers are volatile; the calling function cannot assume
that they will be left unmodified by the called function: that they will be left unmodified by the called function:
rax, rcx, rdx, rx8-r31, ax0-a31 rax, rcx, rdx, r8-r15, a0-a15
The following registers are nonvolatile; the called function must preserve them: The following registers are nonvolatile; the called function must preserve them:
rbx, rsi, rdi, nx0-n31, rbp, rsp rbx, rsi, rdi, n0-n15, rbp, rsp
#------------------------------------------------------------------------------# #------------------------------------------------------------------------------#
@ -127,12 +127,10 @@ as an offset register in the [reg+reg(*/+...)] memory formats; in these case,
The following registers can only be used by the supervisor: The following registers can only be used by the supervisor:
- Fast global variables for the supervisor: - Fast global variables for the supervisor:
sa0-sa7 sa0-sa3
- Debugging registers for the supervisor:
dr0-dr7
The following registers cannot be referenced by machine code at all: The following registers cannot be referenced by machine code at all:
px0-px1, fc0-fc2, cr0-cr7 px0-px1, fc0-fc2, cr0-cr3
#------------------------------------------------------------------------------# #------------------------------------------------------------------------------#

8
ka/sys/intr/common.k
View File

@ -2,19 +2,17 @@
; See the LICENSE file in the project root for more information. ; See the LICENSE file in the project root for more information.
TrapHandlers.prolog: TrapHandlers.prolog:
sub rsp, rbp, 32 sub rsp, rbp, 24
mov q[rbp-8], r11 mov q[rbp-8], r11
mov q[rbp-16], r12 mov q[rbp-16], r12
mov q[rbp-24], r13 mov q[rbp-24], r13
cmp q[rsp], r13
crash.z
jmp rax ; go back jmp rax ; go back
TrapHandlers.epilog: TrapHandlers.epilog:
mov r11, q[rbp-8]
mov r12, q[rbp-16]
mov r13, q[rbp-24] mov r13, q[rbp-24]
mov r12, q[rbp-16]
mov r11, q[rbp-8]
mov ax0, r11 mov ax0, r11
call IDT.DoneHandling call IDT.DoneHandling