[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH v3 3/7] plat/kvm: Add preinit_array and init_array sections (x86)
Adds preinit_array and init_array sections with the linker script. Those sections are populated by the compiler/linker with function pointer arrays. Such functions are typically part of initializing the language runtime (e.g., C++) and have to be called early during bootstrapping. However, they can also be used by Unikraft libraries for early initializations (functions with constructor attribute). Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx> --- plat/kvm/memory.c | 22 ++++++++++++++++------ plat/kvm/x86/link64.ld | 18 ++++++++++++++++++ 2 files changed, 34 insertions(+), 6 deletions(-) diff --git a/plat/kvm/memory.c b/plat/kvm/memory.c index 705c6df..d2fd235 100644 --- a/plat/kvm/memory.c +++ b/plat/kvm/memory.c @@ -32,13 +32,13 @@ extern void *_libkvmplat_mem_end; int ukplat_memregion_count(void) { - return 6; + return 7; } int ukplat_memregion_get(int i, struct ukplat_memregion_desc *m) { extern char _text, _etext, _data, _edata, _rodata, _erodata, - __bss_start, _end; + _ctors, _ectors, __bss_start, _end; int ret; UK_ASSERT(m); @@ -64,7 +64,17 @@ int ukplat_memregion_get(int i, struct ukplat_memregion_desc *m) #endif ret = 0; break; - case 2: /* data */ + case 2: /* ctors */ + m->base = &_ctors; + m->len = (size_t) &_ectors - (size_t) &_ctors; + m->flags = (UKPLAT_MEMRF_RESERVED + | UKPLAT_MEMRF_READABLE); +#if UKPLAT_MEMRNAME + m->name = "ctors"; +#endif + ret = 0; + break; + case 3: /* data */ m->base = &_data; m->len = (size_t) &_edata - (size_t) &_data; m->flags = (UKPLAT_MEMRF_RESERVED @@ -75,7 +85,7 @@ int ukplat_memregion_get(int i, struct ukplat_memregion_desc *m) #endif ret = 0; break; - case 3: /* bss */ + case 4: /* bss */ m->base = &__bss_start; m->len = (size_t) &_end - (size_t) &__bss_start; m->flags = (UKPLAT_MEMRF_RESERVED @@ -86,7 +96,7 @@ int ukplat_memregion_get(int i, struct ukplat_memregion_desc *m) #endif ret = 0; break; - case 4: /* heap */ + case 5: /* heap */ m->base = _libkvmplat_heap_start; m->len = (size_t) _libkvmplat_stack_top - (size_t) _libkvmplat_heap_start; @@ -96,7 +106,7 @@ int ukplat_memregion_get(int i, struct ukplat_memregion_desc *m) #endif ret = 0; break; - case 5: /* stack */ + case 6: /* stack */ m->base = _libkvmplat_stack_top; m->len = (size_t) _libkvmplat_mem_end - (size_t) _libkvmplat_stack_top; diff --git a/plat/kvm/x86/link64.ld b/plat/kvm/x86/link64.ld index a9f3ac3..d1bfa73 100644 --- a/plat/kvm/x86/link64.ld +++ b/plat/kvm/x86/link64.ld @@ -50,6 +50,24 @@ SECTIONS } _erodata = .; + /* Constructor tables (read-only) */ + _ctors = .; + .preinit_array : { + . = ALIGN(0x8); + PROVIDE_HIDDEN (__preinit_array_start = .); + KEEP (*(.preinit_array)) + PROVIDE_HIDDEN (__preinit_array_end = .); + } + + .init_array : { + . = ALIGN(0x8); + PROVIDE_HIDDEN (__init_array_start = .); + KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*))) + KEEP (*(.init_array .ctors)) + PROVIDE_HIDDEN (__init_array_end = .); + } + _ectors = .; + /* Read-write data (initialized) */ . = ALIGN(0x1000); _data = .; -- 2.7.4 _______________________________________________ Minios-devel mailing list Minios-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/minios-devel
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