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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-07-22 01:08:13 -04:00
tools/nolibc: add support for 32-bit parisc
Extend nolibc to target the 32-bit parisc architecture. 64-bit is not yet supported. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Acked-by: Willy Tarreau <w@1wt.eu> Link: https://patch/msgid.link/20260428-nolibc-hppa-v5-2-d843d573111a@weissschuh.net
This commit is contained in:
Thomas Weißschuh
@@ -17,7 +17,7 @@ endif
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# it defaults to this nolibc directory.
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OUTPUT ?= $(CURDIR)/
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architectures := arm arm64 loongarch m68k mips openrisc powerpc riscv s390 sh sparc x86
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architectures := arm arm64 loongarch m68k mips openrisc parisc powerpc riscv s390 sh sparc x86
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arch_files := arch.h $(addsuffix .h, $(addprefix arch-, $(architectures)))
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all_files := \
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alloca.h \
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185
tools/include/nolibc/arch-parisc.h
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185
tools/include/nolibc/arch-parisc.h
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@@ -0,0 +1,185 @@
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/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
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/*
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* parisc/hppa (32-bit) specific definitions for NOLIBC
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* Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
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*/
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#ifndef _NOLIBC_ARCH_PARISC_H
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#define _NOLIBC_ARCH_PARISC_H
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#if defined(__LP64__)
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#error 64-bit not supported
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#endif
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#include "compiler.h"
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#include "crt.h"
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/* Syscalls for parisc :
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* - syscall number is passed in r20
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* - arguments are in r26 to r21
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* - the system call is performed by calling "ble 0x100(%sr2, %r0)",
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* the instruction after that is in the delay slot and executed before
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* the jump to 0x100 actually happens, use it to load the syscall number
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* - syscall return comes in r28
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* - the arguments are cast to long and assigned into the target
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* registers which are then simply passed as registers to the asm code,
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* so that we don't have to experience issues with register constraints.
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*/
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#define _NOLIBC_SYSCALL_CLOBBERLIST \
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"memory", "%r1", "%r2", "%r4", "%r20", "%r29", "%r31"
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#define __nolibc_syscall0(num) \
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({ \
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register long _ret __asm__ ("r28"); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %1, %%r20\n\t" \
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: "=r"(_ret) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21", "%r22", "%r23", "%r24", "%r25", "%r26" \
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); \
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_ret; \
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})
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#define __nolibc_syscall1(num, arg1) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %2, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21", "%r22", "%r23", "%r24", "%r25" \
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); \
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_ret; \
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})
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#define __nolibc_syscall2(num, arg1, arg2) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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register long _arg2 __asm__ ("r25") = (long)(arg2); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %3, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1), "+r"(_arg2) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21", "%r22", "%r23", "%r24" \
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); \
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_ret; \
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})
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#define __nolibc_syscall3(num, arg1, arg2, arg3) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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register long _arg2 __asm__ ("r25") = (long)(arg2); \
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register long _arg3 __asm__ ("r24") = (long)(arg3); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %4, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1), "+r"(_arg2), "+r"(_arg3) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21", "%r22", "%r23" \
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); \
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_ret; \
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})
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#define __nolibc_syscall4(num, arg1, arg2, arg3, arg4) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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register long _arg2 __asm__ ("r25") = (long)(arg2); \
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register long _arg3 __asm__ ("r24") = (long)(arg3); \
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register long _arg4 __asm__ ("r23") = (long)(arg4); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %5, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1), "+r"(_arg2), "+r"(_arg3), "+r"(_arg4) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21", "%r22" \
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); \
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_ret; \
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})
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#define __nolibc_syscall5(num, arg1, arg2, arg3, arg4, arg5) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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register long _arg2 __asm__ ("r25") = (long)(arg2); \
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register long _arg3 __asm__ ("r24") = (long)(arg3); \
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register long _arg4 __asm__ ("r23") = (long)(arg4); \
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register long _arg5 __asm__ ("r22") = (long)(arg5); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %6, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1), "+r"(_arg2), "+r"(_arg3), "+r"(_arg4), \
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"+r"(_arg5) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST, \
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"%r21" \
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); \
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_ret; \
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})
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#define __nolibc_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \
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({ \
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register long _ret __asm__ ("r28"); \
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register long _arg1 __asm__ ("r26") = (long)(arg1); \
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register long _arg2 __asm__ ("r25") = (long)(arg2); \
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register long _arg3 __asm__ ("r24") = (long)(arg3); \
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register long _arg4 __asm__ ("r23") = (long)(arg4); \
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register long _arg5 __asm__ ("r22") = (long)(arg5); \
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register long _arg6 __asm__ ("r21") = (long)(arg6); \
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\
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__asm__ volatile ( \
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"ble 0x100(%%sr2, %%r0)\n\t" \
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"copy %7, %%r20\n\t" \
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: "=r"(_ret), \
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"+r"(_arg1), "+r"(_arg2), "+r"(_arg3), "+r"(_arg4), \
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"+r"(_arg5), "+r"(_arg6) \
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: "r"(num) \
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: _NOLIBC_SYSCALL_CLOBBERLIST \
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); \
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_ret; \
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})
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#ifndef NOLIBC_NO_RUNTIME
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/* startup code */
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void __attribute__((weak, noreturn)) __nolibc_entrypoint __nolibc_no_stack_protector _start(void)
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{
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__asm__ volatile (
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".import $global$\n" /* Set up the dp register */
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"ldil L%$global$, %dp\n"
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"ldo R%$global$(%r27), %dp\n"
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"b _start_c\n" /* Call _start_c, the load below is executed first */
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"ldo -4(%r24), %r26\n" /* The sp register is special on parisc.
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* r24 points to argv. Subtract 4 to get &argc.
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* Pass that as first argument to _start_c.
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*/
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);
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__nolibc_entrypoint_epilogue();
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}
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#endif /* NOLIBC_NO_RUNTIME */
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#endif /* _NOLIBC_ARCH_PARISC_H */
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@@ -30,6 +30,8 @@
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#include "arch-sh.h"
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#elif defined(__or1k__)
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#include "arch-openrisc.h"
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#elif defined(__hppa__)
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#include "arch-parisc.h"
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#else
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#error Unsupported Architecture
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#endif
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@@ -64,6 +64,7 @@ ARCH_s390x = s390
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ARCH_sparc32 = sparc
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ARCH_sparc64 = sparc
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ARCH_sh4 = sh
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ARCH_parisc32 = parisc
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ARCH := $(or $(ARCH_$(XARCH)),$(XARCH))
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# kernel image names by architecture
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@@ -130,6 +131,7 @@ QEMU_ARCH_ppc64le = ppc64
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QEMU_ARCH_loongarch = loongarch64
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QEMU_ARCH_sparc32 = sparc
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QEMU_ARCH_openrisc = or1k
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QEMU_ARCH_parisc32 = hppa
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QEMU_ARCH = $(or $(QEMU_ARCH_$(XARCH)),$(XARCH))
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QEMU_ARCH_USER_ppc64le = ppc64le
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@@ -170,6 +172,7 @@ QEMU_ARGS_sparc64 = -M sun4u -append "console=ttyS0,115200 panic=-1 $(TEST:%=
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QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_sh4 = -M r2d -serial file:/dev/stdout -append "console=ttySC1,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_openrisc = -M virt -m 512M -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS_parisc32 = -M B160L -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
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QEMU_ARGS = -m 1G $(QEMU_ARGS_$(XARCH)) $(QEMU_ARGS_BIOS) $(QEMU_ARGS_EXTRA)
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# OUTPUT is only set when run from the main makefile, otherwise
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@@ -186,6 +189,7 @@ CFLAGS_i386 = $(call cc-option,-m32)
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CFLAGS_x32 = -mx32
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CFLAGS_arm = -marm
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CFLAGS_armthumb = -mthumb -march=armv6t2
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CFLAGS_parisc32 = -mfast-indirect-calls
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CFLAGS_ppc = -m32 -mbig-endian -mno-vsx $(call cc-option,-mmultiple)
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CFLAGS_ppc64 = -m64 -mbig-endian -mno-vsx $(call cc-option,-mmultiple)
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CFLAGS_ppc64le = -m64 -mlittle-endian -mno-vsx $(call cc-option,-mabi=elfv2)
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@@ -29,6 +29,7 @@ all_archs=(
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sparc32 sparc64
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m68k
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sh4
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parisc32
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)
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archs="${all_archs[@]}"
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@@ -118,6 +119,7 @@ crosstool_arch() {
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s390*) echo s390;;
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sparc*) echo sparc64;;
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x32*) echo x86_64;;
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parisc32) echo hppa;;
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*) echo "$1";;
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esac
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}
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@@ -175,6 +177,10 @@ test_arch() {
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fi
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MAKE=(make -f Makefile.nolibc -j"${nproc}" XARCH="${arch}" CROSS_COMPILE="${cross_compile}" LLVM="${llvm}" O="${build_dir}")
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if [ "$arch" = "parisc32" ]; then
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MAKE+=("CROSS32CC=${cross_compile}gcc")
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fi
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case "$test_mode" in
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'system')
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test_target=run
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@@ -187,7 +193,7 @@ test_arch() {
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exit 1
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esac
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printf '%-15s' "$arch:"
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if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" ] && [ "$llvm" = "1" ]; then
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if [ "$arch" = "m68k" -o "$arch" = "sh4" -o "$arch" = "openrisc" -o "$arch" = "parisc32" ] && [ "$llvm" = "1" ]; then
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echo "Unsupported configuration"
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return
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fi
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