[PULL 6/6] linux-user/sh4: add VDSO support for sh4 and sh4eb

[Helge Deller <deller@kernel.org>]

From: Matt Turner <mattst88@gmail.com>

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>
---
 linux-user/sh4/Makefile.vdso    |  18 ++++
 linux-user/sh4/elfload.c        |  14 ++++
 linux-user/sh4/meson.build      |  12 +++
 linux-user/sh4/target_elf.h     |   1 +
 linux-user/sh4/vdso-asmoffset.h |  45 ++++++++++
 linux-user/sh4/vdso-be.so       | Bin 0 -> 2704 bytes
 linux-user/sh4/vdso-le.so       | Bin 0 -> 2704 bytes
 linux-user/sh4/vdso.S           | 142 ++++++++++++++++++++++++++++++++
 linux-user/sh4/vdso.ld          |  67 +++++++++++++++
 9 files changed, 299 insertions(+)
 create mode 100644 linux-user/sh4/Makefile.vdso
 create mode 100644 linux-user/sh4/vdso-asmoffset.h
 create mode 100755 linux-user/sh4/vdso-be.so
 create mode 100755 linux-user/sh4/vdso-le.so
 create mode 100644 linux-user/sh4/vdso.S
 create mode 100644 linux-user/sh4/vdso.ld

diff --git a/linux-user/sh4/Makefile.vdso b/linux-user/sh4/Makefile.vdso
new file mode 100644
index 0000000000..272c5d262d
--- /dev/null
+++ b/linux-user/sh4/Makefile.vdso
@@ -0,0 +1,18 @@
+include $(BUILD_DIR)/tests/tcg/sh4-linux-user/config-target.mak
+
+SUBDIR = $(SRC_PATH)/linux-user/sh4
+VPATH += $(SUBDIR)
+
+all: $(SUBDIR)/vdso-le.so $(SUBDIR)/vdso-be.so
+
+LDFLAGS = -nostdlib -shared -Wl,-h,linux-gate.so.1 \
+	  -Wl,--build-id=sha1 -Wl,--hash-style=both \
+	  -Wl,-T,$(SUBDIR)/vdso.ld
+
+$(SUBDIR)/vdso-le.so: vdso.S vdso.ld vdso-asmoffset.h
+	$(CC) -o $@ $(LDFLAGS) -ml $<
+
+CC_BE = sh4eb-unknown-linux-gnu-gcc
+
+$(SUBDIR)/vdso-be.so: vdso.S vdso.ld vdso-asmoffset.h
+	$(CC_BE) -o $@ $(LDFLAGS) $<
diff --git a/linux-user/sh4/elfload.c b/linux-user/sh4/elfload.c
index ddf2aaaed7..f03ce49e7d 100644
--- a/linux-user/sh4/elfload.c
+++ b/linux-user/sh4/elfload.c
@@ -5,6 +5,20 @@
 #include "loader.h"
 #include "target_elf.h"
 
+#if TARGET_BIG_ENDIAN
+# include "vdso-be.c.inc"
+#else
+# include "vdso-le.c.inc"
+#endif
+
+const VdsoImageInfo *get_vdso_image_info(uint32_t elf_flags G_GNUC_UNUSED)
+{
+#if TARGET_BIG_ENDIAN
+    return &vdso_be_image_info;
+#else
+    return &vdso_le_image_info;
+#endif
+}
 
 const char *get_elf_cpu_model(uint32_t eflags)
 {
diff --git a/linux-user/sh4/meson.build b/linux-user/sh4/meson.build
index 3bc3a6924a..611bce050b 100644
--- a/linux-user/sh4/meson.build
+++ b/linux-user/sh4/meson.build
@@ -3,3 +3,15 @@ syscall_nr_generators += {
                    arguments: [ meson.current_source_dir() / 'syscallhdr.sh', '@INPUT@', '@OUTPUT@', '@EXTRA_ARGS@' ],
                    output: '@BASENAME@_nr.h')
 }
+
+vdso_le_inc = gen_vdso.process('vdso-le.so',
+                               extra_args: ['-s', '__kernel_sigreturn',
+                                            '-r', '__kernel_rt_sigreturn',
+                                            '-p', 'vdso_le'])
+
+vdso_be_inc = gen_vdso.process('vdso-be.so',
+                               extra_args: ['-s', '__kernel_sigreturn',
+                                            '-r', '__kernel_rt_sigreturn',
+                                            '-p', 'vdso_be'])
+
+linux_user_ss.add(when: 'TARGET_SH4', if_true: [vdso_le_inc, vdso_be_inc])
diff --git a/linux-user/sh4/target_elf.h b/linux-user/sh4/target_elf.h
index d9e253d425..3fcb63d409 100644
--- a/linux-user/sh4/target_elf.h
+++ b/linux-user/sh4/target_elf.h
@@ -15,6 +15,7 @@
 
 #define HAVE_ELF_HWCAP          1
 #define HAVE_ELF_CORE_DUMP      1
+#define HAVE_VDSO_IMAGE_INFO    1
 
 /*
  * See linux kernel: arch/sh/include/asm/elf.h, where
diff --git a/linux-user/sh4/vdso-asmoffset.h b/linux-user/sh4/vdso-asmoffset.h
new file mode 100644
index 0000000000..8ca96dce16
--- /dev/null
+++ b/linux-user/sh4/vdso-asmoffset.h
@@ -0,0 +1,45 @@
+/*
+ * Offsets into target signal frames for sh4 vdso.
+ *
+ * From linux-user/sh4/signal.c:
+ *
+ * struct target_sigcontext {
+ *     target_ulong oldmask;           //   0
+ *     target_ulong sc_gregs[16];      //   4
+ *     target_ulong sc_pc;             //  68
+ *     target_ulong sc_pr;             //  72
+ *     target_ulong sc_sr;             //  76
+ *     target_ulong sc_gbr;            //  80
+ *     target_ulong sc_mach;           //  84
+ *     target_ulong sc_macl;           //  88
+ *     target_ulong sc_fpregs[16];     //  92
+ *     target_ulong sc_xfpregs[16];    // 156
+ *     unsigned int sc_fpscr;          // 220
+ *     unsigned int sc_fpul;           // 224
+ *     unsigned int sc_ownedfp;        // 228
+ * };                                  // sizeof = 232
+ *
+ * struct sigframe    { sigcontext sc; ... }
+ * struct rt_sigframe { siginfo info[128]; ucontext uc; }
+ *   ucontext = { flags[4], link[4], stack[12], sigcontext mcontext; ... }
+ *   => mcontext at rt_sigframe + 128 + 20 = rt_sigframe + 148
+ */
+
+/* Offset of sigcontext within sigframe (CFA base for sigreturn). */
+#define SIGFRAME_SC_OFFSET      0
+
+/* Offset of tuc_mcontext within rt_sigframe (CFA base for rt_sigreturn). */
+#define RT_SIGFRAME_SC_OFFSET   148
+
+/* Offsets within struct sigcontext. */
+#define SC_GREGS    4
+#define SC_PC       68
+#define SC_PR       72
+#define SC_SR       76
+#define SC_GBR      80
+#define SC_MACH     84
+#define SC_MACL     88
+#define SC_FPREGS   92
+#define SC_XFPREGS  156
+#define SC_FPSCR    220
+#define SC_FPUL     224
diff --git a/linux-user/sh4/vdso-be.so b/linux-user/sh4/vdso-be.so
new file mode 100755
index 0000000000000000000000000000000000000000..4f50143f8284ab63693c1117e68f3efa886155e3
GIT binary patch
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diff --git a/linux-user/sh4/vdso-le.so b/linux-user/sh4/vdso-le.so
new file mode 100755
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/linux-user/sh4/vdso.S b/linux-user/sh4/vdso.S
new file mode 100644
index 0000000000..4fb5ee9d31
--- /dev/null
+++ b/linux-user/sh4/vdso.S
@@ -0,0 +1,142 @@
+/*
+ * sh4 linux replacement vdso.
+ *
+ * Copyright 2023 Linaro, Ltd.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <asm/unistd.h>
+#include "vdso-asmoffset.h"
+
+	.text
+
+.macro endf name
+	.globl	\name
+	.type	\name, @function
+	.size	\name, . - \name
+.endm
+
+/*
+ * SH4 syscall convention:
+ *   Syscall number in r3 (caller-saved, so no save/restore needed)
+ *   Arguments in r4-r7
+ *   Return value in r0
+ *   Syscall instruction: trapa #0x10
+ */
+
+.macro vdso_syscall name, nr
+\name:
+	.cfi_startproc
+	mov.l	1f, r3
+	trapa	#0x10
+	rts
+	nop
+	.align	2
+1:	.long	\nr
+	.cfi_endproc
+endf \name
+.endm
+
+vdso_syscall __vdso_clock_gettime, __NR_clock_gettime
+vdso_syscall __vdso_clock_gettime64, __NR_clock_gettime64
+vdso_syscall __vdso_clock_getres, __NR_clock_getres
+vdso_syscall __vdso_gettimeofday, __NR_gettimeofday
+
+/*
+ * Signal return trampolines.
+ *
+ * For sigreturn: r15 points to struct sigframe; sigcontext is at
+ *   offset SIGFRAME_SC_OFFSET (0).
+ * For rt_sigreturn: r15 points to struct rt_sigframe; sigcontext is at
+ *   offset RT_SIGFRAME_SC_OFFSET (148).
+ *
+ * A single CFI region covers both trampolines.  The CFA is set to the
+ * start of the relevant sigcontext; all register offsets are then
+ * identical for both trampolines.  Between the two trampolines we use
+ * .cfi_def_cfa_offset to update the CFA base for the different layout.
+ */
+
+/*
+ * Start the unwind info at least one instruction before the signal
+ * trampoline, because the unwinder will assume we are returning
+ * after a call site.
+ */
+	.cfi_startproc simple
+	.cfi_signal_frame
+	.cfi_return_column 16		/* return column is PC */
+
+	/* CFA = r15 + SIGFRAME_SC_OFFSET = r15 (sigcontext base, sigreturn). */
+	.cfi_def_cfa		15, SIGFRAME_SC_OFFSET
+
+	/* Integer registers r0-r15: sc_gregs[n] at sigcontext + SC_GREGS + n*4. */
+	.cfi_offset		0,  SC_GREGS + 0  * 4
+	.cfi_offset		1,  SC_GREGS + 1  * 4
+	.cfi_offset		2,  SC_GREGS + 2  * 4
+	.cfi_offset		3,  SC_GREGS + 3  * 4
+	.cfi_offset		4,  SC_GREGS + 4  * 4
+	.cfi_offset		5,  SC_GREGS + 5  * 4
+	.cfi_offset		6,  SC_GREGS + 6  * 4
+	.cfi_offset		7,  SC_GREGS + 7  * 4
+	.cfi_offset		8,  SC_GREGS + 8  * 4
+	.cfi_offset		9,  SC_GREGS + 9  * 4
+	.cfi_offset		10, SC_GREGS + 10 * 4
+	.cfi_offset		11, SC_GREGS + 11 * 4
+	.cfi_offset		12, SC_GREGS + 12 * 4
+	.cfi_offset		13, SC_GREGS + 13 * 4
+	.cfi_offset		14, SC_GREGS + 14 * 4
+	.cfi_offset		15, SC_GREGS + 15 * 4
+
+	/* PC (return column). */
+	.cfi_offset		16, SC_PC
+
+	/* Control registers. */
+	.cfi_offset		17, SC_PR
+	.cfi_offset		18, SC_GBR
+	.cfi_offset		20, SC_MACH
+	.cfi_offset		21, SC_MACL
+
+	/* FP registers fr0-fr15: sc_fpregs[n] at sigcontext + SC_FPREGS + n*4. */
+	.cfi_offset		25, SC_FPREGS + 0  * 4
+	.cfi_offset		26, SC_FPREGS + 1  * 4
+	.cfi_offset		27, SC_FPREGS + 2  * 4
+	.cfi_offset		28, SC_FPREGS + 3  * 4
+	.cfi_offset		29, SC_FPREGS + 4  * 4
+	.cfi_offset		30, SC_FPREGS + 5  * 4
+	.cfi_offset		31, SC_FPREGS + 6  * 4
+	.cfi_offset		32, SC_FPREGS + 7  * 4
+	.cfi_offset		33, SC_FPREGS + 8  * 4
+	.cfi_offset		34, SC_FPREGS + 9  * 4
+	.cfi_offset		35, SC_FPREGS + 10 * 4
+	.cfi_offset		36, SC_FPREGS + 11 * 4
+	.cfi_offset		37, SC_FPREGS + 12 * 4
+	.cfi_offset		38, SC_FPREGS + 13 * 4
+	.cfi_offset		39, SC_FPREGS + 14 * 4
+	.cfi_offset		40, SC_FPREGS + 15 * 4
+
+	/* FPUL, FPSCR. */
+	.cfi_offset		23, SC_FPUL
+	.cfi_offset		24, SC_FPSCR
+
+	nop
+
+sigreturn_region_start:
+__kernel_sigreturn:
+	mov.l	1f, r3
+	trapa	#0x10
+	.align	2
+1:	.long	__NR_sigreturn
+endf __kernel_sigreturn
+
+	/* Update CFA base for the rt_sigreturn frame layout. */
+	.cfi_def_cfa_offset	RT_SIGFRAME_SC_OFFSET
+
+__kernel_rt_sigreturn:
+	mov.l	2f, r3
+	trapa	#0x10
+	.align	2
+2:	.long	__NR_rt_sigreturn
+endf __kernel_rt_sigreturn
+sigreturn_region_end:
+
+	.cfi_endproc
diff --git a/linux-user/sh4/vdso.ld b/linux-user/sh4/vdso.ld
new file mode 100644
index 0000000000..3a6cb65d08
--- /dev/null
+++ b/linux-user/sh4/vdso.ld
@@ -0,0 +1,67 @@
+/*
+ * Linker script for linux sh4 replacement vdso.
+ *
+ * Copyright 2023 Linaro, Ltd.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+VERSION {
+	LINUX_2.6 {
+	global:
+		__vdso_clock_gettime;
+		__vdso_clock_gettime64;
+		__vdso_clock_getres;
+		__vdso_gettimeofday;
+		__kernel_sigreturn;
+		__kernel_rt_sigreturn;
+	local: *;
+	};
+}
+
+PHDRS {
+	phdr		PT_PHDR		FLAGS(4) PHDRS;
+	load		PT_LOAD		FLAGS(7) FILEHDR PHDRS; /* FLAGS=RWX */
+	dynamic		PT_DYNAMIC	FLAGS(4);
+	eh_frame_hdr	PT_GNU_EH_FRAME;
+	note		PT_NOTE		FLAGS(4);
+}
+
+SECTIONS {
+	. = SIZEOF_HEADERS;
+
+	/*
+	 * The following, including the FILEHDRS and PHDRS, are modified
+	 * when we relocate the binary.  We want them to be initially
+	 * writable for the relocation; we'll force them read-only after.
+	 */
+	.note		: { *(.note*) }		:load :note
+	.dynamic	: { *(.dynamic) }	:load :dynamic
+	.dynsym		: { *(.dynsym) }	:load
+	.data		: {
+		/*
+		 * There ought not be any real read-write data.
+		 * But since we manipulated the segment layout,
+		 * we have to put these sections somewhere.
+		 */
+		*(.data*)
+		*(.sdata*)
+		*(.got.plt) *(.got)
+		*(.gnu.linkonce.d.*)
+		*(.bss*)
+		*(.dynbss*)
+		*(.gnu.linkonce.b.*)
+	}
+
+	.rodata		: { *(.rodata*) }
+	.hash		: { *(.hash) }
+	.gnu.hash	: { *(.gnu.hash) }
+	.dynstr		: { *(.dynstr) }
+	.gnu.version	: { *(.gnu.version) }
+	.gnu.version_d	: { *(.gnu.version_d) }
+	.gnu.version_r	: { *(.gnu.version_r) }
+	.eh_frame_hdr	: { *(.eh_frame_hdr) }	:load :eh_frame_hdr
+	.eh_frame	: { *(.eh_frame) }	:load
+
+	.text		: { *(.text*) }		:load
+}
-- 
2.54.0