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-rw-r--r--arch/powerpc/Makefile15
-rw-r--r--arch/powerpc/include/asm/vdso.h12
-rw-r--r--arch/powerpc/kernel/signal_32.c8
-rw-r--r--arch/powerpc/kernel/signal_64.c4
-rw-r--r--arch/powerpc/kernel/vdso32/Makefile8
-rwxr-xr-xarch/powerpc/kernel/vdso32/gen_vdso_offsets.sh16
-rw-r--r--arch/powerpc/kernel/vdso32/vdso32.lds.S6
-rw-r--r--arch/powerpc/kernel/vdso64/Makefile8
-rwxr-xr-xarch/powerpc/kernel/vdso64/gen_vdso_offsets.sh16
-rw-r--r--arch/powerpc/kernel/vdso64/vdso64.lds.S5
-rw-r--r--arch/powerpc/perf/callchain_32.c8
-rw-r--r--arch/powerpc/perf/callchain_64.c4
12 files changed, 98 insertions, 12 deletions
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 86c925bfbb76..fde3dbe57bda 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -409,6 +409,21 @@ install:
archclean:
$(Q)$(MAKE) $(clean)=$(boot)
+ifeq ($(KBUILD_EXTMOD),)
+# We need to generate vdso-offsets.h before compiling certain files in kernel/.
+# In order to do that, we should use the archprepare target, but we can't since
+# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
+# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
+# Therefore we need to generate the header after prepare0 has been made, hence
+# this hack.
+prepare: vdso_prepare
+vdso_prepare: prepare0
+ $(if $(CONFIG_VDSO32),$(Q)$(MAKE) \
+ $(build)=arch/powerpc/kernel/vdso32 include/generated/vdso32-offsets.h)
+ $(if $(CONFIG_PPC64),$(Q)$(MAKE) \
+ $(build)=arch/powerpc/kernel/vdso64 include/generated/vdso64-offsets.h)
+endif
+
archprepare: checkbin
archheaders:
diff --git a/arch/powerpc/include/asm/vdso.h b/arch/powerpc/include/asm/vdso.h
index 2ff884853f97..f5257b7f17d0 100644
--- a/arch/powerpc/include/asm/vdso.h
+++ b/arch/powerpc/include/asm/vdso.h
@@ -15,6 +15,18 @@
#ifndef __ASSEMBLY__
+#ifdef CONFIG_PPC64
+#include <generated/vdso64-offsets.h>
+#endif
+
+#ifdef CONFIG_VDSO32
+#include <generated/vdso32-offsets.h>
+#endif
+
+#define VDSO64_SYMBOL(base, name) ((unsigned long)(base) + (vdso64_offset_##name))
+
+#define VDSO32_SYMBOL(base, name) ((unsigned long)(base) + (vdso32_offset_##name))
+
/* Offsets relative to thread->vdso_base */
extern unsigned long vdso64_rt_sigtramp;
extern unsigned long vdso32_sigtramp;
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index e45aafef4c5b..934cbdf6dd10 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -801,8 +801,8 @@ int handle_rt_signal32(struct ksignal *ksig, sigset_t *oldset,
}
/* Save user registers on the stack */
- if (vdso32_rt_sigtramp && tsk->mm->context.vdso) {
- tramp = (unsigned long)tsk->mm->context.vdso + vdso32_rt_sigtramp;
+ if (tsk->mm->context.vdso) {
+ tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp_rt32);
} else {
tramp = (unsigned long)mctx->mc_pad;
/* Set up the sigreturn trampoline: li r0,sigret; sc */
@@ -901,8 +901,8 @@ int handle_signal32(struct ksignal *ksig, sigset_t *oldset,
else
unsafe_save_user_regs(regs, mctx, tm_mctx, 1, failed);
- if (vdso32_sigtramp && tsk->mm->context.vdso) {
- tramp = (unsigned long)tsk->mm->context.vdso + vdso32_sigtramp;
+ if (tsk->mm->context.vdso) {
+ tramp = VDSO32_SYMBOL(tsk->mm->context.vdso, sigtramp32);
} else {
tramp = (unsigned long)mctx->mc_pad;
/* Set up the sigreturn trampoline: li r0,sigret; sc */
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 68e850bd5ef7..f9e4a1ac440f 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -854,8 +854,8 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
tsk->thread.fp_state.fpscr = 0;
/* Set up to return from userspace. */
- if (vdso64_rt_sigtramp && tsk->mm->context.vdso) {
- regs->nip = (unsigned long)tsk->mm->context.vdso + vdso64_rt_sigtramp;
+ if (tsk->mm->context.vdso) {
+ regs->nip = VDSO64_SYMBOL(tsk->mm->context.vdso, sigtramp_rt64);
} else {
err |= setup_trampoline(__NR_rt_sigreturn, &frame->tramp[0]);
if (err)
diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
index a119d9f84b08..59aa2944ecae 100644
--- a/arch/powerpc/kernel/vdso32/Makefile
+++ b/arch/powerpc/kernel/vdso32/Makefile
@@ -59,6 +59,14 @@ $(obj-vdso32): %.o: %.S FORCE
$(obj)/vgettimeofday.o: %.o: %.c FORCE
$(call if_changed_dep,vdso32cc)
+# 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/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
+ $(call if_changed,vdsosym)
+
# actual build commands
quiet_cmd_vdso32ld_and_check = VDSO32L $@
cmd_vdso32ld_and_check = $(VDSOCC) $(c_flags) $(CC32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^) ; $(cmd_vdso_check)
diff --git a/arch/powerpc/kernel/vdso32/gen_vdso_offsets.sh b/arch/powerpc/kernel/vdso32/gen_vdso_offsets.sh
new file mode 100755
index 000000000000..c7b54a5dcd3e
--- /dev/null
+++ b/arch/powerpc/kernel/vdso32/gen_vdso_offsets.sh
@@ -0,0 +1,16 @@
+#!/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.
+#
+# Author: Will Deacon <will.deacon@arm.com
+#
+
+LC_ALL=C
+sed -n -e 's/^00*/0/' -e \
+'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso32_offset_\2\t0x\1/p'
diff --git a/arch/powerpc/kernel/vdso32/vdso32.lds.S b/arch/powerpc/kernel/vdso32/vdso32.lds.S
index 88a2976e9942..078d75c0cd24 100644
--- a/arch/powerpc/kernel/vdso32/vdso32.lds.S
+++ b/arch/powerpc/kernel/vdso32/vdso32.lds.S
@@ -164,3 +164,9 @@ VERSION
local: *;
};
}
+
+/*
+ * Make the sigreturn code visible to the kernel.
+ */
+VDSO_sigtramp32 = __kernel_sigtramp32;
+VDSO_sigtramp_rt32 = __kernel_sigtramp_rt32;
diff --git a/arch/powerpc/kernel/vdso64/Makefile b/arch/powerpc/kernel/vdso64/Makefile
index 29004ad1b0fb..d365810a689a 100644
--- a/arch/powerpc/kernel/vdso64/Makefile
+++ b/arch/powerpc/kernel/vdso64/Makefile
@@ -42,6 +42,14 @@ $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so.dbg
$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday.o FORCE
$(call if_changed,vdso64ld_and_check)
+# 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.dbg FORCE
+ $(call if_changed,vdsosym)
+
# actual build commands
quiet_cmd_vdso64ld_and_check = VDSO64L $@
cmd_vdso64ld_and_check = $(CC) $(c_flags) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
diff --git a/arch/powerpc/kernel/vdso64/gen_vdso_offsets.sh b/arch/powerpc/kernel/vdso64/gen_vdso_offsets.sh
new file mode 100755
index 000000000000..4bf15ffd5933
--- /dev/null
+++ b/arch/powerpc/kernel/vdso64/gen_vdso_offsets.sh
@@ -0,0 +1,16 @@
+#!/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.
+#
+# Author: Will Deacon <will.deacon@arm.com
+#
+
+LC_ALL=C
+sed -n -e 's/^00*/0/' -e \
+'s/^\([0-9a-fA-F]*\) . VDSO_\([a-zA-Z0-9_]*\)$/\#define vdso64_offset_\2\t0x\1/p'
diff --git a/arch/powerpc/kernel/vdso64/vdso64.lds.S b/arch/powerpc/kernel/vdso64/vdso64.lds.S
index e43731386469..1f06e4f730a8 100644
--- a/arch/powerpc/kernel/vdso64/vdso64.lds.S
+++ b/arch/powerpc/kernel/vdso64/vdso64.lds.S
@@ -159,3 +159,8 @@ VERSION
local: *;
};
}
+
+/*
+ * Make the sigreturn code visible to the kernel.
+ */
+VDSO_sigtramp_rt64 = __kernel_sigtramp_rt64;
diff --git a/arch/powerpc/perf/callchain_32.c b/arch/powerpc/perf/callchain_32.c
index b32e94047fb9..b83c47b7947f 100644
--- a/arch/powerpc/perf/callchain_32.c
+++ b/arch/powerpc/perf/callchain_32.c
@@ -59,8 +59,8 @@ static int is_sigreturn_32_address(unsigned int nip, unsigned int fp)
{
if (nip == fp + offsetof(struct signal_frame_32, mctx.mc_pad))
return 1;
- if (vdso32_sigtramp && current->mm->context.vdso &&
- nip == (unsigned long)current->mm->context.vdso + vdso32_sigtramp)
+ if (current->mm->context.vdso &&
+ nip == VDSO32_SYMBOL(current->mm->context.vdso, sigtramp32))
return 1;
return 0;
}
@@ -70,8 +70,8 @@ static int is_rt_sigreturn_32_address(unsigned int nip, unsigned int fp)
if (nip == fp + offsetof(struct rt_signal_frame_32,
uc.uc_mcontext.mc_pad))
return 1;
- if (vdso32_rt_sigtramp && current->mm->context.vdso &&
- nip == (unsigned long)current->mm->context.vdso + vdso32_rt_sigtramp)
+ if (current->mm->context.vdso &&
+ nip == VDSO32_SYMBOL(current->mm->context.vdso, sigtramp_rt32))
return 1;
return 0;
}
diff --git a/arch/powerpc/perf/callchain_64.c b/arch/powerpc/perf/callchain_64.c
index 6b9c06058c33..8d0df4226328 100644
--- a/arch/powerpc/perf/callchain_64.c
+++ b/arch/powerpc/perf/callchain_64.c
@@ -68,8 +68,8 @@ static int is_sigreturn_64_address(unsigned long nip, unsigned long fp)
{
if (nip == fp + offsetof(struct signal_frame_64, tramp))
return 1;
- if (vdso64_rt_sigtramp && current->mm->context.vdso &&
- nip == (unsigned long)current->mm->context.vdso + vdso64_rt_sigtramp)
+ if (current->mm->context.vdso &&
+ nip == VDSO64_SYMBOL(current->mm->context.vdso, sigtramp_rt64))
return 1;
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.