あなたの質問よりも一般的な回答です。
Linux では man syscall (2) さまざまなアーキテクチャでシステム コールを作成する方法を調べる良い出発点となります。
そのマンページからコピー:
Architecture calling conventions
Every architecture has its own way of invoking and passing arguments
to the kernel. The details for various architectures are listed in
the two tables below.
The first table lists the instruction used to transition to kernel
mode (which might not be the fastest or best way to transition to the
kernel, so you might have to refer to vdso(7)), the register used to
indicate the system call number, the register used to return the sys‐
tem call result, and the register used to signal an error.
arch/ABI instruction syscall # retval error Notes
────────────────────────────────────────────────────────────────────
alpha callsys v0 a0 a3 [1]
arc trap0 r8 r0 -
arm/OABI swi NR - a1 - [2]
arm/EABI swi 0x0 r7 r0 -
arm64 svc #0 x8 x0 -
blackfin excpt 0x0 P0 R0 -
i386 int $0x80 eax eax -
ia64 break 0x100000 r15 r8 r10 [1]
m68k trap #0 d0 d0 -
microblaze brki r14,8 r12 r3 -
mips syscall v0 v0 a3 [1]
nios2 trap r2 r2 r7
parisc ble 0x100(%sr2, %r0) r20 r28 -
powerpc sc r0 r3 r0 [1]
riscv scall a7 a0 -
s390 svc 0 r1 r2 - [3]
s390x svc 0 r1 r2 - [3]
superh trap #0x17 r3 r0 - [4]
sparc/32 t 0x10 g1 o0 psr/csr [1]
sparc/64 t 0x6d g1 o0 psr/csr [1]
tile swint1 R10 R00 R01 [1]
x86-64 syscall rax rax - [5]
x32 syscall rax rax - [5]
xtensa syscall a2 a2 -
Notes:
[1] On a few architectures, a register is used as a boolean (0
indicating no error, and -1 indicating an error) to signal
that the system call failed. The actual error value is still
contained in the return register. On sparc, the carry bit
(csr) in the processor status register (psr) is used instead
of a full register.
[2] NR is the system call number.
[3] For s390 and s390x, NR (the system call number) may be passed
directly with svc NR if it is less than 256.
[4] On SuperH, the trap number controls the maximum number of
arguments passed. A trap #0x10 can be used with only 0-argu‐
ment system calls, a trap #0x11 can be used with 0- or
1-argument system calls, and so on up to trap #0x17 for
7-argument system calls.
[5] The x32 ABI uses the same instruction as the x86-64 ABI and
is used on the same processors. To differentiate between
them, the bit mask __X32_SYSCALL_BIT is bitwise-ORed into the
system call number for system calls under the x32 ABI. Both
system call tables are available though, so setting the bit
is not a hard requirement.
The second table shows the registers used to pass the system call
arguments.
arch/ABI arg1 arg2 arg3 arg4 arg5 arg6 arg7 Notes
──────────────────────────────────────────────────────────────
alpha a0 a1 a2 a3 a4 a5 -
arc r0 r1 r2 r3 r4 r5 -
arm/OABI a1 a2 a3 a4 v1 v2 v3
arm/EABI r0 r1 r2 r3 r4 r5 r6
arm64 x0 x1 x2 x3 x4 x5 -
blackfin R0 R1 R2 R3 R4 R5 -
i386 ebx ecx edx esi edi ebp -
ia64 out0 out1 out2 out3 out4 out5 -
m68k d1 d2 d3 d4 d5 a0 -
microblaze r5 r6 r7 r8 r9 r10 -
mips/o32 a0 a1 a2 a3 - - - [1]
mips/n32,64 a0 a1 a2 a3 a4 a5 -
nios2 r4 r5 r6 r7 r8 r9 -
parisc r26 r25 r24 r23 r22 r21 -
powerpc r3 r4 r5 r6 r7 r8 r9
riscv a0 a1 a2 a3 a4 a5 -
s390 r2 r3 r4 r5 r6 r7 -
s390x r2 r3 r4 r5 r6 r7 -
superh r4 r5 r6 r7 r0 r1 r2
sparc/32 o0 o1 o2 o3 o4 o5 -
sparc/64 o0 o1 o2 o3 o4 o5 -
tile R00 R01 R02 R03 R04 R05 -
x86-64 rdi rsi rdx r10 r8 r9 -
x32 rdi rsi rdx r10 r8 r9 -
xtensa a6 a3 a4 a5 a8 a9 -
Notes:
[1] The mips/o32 system call convention passes arguments 5
through 8 on the user stack.
Note that these tables don't cover the entire calling convention—some
architectures may indiscriminately clobber other registers not listed
here.
したがって、システムが OABI を使用するか EABI を使用するかによって異なります。
したがって、EABI では r7 を使用します システム コール番号を渡すには、r0-r6 を使用します 引数を渡すには、SWI 0 を使用します システムコールを行うには、結果が r0 になることを期待してください .
OABI では、SWI <number> を使用する以外はすべて同じです。 システムコールを行います。
ARM の世界では、software interrupt を実行します。 (カーネルにシグナルを送るメカニズム) by supervisor call / svc (以前は SWI と呼ばれていました)。
ARM アセンブリ (UAL) の構文は次のようになります:
SVC{<c>}{<q>} {#}<imm>
(Linux では #0 を渡す必要があります)
bionic や uClibc などの他のプロジェクトからごまかす必要があります。
n900 での hello world の逆アセンブリは svc #0 を示しています
http://brnz.org/hbr/?m=201102