From 8b6d8ffe409b377cc974de9534cf951a74f05590 Mon Sep 17 00:00:00 2001 From: midipix Date: Tue, 13 May 2025 02:53:35 +0000 Subject: ldso: dlsym(): pass the return address to __dlsym() as its third parameter. --- src/ldso/nt32/dlsym.s | 24 ++++++++++++++++++++++++ src/ldso/nt32/dynlink.c | 5 ++--- src/ldso/nt64/dlsym.s | 20 ++++++++++++++++++++ src/ldso/nt64/dynlink.c | 5 ++--- 4 files changed, 48 insertions(+), 6 deletions(-) (limited to 'src') diff --git a/src/ldso/nt32/dlsym.s b/src/ldso/nt32/dlsym.s index e69de29..f9e104d 100644 --- a/src/ldso/nt32/dlsym.s +++ b/src/ldso/nt32/dlsym.s @@ -0,0 +1,24 @@ +############################################################################ +## mmglue: midipix architecture- and target-specific bits for musl libc ## +## Copyright (C) 2013--2025 SysDeer Technologies, LLC ## +## Released under GPLv2 and GPLv3; see COPYING.MMGLUE. ## +############################################################################ + +.text +.global _dlsym + +.def _dlsym; .scl 2; .type 32; .endef + +_dlsym: + movl %esp,%ecx # save stack pointer + push (%ecx) # original return address + push 12(%ecx) # original second argument + push 12(%ecx) # original first argument + call ___dlsym + movl %ecx,%esp # restore stack pointer + + .section .got$_dlsym,"r" + .global __imp__dlsym +__imp__dlsym: + .long _dlsym + .linkonce discard diff --git a/src/ldso/nt32/dynlink.c b/src/ldso/nt32/dynlink.c index eddd8cd..032f679 100644 --- a/src/ldso/nt32/dynlink.c +++ b/src/ldso/nt32/dynlink.c @@ -173,9 +173,9 @@ int __dlinfo(void * dso, int req, void * res) return (__ldso_vtbl->dlinfo(dso,req,res)) ? -1 : 0; } -void *__dlsym(void * restrict p, const char * restrict s) +void *__dlsym(void * restrict p, const char * restrict s, void * restrict a) { - return __ldso_vtbl->dlsym(p,s,0); + return __ldso_vtbl->dlsym(p,s,a); } int dlclose(void *p) @@ -188,6 +188,5 @@ char * dlerror(void) return __ldso_vtbl->dlerror(); } -weak_alias(__dlsym,dlsym); weak_alias(__dladdr,dladdr); weak_alias(__dlinfo,dlinfo); diff --git a/src/ldso/nt64/dlsym.s b/src/ldso/nt64/dlsym.s index e69de29..0677d8c 100644 --- a/src/ldso/nt64/dlsym.s +++ b/src/ldso/nt64/dlsym.s @@ -0,0 +1,20 @@ +############################################################################ +## mmglue: midipix architecture- and target-specific bits for musl libc ## +## Copyright (C) 2013--2025 SysDeer Technologies, LLC ## +## Released under GPLv2 and GPLv3; see COPYING.MMGLUE. ## +############################################################################ + +.text +.global dlsym + +.def dlsym; .scl 2; .type 32; .endef + +dlsym: + movq (%rsp),%r8 # original return address as third parameter + jmp __dlsym + + .section .got$dlsym,"r" + .global __imp_dlsym +__imp_dlsym: + .quad dlsym + .linkonce discard diff --git a/src/ldso/nt64/dynlink.c b/src/ldso/nt64/dynlink.c index eddd8cd..032f679 100644 --- a/src/ldso/nt64/dynlink.c +++ b/src/ldso/nt64/dynlink.c @@ -173,9 +173,9 @@ int __dlinfo(void * dso, int req, void * res) return (__ldso_vtbl->dlinfo(dso,req,res)) ? -1 : 0; } -void *__dlsym(void * restrict p, const char * restrict s) +void *__dlsym(void * restrict p, const char * restrict s, void * restrict a) { - return __ldso_vtbl->dlsym(p,s,0); + return __ldso_vtbl->dlsym(p,s,a); } int dlclose(void *p) @@ -188,6 +188,5 @@ char * dlerror(void) return __ldso_vtbl->dlerror(); } -weak_alias(__dlsym,dlsym); weak_alias(__dladdr,dladdr); weak_alias(__dlinfo,dlinfo); -- cgit v1.2.3