Merge tag 'pull-lu-20250828' of https://gitlab.com/rth7680/qemu into staging

linux-user: do not print IP socket options by default
linux-user: Add strace for rseq
linux-user: Move get_elf_cpu_model to target/elfload.c
linux-user: Move get_elf_hwcap to target/elfload.c
linux-user: Move get_elf_hwcap2 to target/elfload.c
linux-user: Move get_elf_platform to target/elfload.c
linux-user: Move get_elf_base_platform to target/elfload.c
linux-user: Create init_main_thread in target/cpu_loop.c
semihosting: Retrieve stack top from image_info
semihosting: Initialize heap once per process

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# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
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* tag 'pull-lu-20250828' of https://gitlab.com/rth7680/qemu: (46 commits)
  linux-user: do not print IP socket options by default
  linux-user: Add strace for rseq
  linux-user: Remove do_init_main_thread
  linux-user/hexagon: Create init_main_thread
  linux-user/xtensa: Create init_main_thread
  linux-user/hppa: Create init_main_thread
  linux-user/riscv: Create init_main_thread
  linux-user/s390x: Create init_main_thread
  linux-user/alpha: Create init_main_thread
  linux-user/m68k: Create init_main_thread
  linux-user/sh4: Create init_main_thread
  linux-user/openrisc: Create init_main_thread
  linux-user/microblaze: Create init_main_thread
  linux-user/mips: Create init_main_thread
  linux-user/loongarch64: Create init_main_thread
  linux-user/ppc: Create init_main_thread
  linux-user/sparc: Create init_main_thread
  linux-user/aarch64: Create init_main_thread
  linux-user/arm: Remove a.out startup remenents
  linux-user/arm: Create init_main_thread
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 22 insertions, 26 deletions

diff --git a/linux-user/i386/cpu_loop.c b/linux-user/i386/cpu_loop.c
index d96d5553fa..7b2d8b03d8 100644
--- a/linux-user/i386/cpu_loop.c
+++ b/linux-user/i386/cpu_loop.c
@@ -331,11 +331,10 @@ static void target_cpu_free(void *obj)
     g_free(obj);
 }
 
-void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
+void init_main_thread(CPUState *cpu, struct image_info *info)
 {
-    CPUState *cpu = env_cpu(env);
+    CPUArchState *env = cpu_env(cpu);
     bool is64 = (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) != 0;
-    int i;
 
     OBJECT(cpu)->free = target_cpu_free;
     env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
@@ -361,28 +360,25 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
     /* flags setup : we activate the IRQs by default as in user mode */
     env->eflags |= IF_MASK;
 
-    /* linux register setup */
-#ifndef TARGET_ABI32
-    env->regs[R_EAX] = regs->rax;
-    env->regs[R_EBX] = regs->rbx;
-    env->regs[R_ECX] = regs->rcx;
-    env->regs[R_EDX] = regs->rdx;
-    env->regs[R_ESI] = regs->rsi;
-    env->regs[R_EDI] = regs->rdi;
-    env->regs[R_EBP] = regs->rbp;
-    env->regs[R_ESP] = regs->rsp;
-    env->eip = regs->rip;
-#else
-    env->regs[R_EAX] = regs->eax;
-    env->regs[R_EBX] = regs->ebx;
-    env->regs[R_ECX] = regs->ecx;
-    env->regs[R_EDX] = regs->edx;
-    env->regs[R_ESI] = regs->esi;
-    env->regs[R_EDI] = regs->edi;
-    env->regs[R_EBP] = regs->ebp;
-    env->regs[R_ESP] = regs->esp;
-    env->eip = regs->eip;
-#endif
+    /*
+     * Linux register setup.
+     *
+     * SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
+     * starts %edx contains a pointer to a function which might be
+     * registered using `atexit'.  This provides a mean for the
+     * dynamic linker to call DT_FINI functions for shared libraries
+     * that have been loaded before the code runs.
+     * A value of 0 tells we have no such handler.
+     *
+     * This applies to x86_64 as well as i386.
+     *
+     * That said, the kernel's ELF_PLAT_INIT simply zeros all of the general
+     * registers.  Note that x86_cpu_reset_hold will set %edx to cpuid_version;
+     * clear all general registers defensively.
+     */
+    memset(env->regs, 0, sizeof(env->regs));
+    env->regs[R_ESP] = info->start_stack;
+    env->eip = info->entry;
 
     /* linux interrupt setup */
 #ifndef TARGET_ABI32
@@ -394,7 +390,7 @@ void target_cpu_copy_regs(CPUArchState *env, target_pt_regs *regs)
                                 PROT_READ|PROT_WRITE,
                                 MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
     idt_table = g2h_untagged(env->idt.base);
-    for (i = 0; i < 20; i++) {
+    for (int i = 0; i < 20; i++) {
         set_idt(i, 0, is64);
     }
     set_idt(3, 3, is64);