Author: ed
Date: Thu Mar 31 18:52:00 2016
New Revision: 297470
URL: https://svnweb.freebsd.org/changeset/base/297470
Log:
Make Position Independent Executables work for CloudABI.
- Set BI_CAN_EXEC_DYN, so we can execute ET_DYN ELF files in addition to
regular ET_EXECs.
- Provide an AT_BASE entry in the auxiliary vector, so the executable
knows at which address it got loaded and can apply relocations.
Modified:
head/sys/amd64/cloudabi64/cloudabi64_sysvec.c
head/sys/arm64/cloudabi64/cloudabi64_sysvec.c
head/sys/compat/cloudabi64/cloudabi64_module.c
Modified: head/sys/amd64/cloudabi64/cloudabi64_sysvec.c
==============================================================================
--- head/sys/amd64/cloudabi64/cloudabi64_sysvec.c Thu Mar 31 18:50:52
2016 (r297469)
+++ head/sys/amd64/cloudabi64/cloudabi64_sysvec.c Thu Mar 31 18:52:00
2016 (r297470)
@@ -156,5 +156,6 @@ Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,
.machine = EM_X86_64,
.sysvec = &cloudabi64_elf_sysvec,
+ .flags = BI_CAN_EXEC_DYN,
.compat_3_brand = "CloudABI",
};
Modified: head/sys/arm64/cloudabi64/cloudabi64_sysvec.c
==============================================================================
--- head/sys/arm64/cloudabi64/cloudabi64_sysvec.c Thu Mar 31 18:50:52
2016 (r297469)
+++ head/sys/arm64/cloudabi64/cloudabi64_sysvec.c Thu Mar 31 18:52:00
2016 (r297470)
@@ -157,5 +157,6 @@ Elf64_Brandinfo cloudabi64_brand = {
.brand = ELFOSABI_CLOUDABI,
.machine = EM_AARCH64,
.sysvec = &cloudabi64_elf_sysvec,
+ .flags = BI_CAN_EXEC_DYN,
.compat_3_brand = "CloudABI",
};
Modified: head/sys/compat/cloudabi64/cloudabi64_module.c
==============================================================================
--- head/sys/compat/cloudabi64/cloudabi64_module.c Thu Mar 31 18:50:52
2016 (r297469)
+++ head/sys/compat/cloudabi64/cloudabi64_module.c Thu Mar 31 18:52:00
2016 (r297470)
@@ -99,6 +99,7 @@ cloudabi64_fixup(register_t **stack_base
#define PTR(type, ptr) { .a_type = (type), .a_ptr = (uintptr_t)(ptr) }
PTR(CLOUDABI_AT_ARGDATA, argdata),
VAL(CLOUDABI_AT_ARGDATALEN, argdatalen),
+ VAL(CLOUDABI_AT_BASE, args->base),
PTR(CLOUDABI_AT_CANARY, canary),
VAL(CLOUDABI_AT_CANARYLEN, sizeof(canarybuf)),
VAL(CLOUDABI_AT_NCPUS, mp_ncpus),
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