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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/parisc/kernel/vdso64
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/kernel/vdso64')
-rw-r--r--arch/parisc/kernel/vdso64/Makefile48
-rwxr-xr-xarch/parisc/kernel/vdso64/gen_vdso_offsets.sh15
-rw-r--r--arch/parisc/kernel/vdso64/note.S2
-rw-r--r--arch/parisc/kernel/vdso64/restart_syscall.S3
-rw-r--r--arch/parisc/kernel/vdso64/sigtramp.S166
-rw-r--r--arch/parisc/kernel/vdso64/vdso64.lds.S109
-rw-r--r--arch/parisc/kernel/vdso64/vdso64_wrapper.S14
7 files changed, 357 insertions, 0 deletions
diff --git a/arch/parisc/kernel/vdso64/Makefile b/arch/parisc/kernel/vdso64/Makefile
new file mode 100644
index 000000000..f3d604579
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/Makefile
@@ -0,0 +1,48 @@
+# List of files in the vdso, has to be asm only for now
+
+obj-vdso64 = note.o sigtramp.o restart_syscall.o
+
+# Build rules
+
+targets := $(obj-vdso64) vdso64.so
+obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
+
+
+ccflags-y := -shared -fno-common -fno-builtin
+ccflags-y += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
+ $(call ld-option, -Wl$(comma)--hash-style=sysv)
+asflags-y := -D__VDSO64__ -s
+
+KBUILD_AFLAGS += -DBUILD_VDSO
+KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
+
+VDSO_LIBGCC := $(shell $(CC) -print-libgcc-file-name)
+
+obj-y += vdso64_wrapper.o
+extra-y += vdso64.lds
+CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
+
+$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so FORCE
+
+# Force dependency (incbin is bad)
+# link rule for the .so file, .lds has to be first
+$(obj)/vdso64.so: $(src)/vdso64.lds $(obj-vdso64) $(VDSO_LIBGCC) FORCE
+ $(call if_changed,vdso64ld)
+
+# assembly rules for the .S files
+$(obj-vdso64): %.o: %.S FORCE
+ $(call if_changed_dep,vdso64as)
+
+# actual build commands
+quiet_cmd_vdso64ld = VDSO64L $@
+ cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $(filter-out FORCE, $^) -o $@
+quiet_cmd_vdso64as = VDSO64A $@
+ cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
+
+# Generate VDSO offsets using helper script
+gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
+quiet_cmd_vdsosym = VDSOSYM $@
+ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
+
+include/generated/vdso64-offsets.h: $(obj)/vdso64.so FORCE
+ $(call if_changed,vdsosym)
diff --git a/arch/parisc/kernel/vdso64/gen_vdso_offsets.sh b/arch/parisc/kernel/vdso64/gen_vdso_offsets.sh
new file mode 100755
index 000000000..37f05cb38
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/gen_vdso_offsets.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+#
+# Match symbols in the DSO that look like VDSO_*; produce a header file
+# of constant offsets into the shared object.
+#
+# Doing this inside the Makefile will break the $(filter-out) function,
+# causing Kbuild to rebuild the vdso-offsets header file every time.
+#
+# Inspired by arm64 version.
+#
+
+LC_ALL=C
+sed -n 's/\([0-9a-f]*\) . __kernel_\(.*\)/\#define vdso64_offset_\2\t0x\1/p'
diff --git a/arch/parisc/kernel/vdso64/note.S b/arch/parisc/kernel/vdso64/note.S
new file mode 100644
index 000000000..bd1fa2359
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/note.S
@@ -0,0 +1,2 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include "../vdso32/note.S"
diff --git a/arch/parisc/kernel/vdso64/restart_syscall.S b/arch/parisc/kernel/vdso64/restart_syscall.S
new file mode 100644
index 000000000..83004451f
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/restart_syscall.S
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include "../vdso32/restart_syscall.S"
diff --git a/arch/parisc/kernel/vdso64/sigtramp.S b/arch/parisc/kernel/vdso64/sigtramp.S
new file mode 100644
index 000000000..66a6d2b24
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/sigtramp.S
@@ -0,0 +1,166 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Signal trampolines for 64 bit processes.
+ *
+ * Copyright (C) 2006 Randolph Chung <tausq@debian.org>
+ * Copyright (C) 2018-2022 Helge Deller <deller@gmx.de>
+ * Copyright (C) 2022 John David Anglin <dave.anglin@bell.net>
+ */
+#include <asm/unistd.h>
+#include <linux/linkage.h>
+#include <generated/asm-offsets.h>
+
+ .text
+
+/* Gdb expects the trampoline is on the stack and the pc is offset from
+ a 64-byte boundary by 0, 4 or 5 instructions. Since the vdso trampoline
+ is not on the stack, we need a new variant with different offsets and
+ data to tell gdb where to find the signal context on the stack.
+
+ Here we put the offset to the context data at the start of the trampoline
+ region and offset the first trampoline by 2 instructions. Please do
+ not change the trampoline as the code in gdb depends on the following
+ instruction sequence exactly.
+ */
+ .align 64
+ .word SIGFRAME_CONTEXT_REGS
+
+/* The nop here is a hack. The dwarf2 unwind routines subtract 1 from
+ the return address to get an address in the middle of the presumed
+ call instruction. Since we don't have a call here, we artifically
+ extend the range covered by the unwind info by adding a nop before
+ the real start.
+ */
+ nop
+
+ .globl __kernel_sigtramp_rt
+ .type __kernel_sigtramp_rt, @function
+__kernel_sigtramp_rt:
+ .proc
+ .callinfo FRAME=ASM_SIGFRAME_SIZE,CALLS,SAVE_RP
+ .entry
+
+.Lsigrt_start = . - 4
+0: ldi 0, %r25 /* (in_syscall=0) */
+ ldi __NR_rt_sigreturn, %r20
+ ble 0x100(%sr2, %r0)
+ nop
+
+1: ldi 1, %r25 /* (in_syscall=1) */
+ ldi __NR_rt_sigreturn, %r20
+ ble 0x100(%sr2, %r0)
+ nop
+.Lsigrt_end:
+ .exit
+ .procend
+ .size __kernel_sigtramp_rt,.-__kernel_sigtramp_rt
+
+ .section .eh_frame,"a",@progbits
+
+/* This is where the mcontext_t struct can be found on the stack. */
+#define PTREGS SIGFRAME_CONTEXT_REGS /* 64-bit process offset is -720 */
+
+/* Register REGNO can be found at offset OFS of the mcontext_t structure. */
+ .macro rsave regno,ofs
+ .byte 0x05 /* DW_CFA_offset_extended */
+ .uleb128 \regno; /* regno */
+ .uleb128 \ofs /* factored offset */
+ .endm
+
+.Lcie:
+ .long .Lcie_end - .Lcie_start
+.Lcie_start:
+ .long 0 /* CIE ID */
+ .byte 1 /* Version number */
+ .stringz "zRS" /* NUL-terminated augmentation string */
+ .uleb128 4 /* Code alignment factor */
+ .sleb128 8 /* Data alignment factor */
+ .byte 61 /* Return address register column, iaoq[0] */
+ .uleb128 1 /* Augmentation value length */
+ .byte 0x1b /* DW_EH_PE_pcrel | DW_EH_PE_sdata4. */
+ .byte 0x0f /* DW_CFA_def_cfa_expresion */
+ .uleb128 9f - 1f /* length */
+1:
+ .byte 0x8e /* DW_OP_breg30 */
+ .sleb128 PTREGS
+9:
+ .balign 8
+.Lcie_end:
+
+ .long .Lfde0_end - .Lfde0_start
+.Lfde0_start:
+ .long .Lfde0_start - .Lcie /* CIE pointer. */
+ .long .Lsigrt_start - . /* PC start, length */
+ .long .Lsigrt_end - .Lsigrt_start
+ .uleb128 0 /* Augmentation */
+
+ /* General registers */
+ rsave 1, 2
+ rsave 2, 3
+ rsave 3, 4
+ rsave 4, 5
+ rsave 5, 6
+ rsave 6, 7
+ rsave 7, 8
+ rsave 8, 9
+ rsave 9, 10
+ rsave 10, 11
+ rsave 11, 12
+ rsave 12, 13
+ rsave 13, 14
+ rsave 14, 15
+ rsave 15, 16
+ rsave 16, 17
+ rsave 17, 18
+ rsave 18, 19
+ rsave 19, 20
+ rsave 20, 21
+ rsave 21, 22
+ rsave 22, 23
+ rsave 23, 24
+ rsave 24, 25
+ rsave 25, 26
+ rsave 26, 27
+ rsave 27, 28
+ rsave 28, 29
+ rsave 29, 30
+ rsave 30, 31
+ rsave 31, 32
+
+ /* Floating-point registers */
+ rsave 32, 36
+ rsave 33, 37
+ rsave 34, 38
+ rsave 35, 39
+ rsave 36, 40
+ rsave 37, 41
+ rsave 38, 42
+ rsave 39, 43
+ rsave 40, 44
+ rsave 41, 45
+ rsave 42, 46
+ rsave 43, 47
+ rsave 44, 48
+ rsave 45, 49
+ rsave 46, 50
+ rsave 47, 51
+ rsave 48, 52
+ rsave 49, 53
+ rsave 50, 54
+ rsave 51, 55
+ rsave 52, 56
+ rsave 53, 57
+ rsave 54, 58
+ rsave 55, 59
+ rsave 56, 60
+ rsave 57, 61
+ rsave 58, 62
+ rsave 59, 63
+
+ /* SAR register */
+ rsave 60, 67
+
+ /* iaoq[0] return address register */
+ rsave 61, 65
+ .balign 8
+.Lfde0_end:
diff --git a/arch/parisc/kernel/vdso64/vdso64.lds.S b/arch/parisc/kernel/vdso64/vdso64.lds.S
new file mode 100644
index 000000000..de1fb4b19
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/vdso64.lds.S
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This is the infamous ld script for the 64 bits vdso library
+ */
+#include <asm/vdso.h>
+
+/* Default link addresses for the vDSOs */
+OUTPUT_FORMAT("elf64-hppa-linux")
+OUTPUT_ARCH(hppa:hppa2.0w)
+ENTRY(_start)
+
+SECTIONS
+{
+ . = VDSO_LBASE + SIZEOF_HEADERS;
+ .hash : { *(.hash) } :text
+ .gnu.hash : { *(.gnu.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
+ .gnu.version_d : { *(.gnu.version_d) }
+ .gnu.version_r : { *(.gnu.version_r) }
+
+ .note : { *(.note.*) } :text :note
+
+ . = ALIGN (16);
+ .text :
+ {
+ *(.text .stub .text.* .gnu.linkonce.t.*)
+ }
+ PROVIDE (__etext = .);
+ PROVIDE (_etext = .);
+ PROVIDE (etext = .);
+
+ /* Other stuff is appended to the text segment: */
+ .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
+ .rodata1 : { *(.rodata1) }
+
+ .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
+ .eh_frame : { KEEP (*(.eh_frame)) } :text
+ .gcc_except_table : { *(.gcc_except_table) }
+ .fixup : { *(.fixup) }
+
+ .dynamic : { *(.dynamic) } :text :dynamic
+ .plt : { *(.plt) }
+ .got : { *(.got) }
+
+ _end = .;
+ __end = .;
+ PROVIDE (end = .);
+
+
+ /* Stabs debugging sections are here too
+ */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+
+ /DISCARD/ : { *(.note.GNU-stack) }
+ /DISCARD/ : { *(.data .data.* .gnu.linkonce.d.* .sdata*) }
+ /DISCARD/ : { *(.bss .sbss .dynbss .dynsbss) }
+}
+
+
+PHDRS
+{
+ text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+ note PT_NOTE FLAGS(4); /* PF_R */
+ dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+ eh_frame_hdr PT_GNU_EH_FRAME;
+}
+
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+ VDSO_VERSION_STRING {
+ global:
+ __kernel_sigtramp_rt64;
+ __kernel_restart_syscall64;
+ local: *;
+ };
+}
diff --git a/arch/parisc/kernel/vdso64/vdso64_wrapper.S b/arch/parisc/kernel/vdso64/vdso64_wrapper.S
new file mode 100644
index 000000000..66f929482
--- /dev/null
+++ b/arch/parisc/kernel/vdso64/vdso64_wrapper.S
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <linux/linkage.h>
+#include <asm/page.h>
+
+ __PAGE_ALIGNED_DATA
+
+ .globl vdso64_start, vdso64_end
+ .balign PAGE_SIZE
+vdso64_start:
+ .incbin "arch/parisc/kernel/vdso64/vdso64.so"
+ .balign PAGE_SIZE
+vdso64_end:
+
+ .previous