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WSL2-Linux-Kernel
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powerpc/vdso: Remove runtime generated sigtramp offsets 

Signal trampoline offsets are now generated at buildtime.

Runtime generated offsets are not used anymore, remove them.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7c192d35a437151837cf4c48aeccb42380d6daac.1601197618.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-09-27 09:16:38 +00:00 коммит произвёл Michael Ellerman
Родитель 49bf59fd03
Коммит 899367ea50
2 изменённых файлов: 0 добавлений и 64 удалений
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5
arch/powerpc/include/asm/vdso.h
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@ -27,11 +27,6 @@
#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;
extern unsigned long vdso32_rt_sigtramp;
int vdso_getcpu_init(void);
#else /* __ASSEMBLY__ */

59
arch/powerpc/kernel/vdso.c
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@ -48,15 +48,10 @@
#define VDSO_ALIGNMENT (1 << 16)
static void *vdso32_kbase;
unsigned long vdso32_sigtramp;
unsigned long vdso32_rt_sigtramp;
extern char vdso32_start, vdso32_end;
extern char vdso64_start, vdso64_end;
static void *vdso64_kbase = &vdso64_start;
#ifdef CONFIG_PPC64
unsigned long vdso64_rt_sigtramp;
#endif /* CONFIG_PPC64 */
static int vdso_ready;
@ -275,22 +270,6 @@ static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
return NULL;
}
/* Note that we assume the section is .text and the symbol is relative to
* the library base
*/
static unsigned long __init find_function32(struct lib32_elfinfo *lib,
const char *symname)
{
Elf32_Sym *sym = find_symbol32(lib, symname);
if (sym == NULL) {
printk(KERN_WARNING "vDSO32: function %s not found !\n",
symname);
return 0;
}
return sym->st_value - VDSO32_LBASE;
}
static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64,
const char *orig, const char *fix)
@ -320,12 +299,6 @@ static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
return 0;
}
#else /* !CONFIG_VDSO32 */
static unsigned long __init find_function32(struct lib32_elfinfo *lib,
const char *symname)
{
return 0;
}
static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64,
const char *orig, const char *fix)
@ -381,22 +354,6 @@ static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
return NULL;
}
/* Note that we assume the section is .text and the symbol is relative to
* the library base
*/
static unsigned long __init find_function64(struct lib64_elfinfo *lib,
const char *symname)
{
Elf64_Sym *sym = find_symbol64(lib, symname);
if (sym == NULL) {
printk(KERN_WARNING "vDSO64: function %s not found !\n",
symname);
return 0;
}
return sym->st_value - VDSO64_LBASE;
}
static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64,
const char *orig, const char *fix)
@ -477,20 +434,6 @@ static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
return 0;
}
static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
/*
* Find signal trampolines
*/
#ifdef CONFIG_PPC64
vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
#endif
vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32");
vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
}
static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
struct lib64_elfinfo *v64)
{
@ -562,8 +505,6 @@ static __init int vdso_setup(void)
if (vdso_fixup_alt_funcs(&v32, &v64))
return -1;
vdso_setup_trampolines(&v32, &v64);
return 0;
}