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LoongArch: Adjust system call for 32BIT/64BIT

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Adjust system call for both 32BIT and 64BIT, including: add the uapi
unistd_{32,64}.h and syscall_table_{32,64}.h inclusion, add sys_mmap2()
definition, change the system call entry routines, etc.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2025-12-08 18:09:17 +08:00
parent 3f63ac8d28
commit 14338e631a
6 changed files with 33 additions and 11 deletions
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1
arch/loongarch/include/asm/Kbuild
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@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
syscall-y += syscall_table_32.h
syscall-y += syscall_table_64.h
generated-y += orc_hash.h

1
arch/loongarch/include/uapi/asm/Kbuild
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@ -1,2 +1,3 @@
# SPDX-License-Identifier: GPL-2.0
syscall-y += unistd_32.h
syscall-y += unistd_64.h

6
arch/loongarch/include/uapi/asm/unistd.h
View File

@ -1,3 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#include <asm/bitsperlong.h>
#if __BITS_PER_LONG == 32
#include <asm/unistd_32.h>
#else
#include <asm/unistd_64.h>
#endif

1
arch/loongarch/kernel/Makefile.syscalls
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@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
# No special ABIs on loongarch so far
syscall_abis_32 +=
syscall_abis_64 +=

22
arch/loongarch/kernel/entry.S
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@ -23,24 +23,24 @@ SYM_CODE_START(handle_syscall)
UNWIND_HINT_UNDEFINED
csrrd t0, PERCPU_BASE_KS
la.pcrel t1, kernelsp
add.d t1, t1, t0
PTR_ADD t1, t1, t0
move t2, sp
ld.d sp, t1, 0
PTR_L sp, t1, 0
addi.d sp, sp, -PT_SIZE
PTR_ADDI sp, sp, -PT_SIZE
cfi_st t2, PT_R3
cfi_rel_offset sp, PT_R3
st.d zero, sp, PT_R0
LONG_S zero, sp, PT_R0
csrrd t2, LOONGARCH_CSR_PRMD
st.d t2, sp, PT_PRMD
LONG_S t2, sp, PT_PRMD
csrrd t2, LOONGARCH_CSR_CRMD
st.d t2, sp, PT_CRMD
LONG_S t2, sp, PT_CRMD
csrrd t2, LOONGARCH_CSR_EUEN
st.d t2, sp, PT_EUEN
LONG_S t2, sp, PT_EUEN
csrrd t2, LOONGARCH_CSR_ECFG
st.d t2, sp, PT_ECFG
LONG_S t2, sp, PT_ECFG
csrrd t2, LOONGARCH_CSR_ESTAT
st.d t2, sp, PT_ESTAT
LONG_S t2, sp, PT_ESTAT
cfi_st ra, PT_R1
cfi_st a0, PT_R4
cfi_st a1, PT_R5
@ -51,7 +51,7 @@ SYM_CODE_START(handle_syscall)
cfi_st a6, PT_R10
cfi_st a7, PT_R11
csrrd ra, LOONGARCH_CSR_ERA
st.d ra, sp, PT_ERA
LONG_S ra, sp, PT_ERA
cfi_rel_offset ra, PT_ERA
cfi_st tp, PT_R2
@ -67,7 +67,7 @@ SYM_CODE_START(handle_syscall)
#endif
move u0, t0
li.d tp, ~_THREAD_MASK
LONG_LI tp, ~_THREAD_MASK
and tp, tp, sp
move a0, sp

13
arch/loongarch/kernel/syscall.c
View File

@ -34,9 +34,22 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long,
return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
}
SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len, unsigned long,
prot, unsigned long, flags, unsigned long, fd, unsigned long, offset)
{
if (offset & (~PAGE_MASK >> 12))
return -EINVAL;
return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> (PAGE_SHIFT - 12));
}
void *sys_call_table[__NR_syscalls] = {
[0 ... __NR_syscalls - 1] = sys_ni_syscall,
#ifdef CONFIG_32BIT
#include <asm/syscall_table_32.h>
#else
#include <asm/syscall_table_64.h>
#endif
};
typedef long (*sys_call_fn)(unsigned long, unsigned long,