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/390: Add runtime check for the highgprs kernel feature.

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This commit is contained in:
Andreas Krebbel 2010-01-15 09:10:44 -08:00 committed by Ulrich Drepper
parent 3a56ea2673
commit 7760ccced8
3 changed files with 95 additions and 0 deletions
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6
elf/elf.h
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@ -2493,6 +2493,12 @@ typedef Elf32_Addr Elf32_Conflict;
/* Keep this the last entry. */
#define R_SH_NUM 256
/* S/390 specific definitions. */
/* Valid values for the e_flags field. */
#define EF_S390_HIGH_GPRS 0x00000001 /* High GPRs kernel facility needed. */
/* Additional s390 relocs */
#define R_390_NONE 0 /* No reloc. */

7
sysdeps/s390/s390-32/dl-machine.h
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@ -27,6 +27,7 @@
#include <sys/param.h>
#include <string.h>
#include <link.h>
#include <sysdeps/s390/dl-procinfo.h>
/* This is an older, now obsolete value. */
#define EM_S390_OLD 0xA390
@ -35,6 +36,12 @@
static inline int
elf_machine_matches_host (const Elf32_Ehdr *ehdr)
{
/* Check if the kernel provides the high gpr facility if needed by
the binary. */
if ((ehdr->e_flags & EF_S390_HIGH_GPRS)
&& !(GLRO (dl_hwcap) & HWCAP_S390_HIGH_GPRS))
return 0;
return (ehdr->e_machine == EM_S390 || ehdr->e_machine == EM_S390_OLD)
&& ehdr->e_ident[EI_CLASS] == ELFCLASS32;
}

82
sysdeps/s390/s390-32/elf/start.S
View File

@ -59,6 +59,88 @@
.globl _start
.type _start,@function
_start:
/* Check if the kernel provides highgprs facility if needed by
the binary. */
lr %r6,%r15
la %r6,4(%r6) /* Skip the argument counter. */
.L11: l %r5,0(%r6) /* Skip the argument vector. */
la %r6,4(%r6)
ltr %r5,%r5
jne .L11
.L12: l %r5,0(%r6) /* Skip the environment vector. */
la %r6,4(%r6)
ltr %r5,%r5
jne .L12
/* Obtain the needed values from the auxiliary vector. */
lhi %r7,16 /* AT_HWCAP */
lhi %r8,3 /* AT_PHDR */
lhi %r9,5 /* AT_PHNUM */
lhi %r2,4 /* AT_PHENT */
.L13: l %r5,0(%r6)
clr %r5,%r7
jne .L15
l %r10,4(%r6) /* r10 = AT_HWCAP value. */
.L15: clr %r5,%r8
jne .L16
l %r11,4(%r6) /* r11 = AT_PHDR value. */
.L16: clr %r5,%r9
jne .L17
l %r12,4(%r6) /* r12 = AT_PHNUM value. */
.L17: clr %r5,%r2
jne .L18
l %r0,4(%r6) /* r0 = AT_PHENT value. */
.L18: ltr %r5,%r5
la %r6,8(%r6)
jnz .L13
/* Locate the ELF header by looking for the first PT_LOAD
segment with a p_offset of zero. */
lr %r4,%r11 /* Backup AT_PHDR. */
lhi %r7,1 /* PT_LOAD id */
lhi %r8,0
.L19: cl %r7,0(%r4) /* p_type == PT_LOAD? */
jne .L20
cl %r8,4(%r4) /* p_offset == 0? */
jne .L20
l %r9,8(%r4) /* r9 = p_vaddr <- ELF header address */
j .L24
.L20: alr %r4,%r0 /* r4 += AT_PHENT value */
brct %r12,.L19
j .+2 /* Trap, there must be such a phdr. */
.L24: lr %r4,%r11 /* Backup AT_PHDR. */
lhi %r2,6 /* PT_PHDR id */
.L23: cl %r2,0(%r4)
jne .L22
l %r3,8(%r4) /* r3 = PT_PHDR p_vaddr */
j .L25
.L22: alr %r4,%r0 /* r4 += AT_PHENT value */
brct %r12,.L23
ltr %r9,%r9 /* Load address == 0? */
jz .L14 /* No checking for PIE without PT_PHDR. */
j .L21
.L25: clr %r3,%r11 /* PT_PHDR p_vaddr == AT_PHDR? */
je .L21
lr %r9,%r11
slr %r9,%r3 /* elf_header_addr = AT_PHDR - PT_PHDR.p_vaddr */
.L21: l %r5,36(%r9) /* Load the e_flags field. */
tml %r5,1
jz .L14 /* Binary does not require highgprs facility. */
tml %r10,512 /* Check the AT_HWCAP value. */
jz 2 /* Trap if no highgprs facility available. */
.L14:
/* Setup pointer to literal pool of _start */
basr %r13,0
.L0: ahi %r13,.Llit-.L0