Building the vdso itself is not actually wired up to anything, since
we require a cross-compiler. Just check in those files for now.
This fixes a bug wrt libgcc fallback unwinding. It expects the stack
pointer to point to the siginfo_t, whereas we had inexplicably placed
our private signal trampoline at the start of the signal frame instead
of the end. Now moot because we have removed it from the stack
frame entirely.
Cc: qemu-ri...@nongnu.org
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
linux-user/elfload.c | 4 +
linux-user/riscv/signal.c | 10 +-
linux-user/meson.build | 1 +
linux-user/riscv/Makefile.vdso | 11 ++
linux-user/riscv/meson.build | 9 ++
linux-user/riscv/vdso-32.so | Bin 0 -> 5624 bytes
linux-user/riscv/vdso-64.so | Bin 0 -> 6120 bytes
linux-user/riscv/vdso.S | 207 +++++++++++++++++++++++++++++++++
linux-user/riscv/vdso.ld | 76 ++++++++++++
9 files changed, 309 insertions(+), 9 deletions(-)
create mode 100644 linux-user/riscv/Makefile.vdso
create mode 100644 linux-user/riscv/meson.build
create mode 100755 linux-user/riscv/vdso-32.so
create mode 100755 linux-user/riscv/vdso-64.so
create mode 100644 linux-user/riscv/vdso.S
create mode 100644 linux-user/riscv/vdso.ld
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 43c985f318..782d2904bc 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -1484,10 +1484,14 @@ static void elf_core_copy_regs(target_elf_gregset_t
*regs,
#ifdef TARGET_RISCV32
#define ELF_CLASS ELFCLASS32
+#include "vdso-32.c.inc"
#else
#define ELF_CLASS ELFCLASS64
+#include "vdso-64.c.inc"
#endif
+#define vdso_image_info() &vdso_image_info
+
static inline void init_thread(struct target_pt_regs *regs,
struct image_info *infop)
{
diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c
index 9405c7fd9a..fe7cf7723b 100644
--- a/linux-user/riscv/signal.c
+++ b/linux-user/riscv/signal.c
@@ -46,7 +46,6 @@ struct target_ucontext {
};
struct target_rt_sigframe {
- uint32_t tramp[2]; /* not in kernel, which uses VDSO instead */
struct target_siginfo info;
struct target_ucontext uc;
};
@@ -104,12 +103,6 @@ static void setup_ucontext(struct target_ucontext *uc,
setup_sigcontext(&uc->uc_mcontext, env);
}
-static inline void install_sigtramp(uint32_t *tramp)
-{
- __put_user(0x08b00893, tramp + 0); /* li a7, 139 = __NR_rt_sigreturn */
- __put_user(0x00000073, tramp + 1); /* ecall */
-}
-
void setup_rt_frame(int sig, struct target_sigaction *ka,
target_siginfo_t *info,
target_sigset_t *set, CPURISCVState *env)
@@ -126,14 +119,13 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
setup_ucontext(&frame->uc, env, set);
tswap_siginfo(&frame->info, info);
- install_sigtramp(frame->tramp);
env->pc = ka->_sa_handler;
env->gpr[xSP] = frame_addr;
env->gpr[xA0] = sig;
env->gpr[xA1] = frame_addr + offsetof(struct target_rt_sigframe, info);
env->gpr[xA2] = frame_addr + offsetof(struct target_rt_sigframe, uc);
- env->gpr[xRA] = frame_addr + offsetof(struct target_rt_sigframe, tramp);
+ env->gpr[xRA] = default_rt_sigreturn;
return;
diff --git a/linux-user/meson.build b/linux-user/meson.build
index 8021044053..e581d5ceba 100644
--- a/linux-user/meson.build
+++ b/linux-user/meson.build
@@ -35,6 +35,7 @@ subdir('microblaze')
subdir('mips64')
subdir('mips')
subdir('ppc')
+subdir('riscv')
subdir('s390x')
subdir('sh4')
subdir('sparc')
diff --git a/linux-user/riscv/Makefile.vdso b/linux-user/riscv/Makefile.vdso
new file mode 100644
index 0000000000..de55a0b9f9
--- /dev/null
+++ b/linux-user/riscv/Makefile.vdso
@@ -0,0 +1,11 @@
+CROSS_CC ?= riscv64-linux-gnu-gcc
+LDFLAGS := -nostdlib -shared -Wl,-T,vdso.ld \
+ -Wl,-h,linux-vdso.so.1 -Wl,--hash-style=both -Wl,--build-id=sha1
+
+all: vdso-64.so vdso-32.so
+
+vdso-64.so: vdso.S vdso.ld Makefile.vdso
+ $(CROSS_CC) $(LDFLAGS) -mabi=lp64d -march=rv64g -fpic -o $@ vdso.S
+
+vdso-32.so: vdso.S vdso.ld Makefile.vdso
+ $(CROSS_CC) $(LDFLAGS) -mabi=ilp32d -march=rv32g -fpic -o $@ vdso.S
diff --git a/linux-user/riscv/meson.build b/linux-user/riscv/meson.build
new file mode 100644
index 0000000000..475b816da1
--- /dev/null
+++ b/linux-user/riscv/meson.build
@@ -0,0 +1,9 @@
+gen32 = [
+ gen_vdso.process('vdso-32.so', extra_args: ['-r', '__vdso_rt_sigreturn']),
+]
+gen64 = [
+ gen_vdso.process('vdso-64.so', extra_args: ['-r', '__vdso_rt_sigreturn'])
+]
+
+linux_user_ss.add(when: 'TARGET_RISCV32', if_true: gen32)
+linux_user_ss.add(when: 'TARGET_RISCV64', if_true: gen64)
diff --git a/linux-user/riscv/vdso-32.so b/linux-user/riscv/vdso-32.so
new file mode 100755
index
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HcmV?d00001
diff --git a/linux-user/riscv/vdso-64.so b/linux-user/riscv/vdso-64.so
new file mode 100755
index
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GIT binary patch
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diff --git a/linux-user/riscv/vdso.S b/linux-user/riscv/vdso.S
new file mode 100644
index 0000000000..31913e72cc
--- /dev/null
+++ b/linux-user/riscv/vdso.S
@@ -0,0 +1,207 @@
+/*
+ * RISC-V linux replacement vdso.
+ *
+ * Copyright 2021 Linaro, Ltd.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include <asm/unistd.h>
+#include <asm/errno.h>
+
+.macro syscall nr
+ li a7, \nr
+ ecall
+.endm
+
+ .text
+ .balign 16
+__vdso_gettimeofday:
+ .cfi_startproc
+#ifdef __NR_gettimeofday
+ syscall __NR_gettimeofday
+ ret
+#else
+ /* No gettimeofday, fall back to clock_gettime64. */
+ beq a1, zero, 1f
+ sw zero, 0(a1) /* tz->tz_minuteswest = 0 */
+ sw zero, 4(a1) /* tz->tz_dsttime = 0 */
+1: addi sp, sp, -32
+ .cfi_adjust_cfa_offset 32
+ sw a0, 16(sp) /* save tv */
+ mv a0, sp
+ syscall __NR_clock_gettime64
+ lw t0, 0(sp) /* timespec.tv_sec.low */
+ lw t1, 4(sp) /* timespec.tv_sec.high */
+ lw t2, 8(sp) /* timespec.tv_nsec.low */
+ lw a1, 16(sp) /* restore tv */
+ addi sp, sp, 32
+ .cfi_adjust_cfa_offset -32
+ bne a0, zero, 9f /* syscall error? */
+ li a0, -EOVERFLOW
+ bne t1, zero, 9f /* y2038? */
+ li a0, 0
+ li t3, 1000
+ divu t2, t2, t3 /* nsec -> usec */
+ sw t0, 0(a1) /* tz->tv_sec */
+ sw t2, 4(a1) /* tz->tv_usec */
+9: ret
+#endif
+ .cfi_endproc
+
+ .globl __vdso_gettimeofday
+ .type __vdso_gettimeofday, %function
+ .size __vdso_gettimeofday, . - __vdso_gettimeofday
+
+ .balign 16
+__vdso_clock_gettime:
+ .cfi_startproc
+#ifdef __NR_clock_gettime
+ syscall __NR_clock_gettime
+#else
+ syscall __NR_clock_gettime64
+#endif
+ ret
+ .cfi_endproc
+
+ .globl __vdso_clock_gettime
+ .type __vdso_clock_gettime, %function
+ .size __vdso_clock_gettime, . - __vdso_clock_gettime
+
+ .balign 16
+__vdso_clock_getres:
+ .cfi_startproc
+#ifdef __NR_clock_getres
+ syscall __NR_clock_getres
+#else
+ syscall __NR_clock_getres_time64
+#endif
+ ret
+ .cfi_endproc
+
+ .globl __vdso_clock_getres
+ .type __vdso_clock_getres, %function
+ .size __vdso_clock_getres, . - __vdso_clock_getres
+
+ .balign 16
+__vdso_getcpu:
+ .cfi_startproc
+ syscall __NR_getcpu
+ ret
+ .cfi_endproc
+
+ .globl __vdso_getcpu
+ .type __vdso_getcpu, %function
+ .size __vdso_getcpu, . - __vdso_getcpu
+
+ .balign 16
+__vdso_flush_icache:
+ .cfi_startproc
+ /* qemu does not need to flush the icache */
+ li a0, 0
+ ret
+ .cfi_endproc
+
+ .globl __vdso_flush_icache
+ .type __vdso_flush_icache, %function
+ .size __vdso_flush_icache, . - __vdso_flush_icache
+
+/*
+ * 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
+
+#if __riscv_xlen == 32
+# define offsetof_uc_mcontext 0x120
+#else
+# define offsetof_uc_mcontext 0x130
+#endif
+#define sizeof_reg (__riscv_xlen / 4)
+#define sizeof_freg 8
+#define offsetof_freg0 (sizeof_reg * 32)
+
+ .cfi_def_cfa 2, offsetof_uc_mcontext
+
+ /* Return address */
+ .cfi_return_column 64
+ .cfi_offset 64, 0 /* pc */
+
+ /* Integer registers */
+ .cfi_offset 1, 1 * sizeof_reg /* r1 (ra) */
+ .cfi_offset 2, 2 * sizeof_reg /* r2 (sp) */
+ .cfi_offset 3, 3 * sizeof_reg
+ .cfi_offset 4, 4 * sizeof_reg
+ .cfi_offset 5, 5 * sizeof_reg
+ .cfi_offset 6, 6 * sizeof_reg
+ .cfi_offset 7, 7 * sizeof_reg
+ .cfi_offset 8, sizeof_reg * 8
+ .cfi_offset 9, 9 * sizeof_reg
+ .cfi_offset 10, 10 * sizeof_reg
+ .cfi_offset 11, 11 * sizeof_reg
+ .cfi_offset 12, 12 * sizeof_reg
+ .cfi_offset 13, 13 * sizeof_reg
+ .cfi_offset 14, 14 * sizeof_reg
+ .cfi_offset 15, 15 * sizeof_reg
+ .cfi_offset 16, 16 * sizeof_reg
+ .cfi_offset 17, 17 * sizeof_reg
+ .cfi_offset 18, 18 * sizeof_reg
+ .cfi_offset 19, 19 * sizeof_reg
+ .cfi_offset 20, 20 * sizeof_reg
+ .cfi_offset 21, 21 * sizeof_reg
+ .cfi_offset 22, 22 * sizeof_reg
+ .cfi_offset 23, 23 * sizeof_reg
+ .cfi_offset 24, 24 * sizeof_reg
+ .cfi_offset 25, 25 * sizeof_reg
+ .cfi_offset 26, 26 * sizeof_reg
+ .cfi_offset 27, 27 * sizeof_reg
+ .cfi_offset 28, 28 * sizeof_reg
+ .cfi_offset 29, 29 * sizeof_reg
+ .cfi_offset 30, 30 * sizeof_reg
+ .cfi_offset 31, 31 * sizeof_reg /* r31 */
+
+ .cfi_offset 32, offsetof_freg0 /* f0 */
+ .cfi_offset 33, offsetof_freg0 + 1 * sizeof_freg /* f1 */
+ .cfi_offset 34, offsetof_freg0 + 2 * sizeof_freg
+ .cfi_offset 35, offsetof_freg0 + 3 * sizeof_freg
+ .cfi_offset 36, offsetof_freg0 + 4 * sizeof_freg
+ .cfi_offset 37, offsetof_freg0 + 5 * sizeof_freg
+ .cfi_offset 38, offsetof_freg0 + 6 * sizeof_freg
+ .cfi_offset 39, offsetof_freg0 + 7 * sizeof_freg
+ .cfi_offset 40, offsetof_freg0 + 8 * sizeof_freg
+ .cfi_offset 41, offsetof_freg0 + 9 * sizeof_freg
+ .cfi_offset 42, offsetof_freg0 + 10 * sizeof_freg
+ .cfi_offset 43, offsetof_freg0 + 11 * sizeof_freg
+ .cfi_offset 44, offsetof_freg0 + 12 * sizeof_freg
+ .cfi_offset 45, offsetof_freg0 + 13 * sizeof_freg
+ .cfi_offset 46, offsetof_freg0 + 14 * sizeof_freg
+ .cfi_offset 47, offsetof_freg0 + 15 * sizeof_freg
+ .cfi_offset 48, offsetof_freg0 + 16 * sizeof_freg
+ .cfi_offset 49, offsetof_freg0 + 17 * sizeof_freg
+ .cfi_offset 50, offsetof_freg0 + 18 * sizeof_freg
+ .cfi_offset 51, offsetof_freg0 + 19 * sizeof_freg
+ .cfi_offset 52, offsetof_freg0 + 20 * sizeof_freg
+ .cfi_offset 53, offsetof_freg0 + 21 * sizeof_freg
+ .cfi_offset 54, offsetof_freg0 + 22 * sizeof_freg
+ .cfi_offset 55, offsetof_freg0 + 23 * sizeof_freg
+ .cfi_offset 56, offsetof_freg0 + 24 * sizeof_freg
+ .cfi_offset 57, offsetof_freg0 + 25 * sizeof_freg
+ .cfi_offset 58, offsetof_freg0 + 26 * sizeof_freg
+ .cfi_offset 59, offsetof_freg0 + 27 * sizeof_freg
+ .cfi_offset 60, offsetof_freg0 + 28 * sizeof_freg
+ .cfi_offset 61, offsetof_freg0 + 29 * sizeof_freg
+ .cfi_offset 62, offsetof_freg0 + 30 * sizeof_freg
+ .cfi_offset 63, offsetof_freg0 + 31 * sizeof_freg /* f31 */
+
+ nop
+
+__vdso_rt_sigreturn:
+ syscall __NR_rt_sigreturn
+ .cfi_endproc
+
+ .globl __vdso_rt_sigreturn
+ .type __vdso_rt_sigreturn, %function
+ .size __vdso_rt_sigreturn, . - __vdso_rt_sigreturn
diff --git a/linux-user/riscv/vdso.ld b/linux-user/riscv/vdso.ld
new file mode 100644
index 0000000000..57f3159415
--- /dev/null
+++ b/linux-user/riscv/vdso.ld
@@ -0,0 +1,76 @@
+/*
+ * Linker script for linux riscv replacement vdso.
+ *
+ * Copyright 2021 Linaro, Ltd.
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+VERSION {
+ LINUX_4.15 {
+ global:
+ __vdso_rt_sigreturn;
+ __vdso_gettimeofday;
+ __vdso_clock_gettime;
+ __vdso_clock_getres;
+ __vdso_getcpu;
+ __vdso_flush_icache;
+
+ local: *;
+ };
+}
+
+
+PHDRS {
+ phdr PT_PHDR FLAGS(4) PHDRS;
+ data PT_LOAD FLAGS(6) FILEHDR PHDRS;
+ text PT_LOAD FLAGS(5);
+ dynamic PT_DYNAMIC FLAGS(4);
+ eh_frame_hdr PT_GNU_EH_FRAME;
+ note PT_NOTE FLAGS(4);
+}
+
+SECTIONS {
+ /*
+ * We can't prelink to any address without knowing something about
+ * the virtual memory space of the host, since that leaks over into
+ * the available memory space of the guest.
+ */
+ . = 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*) } :data :note
+ .dynamic : { *(.dynamic) } :data :dynamic
+ .dynsym : { *(.dynsym) } :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 : {
+ *(.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) } :data :eh_frame_hdr
+ .eh_frame : { *(.eh_frame) } :data
+
+ . = ALIGN(4096);
+ .text : { *(.text*) } :text =0xd503201f
+}
--
2.25.1
