exec: Simplify sv_copyout_strings implementations a bit
Simplify control flow around handling of the execpath length and signal trampoline. Cache the sysentvec pointer in a local variable. No functional change intended. Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D33703
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@ -358,17 +358,12 @@ linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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size_t execpath_len;
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struct proc *p;
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/* Calculate string base and vector table pointers. */
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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p = imgp->proc;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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destp = (uintptr_t)arginfo;
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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@ -771,16 +771,11 @@ linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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char canary[LINUX_AT_RANDOM_LEN];
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size_t execpath_len;
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/* Calculate string base and vector table pointers. */
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
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destp = (uintptr_t)arginfo;
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(uint32_t));
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imgp->execpathp = (void *)destp;
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@ -255,17 +255,12 @@ linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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struct proc *p;
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int argc, envc, error;
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/* Calculate string base and vector table pointers. */
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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p = imgp->proc;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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destp = (uintptr_t)arginfo;
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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@ -3391,6 +3391,7 @@ syscall32_helper_unregister(struct syscall_helper_data *sd)
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int
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freebsd32_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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{
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struct sysentvec *sysent;
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int argc, envc, i;
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uint32_t *vectp;
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char *stringp;
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@ -3401,30 +3402,20 @@ freebsd32_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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size_t execpath_len;
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int error, szsigcode;
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/*
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* Calculate string base and vector table pointers.
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* Also deal with signal trampoline code for this exec type.
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*/
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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arginfo = (struct freebsd32_ps_strings *)curproc->p_sysent->
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sv_psstrings;
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sysent = imgp->sysent;
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arginfo = (struct freebsd32_ps_strings *)sysent->sv_psstrings;
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imgp->ps_strings = arginfo;
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if (imgp->proc->p_sysent->sv_sigcode_base == 0)
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szsigcode = *(imgp->proc->p_sysent->sv_szsigcode);
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else
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szsigcode = 0;
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destp = (uintptr_t)arginfo;
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/*
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* install sigcode
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* Install sigcode.
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*/
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if (szsigcode != 0) {
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if (sysent->sv_sigcode_base == 0) {
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szsigcode = *sysent->sv_szsigcode;
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destp -= szsigcode;
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destp = rounddown2(destp, sizeof(uint32_t));
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error = copyout(imgp->proc->p_sysent->sv_sigcode, (void *)destp,
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error = copyout(sysent->sv_sigcode, (void *)destp,
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szsigcode);
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if (error != 0)
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return (error);
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@ -3433,7 +3424,8 @@ freebsd32_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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/*
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* Copy the image path for the rtld.
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*/
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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imgp->execpathp = (void *)destp;
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error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
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@ -289,16 +289,12 @@ linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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size_t execpath_len;
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struct proc *p;
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/* Calculate string base and vector table pointers. */
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p = imgp->proc;
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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destp = (uintptr_t)arginfo;
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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@ -1616,37 +1616,26 @@ exec_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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uintptr_t destp, ustringp;
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struct ps_strings *arginfo;
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struct proc *p;
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struct sysentvec *sysent;
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size_t execpath_len;
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int error, szsigcode, szps;
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int error, szsigcode;
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char canary[sizeof(long) * 8];
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szps = sizeof(pagesizes[0]) * MAXPAGESIZES;
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/*
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* Calculate string base and vector table pointers.
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* Also deal with signal trampoline code for this exec type.
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*/
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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p = imgp->proc;
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szsigcode = 0;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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imgp->ps_strings = arginfo;
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if (p->p_sysent->sv_sigcode_base == 0) {
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if (p->p_sysent->sv_szsigcode != NULL)
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szsigcode = *(p->p_sysent->sv_szsigcode);
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}
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sysent = p->p_sysent;
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arginfo = (struct ps_strings *)sysent->sv_psstrings;
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destp = (uintptr_t)arginfo;
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imgp->ps_strings = arginfo;
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/*
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* install sigcode
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* Install sigcode.
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*/
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if (szsigcode != 0) {
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if (sysent->sv_sigcode_base == 0 && sysent->sv_szsigcode != NULL) {
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szsigcode = *(sysent->sv_szsigcode);
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destp -= szsigcode;
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destp = rounddown2(destp, sizeof(void *));
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error = copyout(p->p_sysent->sv_sigcode, (void *)destp,
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szsigcode);
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error = copyout(sysent->sv_sigcode, (void *)destp, szsigcode);
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if (error != 0)
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return (error);
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}
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@ -1654,7 +1643,8 @@ exec_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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/*
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* Copy the image path for the rtld.
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*/
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if (execpath_len != 0) {
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if (imgp->execpath != NULL && imgp->auxargs != NULL) {
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execpath_len = strlen(imgp->execpath) + 1;
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destp -= execpath_len;
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destp = rounddown2(destp, sizeof(void *));
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imgp->execpathp = (void *)destp;
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@ -1677,13 +1667,13 @@ exec_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
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/*
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* Prepare the pagesizes array.
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*/
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destp -= szps;
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imgp->pagesizeslen = sizeof(pagesizes[0]) * MAXPAGESIZES;
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destp -= imgp->pagesizeslen;
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destp = rounddown2(destp, sizeof(void *));
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imgp->pagesizes = (void *)destp;
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error = copyout(pagesizes, imgp->pagesizes, szps);
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error = copyout(pagesizes, imgp->pagesizes, imgp->pagesizeslen);
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if (error != 0)
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return (error);
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imgp->pagesizeslen = szps;
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/*
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* Allocate room for the argument and environment strings.
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