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linux-user/sh4: add VDSO support for sh4 and sh4eb
Provides replacement VDSO with sigreturn trampolines (__kernel_sigreturn, __kernel_rt_sigreturn) and syscall stubs (clock_gettime, clock_gettime64, clock_getres, gettimeofday). Both LE and BE blobs are committed and selected at compile time via TARGET_BIG_ENDIAN. The BE variant requires an sh4eb-unknown-linux-gnu toolchain; sh4-unknown-linux-gnu does not support -mb. CFI register numbers follow GCC's SH_DEBUGGER_REGNO: PR=17, GBR=18, MACH=20, MACL=21, FPUL=23, FPSCR=24, FR0-15=25-40. Signed-off-by: Matt Turner <mattst88@gmail.com> Signed-off-by: Helge Deller <deller@gmx.de>
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Matt Turner authored and Helge Deller committed
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@@ -0,0 +1,18 @@
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include $(BUILD_DIR)/tests/tcg/sh4-linux-user/config-target.mak
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SUBDIR = $(SRC_PATH)/linux-user/sh4
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VPATH += $(SUBDIR)
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all: $(SUBDIR)/vdso-le.so $(SUBDIR)/vdso-be.so
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LDFLAGS = -nostdlib -shared -Wl,-h,linux-gate.so.1 \
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-Wl,--build-id=sha1 -Wl,--hash-style=both \
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-Wl,-T,$(SUBDIR)/vdso.ld
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$(SUBDIR)/vdso-le.so: vdso.S vdso.ld vdso-asmoffset.h
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$(CC) -o $@ $(LDFLAGS) -ml $<
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CC_BE = sh4eb-unknown-linux-gnu-gcc
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$(SUBDIR)/vdso-be.so: vdso.S vdso.ld vdso-asmoffset.h
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$(CC_BE) -o $@ $(LDFLAGS) $<
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@@ -5,6 +5,20 @@
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#include "loader.h"
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#include "target_elf.h"
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#if TARGET_BIG_ENDIAN
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# include "vdso-be.c.inc"
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#else
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# include "vdso-le.c.inc"
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#endif
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const VdsoImageInfo *get_vdso_image_info(uint32_t elf_flags G_GNUC_UNUSED)
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{
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#if TARGET_BIG_ENDIAN
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return &vdso_be_image_info;
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#else
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return &vdso_le_image_info;
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#endif
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}
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const char *get_elf_cpu_model(uint32_t eflags)
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{
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@@ -3,3 +3,15 @@ syscall_nr_generators += {
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arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ],
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output: '@BASENAME@_nr.h')
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}
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vdso_le_inc = gen_vdso.process('vdso-le.so',
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extra_args: ['-s', '__kernel_sigreturn',
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'-r', '__kernel_rt_sigreturn',
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'-p', 'vdso_le'])
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vdso_be_inc = gen_vdso.process('vdso-be.so',
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extra_args: ['-s', '__kernel_sigreturn',
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'-r', '__kernel_rt_sigreturn',
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'-p', 'vdso_be'])
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linux_user_ss.add(when: 'TARGET_SH4', if_true: [vdso_le_inc, vdso_be_inc])
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@@ -15,6 +15,7 @@
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#define HAVE_ELF_HWCAP 1
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#define HAVE_ELF_CORE_DUMP 1
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#define HAVE_VDSO_IMAGE_INFO 1
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/*
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* See linux kernel: arch/sh/include/asm/elf.h, where
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@@ -0,0 +1,45 @@
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/*
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* Offsets into target signal frames for sh4 vdso.
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*
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* From linux-user/sh4/signal.c:
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*
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* struct target_sigcontext {
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* target_ulong oldmask; // 0
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* target_ulong sc_gregs[16]; // 4
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* target_ulong sc_pc; // 68
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* target_ulong sc_pr; // 72
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* target_ulong sc_sr; // 76
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* target_ulong sc_gbr; // 80
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* target_ulong sc_mach; // 84
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* target_ulong sc_macl; // 88
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* target_ulong sc_fpregs[16]; // 92
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* target_ulong sc_xfpregs[16]; // 156
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* unsigned int sc_fpscr; // 220
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* unsigned int sc_fpul; // 224
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* unsigned int sc_ownedfp; // 228
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* }; // sizeof = 232
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*
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* struct sigframe { sigcontext sc; ... }
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* struct rt_sigframe { siginfo info[128]; ucontext uc; }
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* ucontext = { flags[4], link[4], stack[12], sigcontext mcontext; ... }
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* => mcontext at rt_sigframe + 128 + 20 = rt_sigframe + 148
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*/
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/* Offset of sigcontext within sigframe (CFA base for sigreturn). */
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#define SIGFRAME_SC_OFFSET 0
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/* Offset of tuc_mcontext within rt_sigframe (CFA base for rt_sigreturn). */
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#define RT_SIGFRAME_SC_OFFSET 148
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/* Offsets within struct sigcontext. */
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#define SC_GREGS 4
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#define SC_PC 68
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#define SC_PR 72
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#define SC_SR 76
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#define SC_GBR 80
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#define SC_MACH 84
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#define SC_MACL 88
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#define SC_FPREGS 92
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#define SC_XFPREGS 156
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#define SC_FPSCR 220
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#define SC_FPUL 224
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Executable
BIN
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Executable
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@@ -0,0 +1,142 @@
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/*
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* sh4 linux replacement vdso.
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*
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* Copyright 2023 Linaro, Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include <asm/unistd.h>
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#include "vdso-asmoffset.h"
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.text
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.macro endf name
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.globl \name
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.type \name, @function
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.size \name, . - \name
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.endm
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/*
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* SH4 syscall convention:
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* Syscall number in r3 (caller-saved, so no save/restore needed)
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* Arguments in r4-r7
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* Return value in r0
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* Syscall instruction: trapa #0x10
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*/
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.macro vdso_syscall name, nr
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\name:
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.cfi_startproc
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mov.l 1f, r3
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trapa #0x10
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rts
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nop
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.align 2
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1: .long \nr
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.cfi_endproc
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endf \name
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.endm
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vdso_syscall __vdso_clock_gettime, __NR_clock_gettime
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vdso_syscall __vdso_clock_gettime64, __NR_clock_gettime64
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vdso_syscall __vdso_clock_getres, __NR_clock_getres
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vdso_syscall __vdso_gettimeofday, __NR_gettimeofday
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/*
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* Signal return trampolines.
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*
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* For sigreturn: r15 points to struct sigframe; sigcontext is at
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* offset SIGFRAME_SC_OFFSET (0).
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* For rt_sigreturn: r15 points to struct rt_sigframe; sigcontext is at
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* offset RT_SIGFRAME_SC_OFFSET (148).
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*
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* A single CFI region covers both trampolines. The CFA is set to the
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* start of the relevant sigcontext; all register offsets are then
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* identical for both trampolines. Between the two trampolines we use
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* .cfi_def_cfa_offset to update the CFA base for the different layout.
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*/
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/*
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* Start the unwind info at least one instruction before the signal
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* trampoline, because the unwinder will assume we are returning
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* after a call site.
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*/
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.cfi_startproc simple
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.cfi_signal_frame
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.cfi_return_column 16 /* return column is PC */
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/* CFA = r15 + SIGFRAME_SC_OFFSET = r15 (sigcontext base, sigreturn). */
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.cfi_def_cfa 15, SIGFRAME_SC_OFFSET
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/* Integer registers r0-r15: sc_gregs[n] at sigcontext + SC_GREGS + n*4. */
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.cfi_offset 0, SC_GREGS + 0 * 4
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.cfi_offset 1, SC_GREGS + 1 * 4
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.cfi_offset 2, SC_GREGS + 2 * 4
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.cfi_offset 3, SC_GREGS + 3 * 4
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.cfi_offset 4, SC_GREGS + 4 * 4
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.cfi_offset 5, SC_GREGS + 5 * 4
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.cfi_offset 6, SC_GREGS + 6 * 4
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.cfi_offset 7, SC_GREGS + 7 * 4
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.cfi_offset 8, SC_GREGS + 8 * 4
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.cfi_offset 9, SC_GREGS + 9 * 4
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.cfi_offset 10, SC_GREGS + 10 * 4
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.cfi_offset 11, SC_GREGS + 11 * 4
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.cfi_offset 12, SC_GREGS + 12 * 4
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.cfi_offset 13, SC_GREGS + 13 * 4
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.cfi_offset 14, SC_GREGS + 14 * 4
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.cfi_offset 15, SC_GREGS + 15 * 4
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/* PC (return column). */
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.cfi_offset 16, SC_PC
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/* Control registers. */
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.cfi_offset 17, SC_PR
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.cfi_offset 18, SC_GBR
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.cfi_offset 20, SC_MACH
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.cfi_offset 21, SC_MACL
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/* FP registers fr0-fr15: sc_fpregs[n] at sigcontext + SC_FPREGS + n*4. */
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.cfi_offset 25, SC_FPREGS + 0 * 4
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.cfi_offset 26, SC_FPREGS + 1 * 4
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.cfi_offset 27, SC_FPREGS + 2 * 4
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.cfi_offset 28, SC_FPREGS + 3 * 4
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.cfi_offset 29, SC_FPREGS + 4 * 4
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.cfi_offset 30, SC_FPREGS + 5 * 4
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.cfi_offset 31, SC_FPREGS + 6 * 4
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.cfi_offset 32, SC_FPREGS + 7 * 4
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.cfi_offset 33, SC_FPREGS + 8 * 4
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.cfi_offset 34, SC_FPREGS + 9 * 4
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.cfi_offset 35, SC_FPREGS + 10 * 4
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.cfi_offset 36, SC_FPREGS + 11 * 4
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.cfi_offset 37, SC_FPREGS + 12 * 4
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.cfi_offset 38, SC_FPREGS + 13 * 4
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.cfi_offset 39, SC_FPREGS + 14 * 4
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.cfi_offset 40, SC_FPREGS + 15 * 4
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/* FPUL, FPSCR. */
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.cfi_offset 23, SC_FPUL
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.cfi_offset 24, SC_FPSCR
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nop
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sigreturn_region_start:
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__kernel_sigreturn:
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mov.l 1f, r3
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trapa #0x10
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.align 2
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1: .long __NR_sigreturn
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endf __kernel_sigreturn
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/* Update CFA base for the rt_sigreturn frame layout. */
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.cfi_def_cfa_offset RT_SIGFRAME_SC_OFFSET
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__kernel_rt_sigreturn:
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mov.l 2f, r3
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trapa #0x10
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.align 2
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2: .long __NR_rt_sigreturn
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endf __kernel_rt_sigreturn
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sigreturn_region_end:
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.cfi_endproc
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@@ -0,0 +1,67 @@
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/*
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* Linker script for linux sh4 replacement vdso.
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*
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* Copyright 2023 Linaro, Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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VERSION {
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LINUX_2.6 {
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global:
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__vdso_clock_gettime;
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__vdso_clock_gettime64;
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__vdso_clock_getres;
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__vdso_gettimeofday;
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__kernel_sigreturn;
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__kernel_rt_sigreturn;
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local: *;
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};
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}
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PHDRS {
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phdr PT_PHDR FLAGS(4) PHDRS;
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load PT_LOAD FLAGS(7) FILEHDR PHDRS; /* FLAGS=RWX */
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dynamic PT_DYNAMIC FLAGS(4);
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eh_frame_hdr PT_GNU_EH_FRAME;
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note PT_NOTE FLAGS(4);
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}
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SECTIONS {
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. = SIZEOF_HEADERS;
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/*
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* The following, including the FILEHDRS and PHDRS, are modified
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* when we relocate the binary. We want them to be initially
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* writable for the relocation; we'll force them read-only after.
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*/
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.note : { *(.note*) } :load :note
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.dynamic : { *(.dynamic) } :load :dynamic
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.dynsym : { *(.dynsym) } :load
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.data : {
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/*
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* There ought not be any real read-write data.
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* But since we manipulated the segment layout,
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* we have to put these sections somewhere.
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*/
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*(.data*)
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*(.sdata*)
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*(.got.plt) *(.got)
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*(.gnu.linkonce.d.*)
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*(.bss*)
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*(.dynbss*)
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*(.gnu.linkonce.b.*)
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}
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.rodata : { *(.rodata*) }
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.hash : { *(.hash) }
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.gnu.hash : { *(.gnu.hash) }
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.dynstr : { *(.dynstr) }
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.gnu.version : { *(.gnu.version) }
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.gnu.version_d : { *(.gnu.version_d) }
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.gnu.version_r : { *(.gnu.version_r) }
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.eh_frame_hdr : { *(.eh_frame_hdr) } :load :eh_frame_hdr
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.eh_frame : { *(.eh_frame) } :load
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.text : { *(.text*) } :load
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}
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