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Merge tag 'x86_build_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Browse Source 
Pull x86 build updates from Borislav Petkov:

 - Add a "make x86_debug.config" target which enables a bunch of useful
   config debug options when trying to debug an issue

 - A gcc-12 build warnings fix

* tag 'x86_build_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot: Wrap literal addresses in absolute_pointer()
  x86/configs: Add x86 debugging Kconfig fragment plus docs
This commit is contained in:
Linus Torvalds
2022-05-23 18:15:44 -07:00
parent 42b682a30f aeb8441203
commit 1de564b8c1
5 changed files with 58 additions and 13 deletions
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36
arch/x86/boot/boot.h
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@ -77,66 +77,78 @@ typedef unsigned int addr_t;
static inline u8 rdfs8(addr_t addr)
{
u8 *ptr = (u8 *)absolute_pointer(addr);
u8 v;
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr));
return v;
}
static inline u16 rdfs16(addr_t addr)
{
u16 *ptr = (u16 *)absolute_pointer(addr);
u16 v;
asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline u32 rdfs32(addr_t addr)
{
u32 *ptr = (u32 *)absolute_pointer(addr);
u32 v;
asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline void wrfs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
u8 *ptr = (u8 *)absolute_pointer(addr);
asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v));
}
static inline void wrfs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
u16 *ptr = (u16 *)absolute_pointer(addr);
asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline void wrfs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
u32 *ptr = (u32 *)absolute_pointer(addr);
asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline u8 rdgs8(addr_t addr)
{
u8 *ptr = (u8 *)absolute_pointer(addr);
u8 v;
asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr));
return v;
}
static inline u16 rdgs16(addr_t addr)
{
u16 *ptr = (u16 *)absolute_pointer(addr);
u16 v;
asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline u32 rdgs32(addr_t addr)
{
u32 *ptr = (u32 *)absolute_pointer(addr);
u32 v;
asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline void wrgs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
u8 *ptr = (u8 *)absolute_pointer(addr);
asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v));
}
static inline void wrgs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
u16 *ptr = (u16 *)absolute_pointer(addr);
asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline void wrgs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
u32 *ptr = (u32 *)absolute_pointer(addr);
asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
}
/* Note: these only return true/false, not a signed return value! */