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tools/nolibc: MIPS: add support for N64 and N32 ABIs

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Add support for the MIPS 64bit N64 and ILP32 N32 ABIs.

In addition to different byte orders and ABIs there are also different
releases of the MIPS architecture. To avoid blowing up the test matrix,
only add a subset of all possible test combinations.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Tested-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Link: https://lore.kernel.org/r/20250623-nolibc-mips-n32-v3-4-6ae2d89f4259@weissschuh.net
This commit is contained in:
Thomas Weißschuh 2025-06-23 23:25:39 +02:00
parent 69891dca80
commit a6a2a8a429
3 changed files with 117 additions and 16 deletions
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105
tools/include/nolibc/arch-mips.h
View file

@ -10,7 +10,7 @@
#include "compiler.h"
#include "crt.h"
#if !defined(_ABIO32)
#if !defined(_ABIO32) && !defined(_ABIN32) && !defined(_ABI64)
#error Unsupported MIPS ABI
#endif
@ -32,11 +32,32 @@
* - the arguments are cast to long and assigned into the target registers
* which are then simply passed as registers to the asm code, so that we
* don't have to experience issues with register constraints.
*
* Syscalls for MIPS ABI N32, same as ABI O32 with the following differences :
* - arguments are in a0, a1, a2, a3, t0, t1, t2, t3.
* t0..t3 are also known as a4..a7.
* - stack is 16-byte aligned
*/
#if defined(_ABIO32)
#define _NOLIBC_SYSCALL_CLOBBERLIST \
"memory", "cc", "at", "v1", "hi", "lo", \
"t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7", "t8", "t9"
#define _NOLIBC_SYSCALL_STACK_RESERVE "addiu $sp, $sp, -32\n"
#define _NOLIBC_SYSCALL_STACK_UNRESERVE "addiu $sp, $sp, 32\n"
#else /* _ABIN32 || _ABI64 */
/* binutils, GCC and clang disagree about register aliases, use numbers instead. */
#define _NOLIBC_SYSCALL_CLOBBERLIST \
"memory", "cc", "at", "v1", \
"10", "11", "12", "13", "14", "15", "24", "25"
#define _NOLIBC_SYSCALL_STACK_RESERVE
#define _NOLIBC_SYSCALL_STACK_UNRESERVE
#endif /* _ABIO32 */
#define my_syscall0(num) \
({ \
@ -44,9 +65,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "r"(_num) \
: _NOLIBC_SYSCALL_CLOBBERLIST \
@ -61,9 +82,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1) \
@ -80,9 +101,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2) \
@ -100,9 +121,9 @@
register long _arg4 __asm__ ("a3"); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r"(_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3) \
@ -120,9 +141,9 @@
register long _arg4 __asm__ ("a3") = (long)(arg4); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4) \
@ -131,6 +152,8 @@
_arg4 ? -_num : _num; \
})
#if defined(_ABIO32)
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("v0") = (num); \
@ -141,10 +164,10 @@
register long _arg5 = (long)(arg5); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"sw %7, 16($sp)\n" \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
@ -164,11 +187,11 @@
register long _arg6 = (long)(arg6); \
\
__asm__ volatile ( \
"addiu $sp, $sp, -32\n" \
_NOLIBC_SYSCALL_STACK_RESERVE \
"sw %7, 16($sp)\n" \
"sw %8, 20($sp)\n" \
"syscall\n" \
"addiu $sp, $sp, 32\n" \
_NOLIBC_SYSCALL_STACK_UNRESERVE \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
@ -178,15 +201,67 @@
_arg4 ? -_num : _num; \
})
#else /* _ABIN32 || _ABI64 */
#define my_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
({ \
register long _num __asm__ ("v0") = (num); \
register long _arg1 __asm__ ("$4") = (long)(arg1); \
register long _arg2 __asm__ ("$5") = (long)(arg2); \
register long _arg3 __asm__ ("$6") = (long)(arg3); \
register long _arg4 __asm__ ("$7") = (long)(arg4); \
register long _arg5 __asm__ ("$8") = (long)(arg5); \
\
__asm__ volatile ( \
"syscall\n" \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5) \
: _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
({ \
register long _num __asm__ ("v0") = (num); \
register long _arg1 __asm__ ("$4") = (long)(arg1); \
register long _arg2 __asm__ ("$5") = (long)(arg2); \
register long _arg3 __asm__ ("$6") = (long)(arg3); \
register long _arg4 __asm__ ("$7") = (long)(arg4); \
register long _arg5 __asm__ ("$8") = (long)(arg5); \
register long _arg6 __asm__ ("$9") = (long)(arg6); \
\
__asm__ volatile ( \
"syscall\n" \
: "=r" (_num), "=r"(_arg4) \
: "0"(_num), \
"r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \
"r"(_arg6) \
: _NOLIBC_SYSCALL_CLOBBERLIST \
); \
_arg4 ? -_num : _num; \
})
#endif /* _ABIO32 */
/* startup code, note that it's called __start on MIPS */
void __start(void);
void __attribute__((weak, noreturn)) __nolibc_entrypoint __no_stack_protector __start(void)
{
__asm__ volatile (
"move $a0, $sp\n" /* save stack pointer to $a0, as arg1 of _start_c */
#if defined(_ABIO32)
"addiu $sp, $sp, -16\n" /* the callee expects to save a0..a3 there */
#endif /* _ABIO32 */
"lui $t9, %hi(_start_c)\n" /* ABI requires current function address in $t9 */
"ori $t9, %lo(_start_c)\n"
#if defined(_ABI64)
"lui $t0, %highest(_start_c)\n"
"ori $t0, %higher(_start_c)\n"
"dsll $t0, 0x20\n"
"or $t9, $t0\n"
#endif /* _ABI64 */
"jalr $t9\n" /* transfer to c runtime */
);
__nolibc_entrypoint_epilogue();

26
tools/testing/selftests/nolibc/Makefile.nolibc
View file

@ -53,6 +53,10 @@ ARCH_ppc64 = powerpc
ARCH_ppc64le = powerpc
ARCH_mips32le = mips
ARCH_mips32be = mips
ARCH_mipsn32le = mips
ARCH_mipsn32be = mips
ARCH_mips64le = mips
ARCH_mips64be = mips
ARCH_riscv32 = riscv
ARCH_riscv64 = riscv
ARCH_s390x = s390
@ -69,6 +73,10 @@ IMAGE_arm = arch/arm/boot/zImage
IMAGE_armthumb = arch/arm/boot/zImage
IMAGE_mips32le = vmlinuz
IMAGE_mips32be = vmlinuz
IMAGE_mipsn32le = vmlinuz
IMAGE_mipsn32be = vmlinuz
IMAGE_mips64le = vmlinuz
IMAGE_mips64be = vmlinuz
IMAGE_ppc = vmlinux
IMAGE_ppc64 = vmlinux
IMAGE_ppc64le = arch/powerpc/boot/zImage
@ -93,6 +101,10 @@ DEFCONFIG_arm = multi_v7_defconfig
DEFCONFIG_armthumb = multi_v7_defconfig
DEFCONFIG_mips32le = malta_defconfig
DEFCONFIG_mips32be = malta_defconfig generic/eb.config
DEFCONFIG_mipsn32le = malta_defconfig generic/64r2.config
DEFCONFIG_mipsn32be = malta_defconfig generic/64r6.config generic/eb.config
DEFCONFIG_mips64le = malta_defconfig generic/64r6.config
DEFCONFIG_mips64be = malta_defconfig generic/64r2.config generic/eb.config
DEFCONFIG_ppc = pmac32_defconfig
DEFCONFIG_ppc64 = powernv_be_defconfig
DEFCONFIG_ppc64le = powernv_defconfig
@ -124,6 +136,10 @@ QEMU_ARCH_arm = arm
QEMU_ARCH_armthumb = arm
QEMU_ARCH_mips32le = mipsel # works with malta_defconfig
QEMU_ARCH_mips32be = mips
QEMU_ARCH_mipsn32le = mips64el
QEMU_ARCH_mipsn32be = mips64
QEMU_ARCH_mips64le = mips64el
QEMU_ARCH_mips64be = mips64
QEMU_ARCH_ppc = ppc
QEMU_ARCH_ppc64 = ppc64
QEMU_ARCH_ppc64le = ppc64
@ -139,6 +155,8 @@ QEMU_ARCH_m68k = m68k
QEMU_ARCH = $(QEMU_ARCH_$(XARCH))
QEMU_ARCH_USER_ppc64le = ppc64le
QEMU_ARCH_USER_mipsn32le = mipsn32el
QEMU_ARCH_USER_mipsn32be = mipsn32
QEMU_ARCH_USER = $(or $(QEMU_ARCH_USER_$(XARCH)),$(QEMU_ARCH_$(XARCH)))
QEMU_BIOS_DIR = /usr/share/edk2/
@ -157,6 +175,10 @@ QEMU_ARGS_arm = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_armthumb = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips32le = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips32be = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mipsn32le = -M malta -cpu 5KEc -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mipsn32be = -M malta -cpu I6400 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips64le = -M malta -cpu I6400 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips64be = -M malta -cpu 5KEc -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc = -M g3beige -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc64 = -M powernv -append "console=hvc0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc64le = -M powernv -append "console=hvc0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
@ -191,6 +213,10 @@ CFLAGS_s390x = -m64
CFLAGS_s390 = -m31
CFLAGS_mips32le = -EL -mabi=32 -fPIC
CFLAGS_mips32be = -EB -mabi=32
CFLAGS_mipsn32le = -EL -mabi=n32 -fPIC -march=mips64r2
CFLAGS_mipsn32be = -EB -mabi=n32 -march=mips64r6
CFLAGS_mips64le = -EL -mabi=64 -march=mips64r6
CFLAGS_mips64be = -EB -mabi=64 -march=mips64r2
CFLAGS_sparc32 = $(call cc-option,-m32)
ifeq ($(origin XARCH),command line)
CFLAGS_XARCH = $(CFLAGS_$(XARCH))

2
tools/testing/selftests/nolibc/run-tests.sh
View file

@ -20,7 +20,7 @@ llvm=
all_archs=(
i386 x86_64
arm64 arm armthumb
mips32le mips32be
mips32le mips32be mipsn32le mipsn32be mips64le mips64be
ppc ppc64 ppc64le
riscv32 riscv64
s390x s390