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51 lines
2.3 KiB
Diff
51 lines
2.3 KiB
Diff
From 3e83f89990e356b02b227cd883d32ccafa283127 Mon Sep 17 00:00:00 2001
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From: Simon Shields <simon.shields@data61.csiro.au>
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Date: Tue, 17 Sep 2019 11:54:22 +1000
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Subject: [PATCH] x86: avoid -Waddress-of-packed-member
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It's safe to take the address of this member, since it's the
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first thing in a cacheline-aligned struct.
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---
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include/arch/x86/arch/32/mode/stack.h | 7 ++++++-
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src/arch/x86/kernel/vspace.c | 9 +++++++--
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2 files changed, 13 insertions(+), 3 deletions(-)
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diff --git a/include/arch/x86/arch/32/mode/stack.h b/include/arch/x86/arch/32/mode/stack.h
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index 93304b96fa..e8e7f1c254 100644
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--- src/kernel/sel4/include/arch/x86/arch/32/mode/stack.h
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+++ src/kernel/sel4/include/arch/x86/arch/32/mode/stack.h
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@@ -45,7 +45,12 @@ static inline void setKernelEntryStackPointer(tcb_t *target_thread)
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/* The first item to be pushed onto the stack should always be SS */
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register_context_top = (word_t)&target_thread->tcbArch.tcbContext.registers[SS + 1];
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- tss_ptr_set_esp0(&x86KSGlobalState[CURRENT_CPU_INDEX()].x86KStss.tss, register_context_top);
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+ /*
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+ * Work around -Waddress-of-packed-member. TSS is the first thing
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+ * in the struct and so it's safe to take its address.
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+ */
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+ void *tss = &x86KSGlobalState[CURRENT_CPU_INDEX()].x86KStss.tss;
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+ tss_ptr_set_esp0(tss, register_context_top);
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if (config_set(CONFIG_HARDWARE_DEBUG_API)) {
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x86_wrmsr(IA32_SYSENTER_ESP_MSR, register_context_top);
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diff --git a/src/arch/x86/kernel/vspace.c b/src/arch/x86/kernel/vspace.c
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index 0ff6d30fff..be9d5f6266 100644
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--- src/kernel/sel4/src/arch/x86/kernel/vspace.c
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+++ src/kernel/sel4/src/arch/x86/kernel/vspace.c
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@@ -493,8 +493,13 @@ BOOT_CODE bool_t init_vm_state(void)
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SMP_COND_STATEMENT(return false);
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}
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- init_tss(&x86KSGlobalState[CURRENT_CPU_INDEX()].x86KStss.tss);
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- init_gdt(x86KSGlobalState[CURRENT_CPU_INDEX()].x86KSgdt, &x86KSGlobalState[CURRENT_CPU_INDEX()].x86KStss.tss);
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+ /*
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+ * Work around -Waddress-of-packed-member. TSS is the first thing
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+ * in the struct and so it's safe to take its address.
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+ */
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+ void *tss_ptr = &x86KSGlobalState[CURRENT_CPU_INDEX()].x86KStss.tss;
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+ init_tss(tss_ptr);
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+ init_gdt(x86KSGlobalState[CURRENT_CPU_INDEX()].x86KSgdt, tss_ptr);
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init_idt(x86KSGlobalState[CURRENT_CPU_INDEX()].x86KSidt);
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return true;
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}
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